From fbaf0bb26397aa498eb9156f06d5a6fe34dd7dd8 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Fri, 19 Apr 2024 03:14:29 +0200
Subject: Merging upstream version 125.0.1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 .../2d.drawImage.detachedcanvas.html               |  28 +
 ...nvasFilterObject.blur.exceptions.tentative.html |  22 +-
 ...r.canvasFilterObject.colorMatrix.tentative.html |  69 +-
 ...ponentTransfer.discrete.tentative-expected.html |  50 ++
 ...bject.componentTransfer.discrete.tentative.html |  49 +-
 ...componentTransfer.gamma.tentative-expected.html |  44 ++
 ...erObject.componentTransfer.gamma.tentative.html |  49 +-
 ...ponentTransfer.identity.tentative-expected.html |  27 +
 ...bject.componentTransfer.identity.tentative.html |  31 +-
 ...omponentTransfer.linear.tentative-expected.html |  43 ++
 ...rObject.componentTransfer.linear.tentative.html |  40 +-
 ...componentTransfer.table.tentative-expected.html |  51 ++
 ...erObject.componentTransfer.table.tentative.html |  49 +-
 ...Object.convolveMatrix.exceptions.tentative.html |  48 +-
 ...lterObject.dropShadow.exceptions.tentative.html | 320 +++++++---
 ...er.canvasFilterObject.dropShadow.tentative.html |  56 +-
 ....gaussianBlur.isotropic.tentative-expected.html |  15 +
 ...terObject.gaussianBlur.isotropic.tentative.html |  20 +
 ...t.gaussianBlur.mostly-x.tentative-expected.html |  15 +
 ...lterObject.gaussianBlur.mostly-x.tentative.html |  20 +
 ...t.gaussianBlur.mostly-y.tentative-expected.html |  15 +
 ...lterObject.gaussianBlur.mostly-y.tentative.html |  20 +
 ....gaussianBlur.tentative.isotropic-expected.html |  15 -
 ...terObject.gaussianBlur.tentative.isotropic.html |  20 -
 ...t.gaussianBlur.tentative.mostly-x-expected.html |  15 -
 ...lterObject.gaussianBlur.tentative.mostly-x.html |  20 -
 ...t.gaussianBlur.tentative.mostly-y-expected.html |  15 -
 ...lterObject.gaussianBlur.tentative.mostly-y.html |  20 -
 ...ect.gaussianBlur.tentative.x-only-expected.html |  15 -
 ...FilterObject.gaussianBlur.tentative.x-only.html |  20 -
 ...ect.gaussianBlur.tentative.y-only-expected.html |  15 -
 ...FilterObject.gaussianBlur.tentative.y-only.html |  20 -
 ...ect.gaussianBlur.x-only.tentative-expected.html |  15 +
 ...FilterObject.gaussianBlur.x-only.tentative.html |  20 +
 ...ect.gaussianBlur.y-only.tentative-expected.html |  15 +
 ...FilterObject.gaussianBlur.y-only.tentative.html |  20 +
 ...lterObject.turbulence.inputTypes.tentative.html |   4 +-
 .../filters/2d.filter.layers.blur.exceptions.html  |  37 ++
 .../filters/2d.filter.layers.colorMatrix.html      | 104 +++
 ...layers.componentTransfer.discrete-expected.html |  50 ++
 ...d.filter.layers.componentTransfer.discrete.html |  38 ++
 ...er.layers.componentTransfer.gamma-expected.html |  44 ++
 .../2d.filter.layers.componentTransfer.gamma.html  |  41 ++
 ...layers.componentTransfer.identity-expected.html |  27 +
 ...d.filter.layers.componentTransfer.identity.html |  34 +
 ...r.layers.componentTransfer.linear-expected.html |  44 ++
 .../2d.filter.layers.componentTransfer.linear.html |  37 ++
 ...er.layers.componentTransfer.table-expected.html |  51 ++
 .../2d.filter.layers.componentTransfer.table.html  |  38 ++
 ...2d.filter.layers.convolveMatrix.exceptions.html |  60 ++
 .../2d.filter.layers.dropShadow-expected.html      |  57 ++
 .../2d.filter.layers.dropShadow.exceptions.html    | 269 ++++++++
 .../filters/2d.filter.layers.dropShadow.html       |  94 +++
 ...ter.layers.gaussianBlur.isotropic-expected.html |  15 +
 .../2d.filter.layers.gaussianBlur.isotropic.html   |  21 +
 ...lter.layers.gaussianBlur.mostly-x-expected.html |  15 +
 .../2d.filter.layers.gaussianBlur.mostly-x.html    |  21 +
 ...lter.layers.gaussianBlur.mostly-y-expected.html |  15 +
 .../2d.filter.layers.gaussianBlur.mostly-y.html    |  21 +
 ...filter.layers.gaussianBlur.x-only-expected.html |  15 +
 .../2d.filter.layers.gaussianBlur.x-only.html      |  21 +
 ...filter.layers.gaussianBlur.y-only-expected.html |  15 +
 .../2d.filter.layers.gaussianBlur.y-only.html      |  21 +
 .../2d.filter.layers.turbulence.inputTypes.html    | 130 ++++
 .../layers/2d.layer.ctm.filter-expected.html       |  25 +
 .../canvas/element/layers/2d.layer.ctm.filter.html |  29 +
 .../element/layers/2d.layer.ctm.getTransform.html  |  31 +
 .../2d.layer.ctm.resetTransform-expected.html      |  19 +
 .../layers/2d.layer.ctm.resetTransform.html        |  28 +
 .../layers/2d.layer.ctm.setTransform-expected.html |  20 +
 .../element/layers/2d.layer.ctm.setTransform.html  |  28 +
 ...r.ctm.shadow-in-transformed-layer-expected.html |  27 +
 .../2d.layer.ctm.shadow-in-transformed-layer.html  |  31 +
 .../layers/2d.layer.drawImage-expected.html        |  29 +
 .../canvas/element/layers/2d.layer.drawImage.html  |  33 +
 ....layer.global-states.filter.alpha.blending.html |   1 +
 ...layer.global-states.filter.alpha.composite.html |   1 +
 .../2d.layer.global-states.filter.alpha.html       |   1 +
 ...2d.layer.global-states.filter.alpha.shadow.html |   1 +
 .../canvas-filter-object-turbulence-expected.html  |  16 +-
 .../tentative/canvas-filter-object-turbulence.html |  14 +-
 ...nvasFilterObject.blur.exceptions.tentative.html |  22 +-
 ...ilterObject.blur.exceptions.tentative.worker.js |  22 +-
 ...r.canvasFilterObject.colorMatrix.tentative.html |  69 +-
 ...vasFilterObject.colorMatrix.tentative.worker.js |  69 +-
 ...ponentTransfer.discrete.tentative-expected.html |  50 ++
 ...bject.componentTransfer.discrete.tentative.html |  53 +-
 ...ect.componentTransfer.discrete.tentative.w.html |  54 ++
 ....componentTransfer.discrete.tentative.worker.js |  62 --
 ...componentTransfer.gamma.tentative-expected.html |  44 ++
 ...erObject.componentTransfer.gamma.tentative.html |  53 +-
 ...Object.componentTransfer.gamma.tentative.w.html |  57 ++
 ...ect.componentTransfer.gamma.tentative.worker.js |  53 --
 ...ponentTransfer.identity.tentative-expected.html |  27 +
 ...bject.componentTransfer.identity.tentative.html |  35 +-
 ...ect.componentTransfer.identity.tentative.w.html |  50 ++
 ....componentTransfer.identity.tentative.worker.js |  40 --
 ...omponentTransfer.linear.tentative-expected.html |  43 ++
 ...rObject.componentTransfer.linear.tentative.html |  44 +-
 ...bject.componentTransfer.linear.tentative.w.html |  53 ++
 ...ct.componentTransfer.linear.tentative.worker.js |  52 --
 ...componentTransfer.table.tentative-expected.html |  51 ++
 ...erObject.componentTransfer.table.tentative.html |  53 +-
 ...Object.componentTransfer.table.tentative.w.html |  54 ++
 ...ect.componentTransfer.table.tentative.worker.js |  62 --
 ...Object.convolveMatrix.exceptions.tentative.html |  48 +-
 ...t.convolveMatrix.exceptions.tentative.worker.js |  48 +-
 ...lterObject.dropShadow.exceptions.tentative.html | 320 +++++++---
 ...bject.dropShadow.exceptions.tentative.worker.js | 320 +++++++---
 ...er.canvasFilterObject.dropShadow.tentative.html |  56 +-
 ....canvasFilterObject.dropShadow.tentative.w.html |  56 +-
 ....gaussianBlur.isotropic.tentative-expected.html |  15 +
 ...terObject.gaussianBlur.isotropic.tentative.html |  23 +
 ...rObject.gaussianBlur.isotropic.tentative.w.html |  37 ++
 ...t.gaussianBlur.mostly-x.tentative-expected.html |  15 +
 ...lterObject.gaussianBlur.mostly-x.tentative.html |  23 +
 ...erObject.gaussianBlur.mostly-x.tentative.w.html |  37 ++
 ...t.gaussianBlur.mostly-y.tentative-expected.html |  15 +
 ...lterObject.gaussianBlur.mostly-y.tentative.html |  23 +
 ...erObject.gaussianBlur.mostly-y.tentative.w.html |  37 ++
 ....gaussianBlur.tentative.isotropic-expected.html |  15 -
 ...terObject.gaussianBlur.tentative.isotropic.html |  23 -
 ...rObject.gaussianBlur.tentative.isotropic.w.html |  37 --
 ...t.gaussianBlur.tentative.mostly-x-expected.html |  15 -
 ...lterObject.gaussianBlur.tentative.mostly-x.html |  23 -
 ...erObject.gaussianBlur.tentative.mostly-x.w.html |  37 --
 ...t.gaussianBlur.tentative.mostly-y-expected.html |  15 -
 ...lterObject.gaussianBlur.tentative.mostly-y.html |  23 -
 ...erObject.gaussianBlur.tentative.mostly-y.w.html |  37 --
 ...ect.gaussianBlur.tentative.x-only-expected.html |  15 -
 ...FilterObject.gaussianBlur.tentative.x-only.html |  23 -
 ...lterObject.gaussianBlur.tentative.x-only.w.html |  37 --
 ...ect.gaussianBlur.tentative.y-only-expected.html |  15 -
 ...FilterObject.gaussianBlur.tentative.y-only.html |  23 -
 ...lterObject.gaussianBlur.tentative.y-only.w.html |  37 --
 ...ect.gaussianBlur.x-only.tentative-expected.html |  15 +
 ...FilterObject.gaussianBlur.x-only.tentative.html |  23 +
 ...lterObject.gaussianBlur.x-only.tentative.w.html |  37 ++
 ...ect.gaussianBlur.y-only.tentative-expected.html |  15 +
 ...FilterObject.gaussianBlur.y-only.tentative.html |  23 +
 ...lterObject.gaussianBlur.y-only.tentative.w.html |  37 ++
 ...lterObject.turbulence.inputTypes.tentative.html |   4 +-
 ...bject.turbulence.inputTypes.tentative.worker.js |   4 +-
 .../filters/2d.filter.layers.blur.exceptions.html  |  38 ++
 .../2d.filter.layers.blur.exceptions.worker.js     |  33 +
 .../filters/2d.filter.layers.colorMatrix.html      | 105 +++
 .../filters/2d.filter.layers.colorMatrix.worker.js | 100 +++
 ...layers.componentTransfer.discrete-expected.html |  50 ++
 ...d.filter.layers.componentTransfer.discrete.html |  41 ++
 ...filter.layers.componentTransfer.discrete.w.html |  55 ++
 ...er.layers.componentTransfer.gamma-expected.html |  44 ++
 .../2d.filter.layers.componentTransfer.gamma.html  |  44 ++
 ...2d.filter.layers.componentTransfer.gamma.w.html |  58 ++
 ...layers.componentTransfer.identity-expected.html |  27 +
 ...d.filter.layers.componentTransfer.identity.html |  37 ++
 ...filter.layers.componentTransfer.identity.w.html |  51 ++
 ...r.layers.componentTransfer.linear-expected.html |  44 ++
 .../2d.filter.layers.componentTransfer.linear.html |  40 ++
 ...d.filter.layers.componentTransfer.linear.w.html |  54 ++
 ...er.layers.componentTransfer.table-expected.html |  51 ++
 .../2d.filter.layers.componentTransfer.table.html  |  41 ++
 ...2d.filter.layers.componentTransfer.table.w.html |  55 ++
 ...2d.filter.layers.convolveMatrix.exceptions.html |  61 ++
 ...lter.layers.convolveMatrix.exceptions.worker.js |  56 ++
 .../2d.filter.layers.dropShadow-expected.html      |  57 ++
 .../2d.filter.layers.dropShadow.exceptions.html    | 270 ++++++++
 ...d.filter.layers.dropShadow.exceptions.worker.js | 265 ++++++++
 .../filters/2d.filter.layers.dropShadow.html       |  97 +++
 .../filters/2d.filter.layers.dropShadow.w.html     | 111 ++++
 ...ter.layers.gaussianBlur.isotropic-expected.html |  15 +
 .../2d.filter.layers.gaussianBlur.isotropic.html   |  24 +
 .../2d.filter.layers.gaussianBlur.isotropic.w.html |  38 ++
 ...lter.layers.gaussianBlur.mostly-x-expected.html |  15 +
 .../2d.filter.layers.gaussianBlur.mostly-x.html    |  24 +
 .../2d.filter.layers.gaussianBlur.mostly-x.w.html  |  38 ++
 ...lter.layers.gaussianBlur.mostly-y-expected.html |  15 +
 .../2d.filter.layers.gaussianBlur.mostly-y.html    |  24 +
 .../2d.filter.layers.gaussianBlur.mostly-y.w.html  |  38 ++
 ...filter.layers.gaussianBlur.x-only-expected.html |  15 +
 .../2d.filter.layers.gaussianBlur.x-only.html      |  24 +
 .../2d.filter.layers.gaussianBlur.x-only.w.html    |  38 ++
 ...filter.layers.gaussianBlur.y-only-expected.html |  15 +
 .../2d.filter.layers.gaussianBlur.y-only.html      |  24 +
 .../2d.filter.layers.gaussianBlur.y-only.w.html    |  38 ++
 .../2d.filter.layers.turbulence.inputTypes.html    | 131 ++++
 ...d.filter.layers.turbulence.inputTypes.worker.js | 126 ++++
 .../layers/2d.layer.ctm.filter-expected.html       |  25 +
 .../offscreen/layers/2d.layer.ctm.filter.html      |  32 +
 .../offscreen/layers/2d.layer.ctm.filter.w.html    |  46 ++
 .../layers/2d.layer.ctm.getTransform.html          |  32 +
 .../layers/2d.layer.ctm.getTransform.worker.js     |  27 +
 .../2d.layer.ctm.resetTransform-expected.html      |  19 +
 .../layers/2d.layer.ctm.resetTransform.html        |  31 +
 .../layers/2d.layer.ctm.resetTransform.w.html      |  45 ++
 .../layers/2d.layer.ctm.setTransform-expected.html |  20 +
 .../layers/2d.layer.ctm.setTransform.html          |  31 +
 .../layers/2d.layer.ctm.setTransform.w.html        |  45 ++
 ...r.ctm.shadow-in-transformed-layer-expected.html |  27 +
 .../2d.layer.ctm.shadow-in-transformed-layer.html  |  34 +
 ...2d.layer.ctm.shadow-in-transformed-layer.w.html |  48 ++
 .../layers/2d.layer.drawImage-expected.html        |  29 +
 .../offscreen/layers/2d.layer.drawImage.html       |  36 ++
 .../offscreen/layers/2d.layer.drawImage.w.html     |  50 ++
 ....layer.global-states.filter.alpha.blending.html |   1 +
 ...ayer.global-states.filter.alpha.blending.w.html |   1 +
 ...layer.global-states.filter.alpha.composite.html |   1 +
 ...yer.global-states.filter.alpha.composite.w.html |   1 +
 .../2d.layer.global-states.filter.alpha.html       |   1 +
 ...2d.layer.global-states.filter.alpha.shadow.html |   1 +
 ....layer.global-states.filter.alpha.shadow.w.html |   1 +
 .../2d.layer.global-states.filter.alpha.w.html     |   1 +
 .../tests/html/canvas/tools/gentestutilsunion.py   | 213 ++++---
 .../html/canvas/tools/name2dir-offscreen.yaml      |   2 +-
 .../yaml-new/drawing-images-to-the-canvas.yaml     |   8 +
 .../tests/html/canvas/tools/yaml-new/filters.yaml  | 706 +++++++++++++++------
 .../tests/html/canvas/tools/yaml-new/layers.yaml   | 204 +++++-
 216 files changed, 8055 insertions(+), 1967 deletions(-)
 create mode 100644 testing/web-platform/tests/html/canvas/element/drawing-images-to-the-canvas/2d.drawImage.detachedcanvas.html
 create mode 100644 testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.componentTransfer.discrete.tentative-expected.html
 create mode 100644 testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.componentTransfer.gamma.tentative-expected.html
 create mode 100644 testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.componentTransfer.identity.tentative-expected.html
 create mode 100644 testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.componentTransfer.linear.tentative-expected.html
 create mode 100644 testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.componentTransfer.table.tentative-expected.html
 create mode 100644 testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.isotropic.tentative-expected.html
 create mode 100644 testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.isotropic.tentative.html
 create mode 100644 testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.mostly-x.tentative-expected.html
 create mode 100644 testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.mostly-x.tentative.html
 create mode 100644 testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.mostly-y.tentative-expected.html
 create mode 100644 testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.mostly-y.tentative.html
 delete mode 100644 testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.isotropic-expected.html
 delete mode 100644 testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.isotropic.html
 delete mode 100644 testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.mostly-x-expected.html
 delete mode 100644 testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.mostly-x.html
 delete mode 100644 testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.mostly-y-expected.html
 delete mode 100644 testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.mostly-y.html
 delete mode 100644 testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.x-only-expected.html
 delete mode 100644 testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.x-only.html
 delete mode 100644 testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.y-only-expected.html
 delete mode 100644 testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.y-only.html
 create mode 100644 testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.x-only.tentative-expected.html
 create mode 100644 testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.x-only.tentative.html
 create mode 100644 testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.y-only.tentative-expected.html
 create mode 100644 testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.y-only.tentative.html
 create mode 100644 testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.blur.exceptions.html
 create mode 100644 testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.colorMatrix.html
 create mode 100644 testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.componentTransfer.discrete-expected.html
 create mode 100644 testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.componentTransfer.discrete.html
 create mode 100644 testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.componentTransfer.gamma-expected.html
 create mode 100644 testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.componentTransfer.gamma.html
 create mode 100644 testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.componentTransfer.identity-expected.html
 create mode 100644 testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.componentTransfer.identity.html
 create mode 100644 testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.componentTransfer.linear-expected.html
 create mode 100644 testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.componentTransfer.linear.html
 create mode 100644 testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.componentTransfer.table-expected.html
 create mode 100644 testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.componentTransfer.table.html
 create mode 100644 testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.convolveMatrix.exceptions.html
 create mode 100644 testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.dropShadow-expected.html
 create mode 100644 testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.dropShadow.exceptions.html
 create mode 100644 testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.dropShadow.html
 create mode 100644 testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.gaussianBlur.isotropic-expected.html
 create mode 100644 testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.gaussianBlur.isotropic.html
 create mode 100644 testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.gaussianBlur.mostly-x-expected.html
 create mode 100644 testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.gaussianBlur.mostly-x.html
 create mode 100644 testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.gaussianBlur.mostly-y-expected.html
 create mode 100644 testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.gaussianBlur.mostly-y.html
 create mode 100644 testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.gaussianBlur.x-only-expected.html
 create mode 100644 testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.gaussianBlur.x-only.html
 create mode 100644 testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.gaussianBlur.y-only-expected.html
 create mode 100644 testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.gaussianBlur.y-only.html
 create mode 100644 testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.turbulence.inputTypes.html
 create mode 100644 testing/web-platform/tests/html/canvas/element/layers/2d.layer.ctm.filter-expected.html
 create mode 100644 testing/web-platform/tests/html/canvas/element/layers/2d.layer.ctm.filter.html
 create mode 100644 testing/web-platform/tests/html/canvas/element/layers/2d.layer.ctm.getTransform.html
 create mode 100644 testing/web-platform/tests/html/canvas/element/layers/2d.layer.ctm.resetTransform-expected.html
 create mode 100644 testing/web-platform/tests/html/canvas/element/layers/2d.layer.ctm.resetTransform.html
 create mode 100644 testing/web-platform/tests/html/canvas/element/layers/2d.layer.ctm.setTransform-expected.html
 create mode 100644 testing/web-platform/tests/html/canvas/element/layers/2d.layer.ctm.setTransform.html
 create mode 100644 testing/web-platform/tests/html/canvas/element/layers/2d.layer.ctm.shadow-in-transformed-layer-expected.html
 create mode 100644 testing/web-platform/tests/html/canvas/element/layers/2d.layer.ctm.shadow-in-transformed-layer.html
 create mode 100644 testing/web-platform/tests/html/canvas/element/layers/2d.layer.drawImage-expected.html
 create mode 100644 testing/web-platform/tests/html/canvas/element/layers/2d.layer.drawImage.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.discrete.tentative-expected.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.discrete.tentative.w.html
 delete mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.discrete.tentative.worker.js
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.gamma.tentative-expected.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.gamma.tentative.w.html
 delete mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.gamma.tentative.worker.js
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.identity.tentative-expected.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.identity.tentative.w.html
 delete mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.identity.tentative.worker.js
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.linear.tentative-expected.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.linear.tentative.w.html
 delete mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.linear.tentative.worker.js
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.table.tentative-expected.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.table.tentative.w.html
 delete mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.table.tentative.worker.js
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.isotropic.tentative-expected.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.isotropic.tentative.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.isotropic.tentative.w.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.mostly-x.tentative-expected.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.mostly-x.tentative.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.mostly-x.tentative.w.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.mostly-y.tentative-expected.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.mostly-y.tentative.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.mostly-y.tentative.w.html
 delete mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.isotropic-expected.html
 delete mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.isotropic.html
 delete mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.isotropic.w.html
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 delete mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.mostly-x.html
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 delete mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.mostly-y-expected.html
 delete mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.mostly-y.html
 delete mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.mostly-y.w.html
 delete mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.x-only-expected.html
 delete mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.x-only.html
 delete mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.x-only.w.html
 delete mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.y-only-expected.html
 delete mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.y-only.html
 delete mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.y-only.w.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.x-only.tentative-expected.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.x-only.tentative.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.x-only.tentative.w.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.y-only.tentative-expected.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.y-only.tentative.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.y-only.tentative.w.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.blur.exceptions.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.blur.exceptions.worker.js
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.colorMatrix.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.colorMatrix.worker.js
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.componentTransfer.discrete-expected.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.componentTransfer.discrete.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.componentTransfer.discrete.w.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.componentTransfer.gamma-expected.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.componentTransfer.gamma.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.componentTransfer.gamma.w.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.componentTransfer.identity-expected.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.componentTransfer.identity.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.componentTransfer.identity.w.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.componentTransfer.linear-expected.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.componentTransfer.linear.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.componentTransfer.linear.w.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.componentTransfer.table-expected.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.componentTransfer.table.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.componentTransfer.table.w.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.convolveMatrix.exceptions.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.convolveMatrix.exceptions.worker.js
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.dropShadow-expected.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.dropShadow.exceptions.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.dropShadow.exceptions.worker.js
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.dropShadow.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.dropShadow.w.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.gaussianBlur.isotropic-expected.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.gaussianBlur.isotropic.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.gaussianBlur.isotropic.w.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.gaussianBlur.mostly-x-expected.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.gaussianBlur.mostly-x.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.gaussianBlur.mostly-x.w.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.gaussianBlur.mostly-y-expected.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.gaussianBlur.mostly-y.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.gaussianBlur.mostly-y.w.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.gaussianBlur.x-only-expected.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.gaussianBlur.x-only.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.gaussianBlur.x-only.w.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.gaussianBlur.y-only-expected.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.gaussianBlur.y-only.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.gaussianBlur.y-only.w.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.turbulence.inputTypes.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.turbulence.inputTypes.worker.js
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.ctm.filter-expected.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.ctm.filter.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.ctm.filter.w.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.ctm.getTransform.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.ctm.getTransform.worker.js
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.ctm.resetTransform-expected.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.ctm.resetTransform.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.ctm.resetTransform.w.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.ctm.setTransform-expected.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.ctm.setTransform.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.ctm.setTransform.w.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.ctm.shadow-in-transformed-layer-expected.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.ctm.shadow-in-transformed-layer.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.ctm.shadow-in-transformed-layer.w.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.drawImage-expected.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.drawImage.html
 create mode 100644 testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.drawImage.w.html

(limited to 'testing/web-platform/tests/html/canvas')

diff --git a/testing/web-platform/tests/html/canvas/element/drawing-images-to-the-canvas/2d.drawImage.detachedcanvas.html b/testing/web-platform/tests/html/canvas/element/drawing-images-to-the-canvas/2d.drawImage.detachedcanvas.html
new file mode 100644
index 0000000000..e301537330
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/element/drawing-images-to-the-canvas/2d.drawImage.detachedcanvas.html
@@ -0,0 +1,28 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>Canvas test: 2d.drawImage.detachedcanvas</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+<link rel="stylesheet" href="/html/canvas/resources/canvas-tests.css">
+<body class="show_output">
+
+<h1>2d.drawImage.detachedcanvas</h1>
+<p class="desc">drawImage with detached OffscreenCanvas as the source should throw exception</p>
+
+
+<p class="output">Actual output:</p>
+<canvas id="c" class="output" width="100" height="50"><p class="fallback">FAIL (fallback content)</p></canvas>
+
+<ul id="d"></ul>
+<script>
+var t = async_test("drawImage with detached OffscreenCanvas as the source should throw exception");
+_addTest(function(canvas, ctx) {
+
+  var canvas2 = new OffscreenCanvas(80, 80);
+  (new MessageChannel()).port1.postMessage(canvas2, [canvas2]);
+  assert_throws_dom("INVALID_STATE_ERR", function() { ctx.drawImage(canvas2, 0, 0); });
+
+});
+</script>
+
diff --git a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.blur.exceptions.tentative.html b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.blur.exceptions.tentative.html
index 42fb1ee8f8..dc94792867 100644
--- a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.blur.exceptions.tentative.html
+++ b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.blur.exceptions.tentative.html
@@ -8,7 +8,7 @@
 <body class="show_output">
 
 <h1>2d.filter.canvasFilterObject.blur.exceptions.tentative</h1>
-<p class="desc">Test exceptions on CanvasFilter() blur.object</p>
+<p class="desc">Test exceptions on gaussianBlur filter</p>
 
 
 <p class="output">Actual output:</p>
@@ -16,15 +16,21 @@
 
 <ul id="d"></ul>
 <script>
-var t = async_test("Test exceptions on CanvasFilter() blur.object");
+var t = async_test("Test exceptions on gaussianBlur filter");
 _addTest(function(canvas, ctx) {
 
-  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter({name: 'gaussianBlur'}); });
-  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter({name: 'gaussianBlur', stdDeviation: undefined}); });
-  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter({name: 'gaussianBlur', stdDeviation: 'foo'}); });
-  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter({name: 'gaussianBlur', stdDeviation: [1,2,3]}); });
-  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter({name: 'gaussianBlur', stdDeviation: NaN}); });
-  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter({name: 'gaussianBlur', stdDeviation: {}}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'gaussianBlur'}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'gaussianBlur', stdDeviation: undefined}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'gaussianBlur', stdDeviation: 'foo'}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'gaussianBlur', stdDeviation: [1,2,3]}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'gaussianBlur', stdDeviation: NaN}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'gaussianBlur', stdDeviation: {}}); });
 
 });
 </script>
diff --git a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.colorMatrix.tentative.html b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.colorMatrix.tentative.html
index b2f6a6ac97..56cf1bf0b1 100644
--- a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.colorMatrix.tentative.html
+++ b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.colorMatrix.tentative.html
@@ -8,7 +8,7 @@
 <body class="show_output">
 
 <h1>2d.filter.canvasFilterObject.colorMatrix.tentative</h1>
-<p class="desc">Test the functionality of ColorMatrix filters in CanvasFilter objects</p>
+<p class="desc">Test the functionality of ColorMatrix filters</p>
 
 
 <p class="output">Actual output:</p>
@@ -16,41 +16,70 @@
 
 <ul id="d"></ul>
 <script>
-var t = async_test("Test the functionality of ColorMatrix filters in CanvasFilter objects");
+var t = async_test("Test the functionality of ColorMatrix filters");
 _addTest(function(canvas, ctx) {
 
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'colorMatrix', values: undefined}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'colorMatrix', values: 'foo'}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'colorMatrix', values: null}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'colorMatrix', values: [1, 2, 3]}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'colorMatrix', values: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 'a']}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'colorMatrix', values: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, Infinity]}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'colorMatrix', values: undefined}); });
+
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'colorMatrix', values: 'foo'}); });
+
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'colorMatrix', values: null}); });
+
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'colorMatrix', values: [1, 2, 3]}); });
+
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'colorMatrix',
+     values: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18,
+              19, 'a']}); });
+
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'colorMatrix',
+     values: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18,
+              19, Infinity]}); });
+
   ctx.fillStyle = '#f00';
-  ctx.filter = new CanvasFilter({name: 'colorMatrix', type: 'hueRotate', values: 0});
+  ctx.filter = new CanvasFilter(
+    {name: 'colorMatrix', type: 'hueRotate', values: 0});
   ctx.fillRect(0, 0, 100, 50);
   _assertPixelApprox(canvas, 10,10, 255,0,0,255, 2);
-  ctx.filter = new CanvasFilter({name: 'colorMatrix', type: 'hueRotate', values: 90});
+
+  ctx.filter = new CanvasFilter(
+    {name: 'colorMatrix', type: 'hueRotate', values: 90});
   ctx.fillRect(0, 0, 100, 50);
   _assertPixelApprox(canvas, 10,10, 0,91,0,255, 2);
-  ctx.filter = new CanvasFilter({name: 'colorMatrix', type: 'hueRotate', values: 180});
+
+  ctx.filter = new CanvasFilter(
+    {name: 'colorMatrix', type: 'hueRotate', values: 180});
   ctx.fillRect(0, 0, 100, 50);
   _assertPixelApprox(canvas, 10,10, 0,109,109,255, 2);
-  ctx.filter = new CanvasFilter({name: 'colorMatrix', type: 'hueRotate', values: 270});
+
+  ctx.filter = new CanvasFilter(
+    {name: 'colorMatrix', type: 'hueRotate', values: 270});
   ctx.fillRect(0, 0, 100, 50);
   _assertPixelApprox(canvas, 10,10, 109,18,255,255, 2);
-  ctx.filter = new CanvasFilter({name: 'colorMatrix', type: 'saturate', values: 0.5});
+
+  ctx.filter = new CanvasFilter(
+    {name: 'colorMatrix', type: 'saturate', values: 0.5});
   ctx.fillRect(0, 0, 100, 50);
   _assertPixelApprox(canvas, 10,10, 155,27,27,255, 2);
+
   ctx.clearRect(0, 0, 100, 50);
-  ctx.filter = new CanvasFilter({name: 'colorMatrix', type: 'luminanceToAlpha'});
+  ctx.filter = new CanvasFilter(
+    {name: 'colorMatrix', type: 'luminanceToAlpha'});
   ctx.fillRect(0, 0, 100, 50);
   _assertPixelApprox(canvas, 10,10, 0,0,0,54, 2);
-  ctx.filter = new CanvasFilter({name: 'colorMatrix', values: [
-          0, 0, 0, 0, 0,
-          1, 1, 1, 1, 0,
-          0, 0, 0, 0, 0,
-          0, 0, 0, 1, 0
-  ]});
+
+  ctx.filter = new CanvasFilter(
+    {name: 'colorMatrix', values: [
+      0, 0, 0, 0, 0,
+      1, 1, 1, 1, 0,
+      0, 0, 0, 0, 0,
+      0, 0, 0, 1, 0
+    ]});
   ctx.fillRect(0, 0, 50, 25);
   ctx.fillStyle = '#0f0';
   ctx.fillRect(50, 0, 50, 25);
diff --git a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.componentTransfer.discrete.tentative-expected.html b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.componentTransfer.discrete.tentative-expected.html
new file mode 100644
index 0000000000..2b1c1c1c07
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.componentTransfer.discrete.tentative-expected.html
@@ -0,0 +1,50 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>Canvas test: 2d.filter.canvasFilterObject.componentTransfer.discrete.tentative</title>
+<h1>2d.filter.canvasFilterObject.componentTransfer.discrete.tentative</h1>
+<p class="desc">Test pixels on CanvasFilter() componentTransfer with discrete type</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = document.getElementById("canvas");
+  const ctx = canvas.getContext('2d');
+
+  // From https://www.w3.org/TR/SVG11/filters.html#feComponentTransferElement
+  function getTransformedValue(C, V) {
+      // Get the right interval
+      const n = V.length;
+      const k = C == 1 ? n - 1 : Math.floor(C * n);
+      return V[k];
+  }
+
+  function getColor(inputColor, tableValues) {
+      const result = [0, 0, 0];
+      for (const i in inputColor) {
+          const C = inputColor[i]/255;
+          const Cprime = getTransformedValue(C, tableValues[i]);
+          result[i] = Math.max(0, Math.min(1, Cprime)) * 255;
+      }
+      return result;
+  }
+
+  tableValuesR = [0, 0, 1, 1];
+  tableValuesG = [2, 0, 0.5, 3];
+  tableValuesB = [1, -1, 5, 0];
+
+  const inputColors = [
+      [255, 255, 255],
+      [0, 0, 0],
+      [127, 0, 34],
+      [252, 186, 3],
+      [50, 68, 87],
+  ];
+  for (let i = 0 ; i < inputColors.length ; ++i) {
+      const color = inputColors[i];
+      let outputColor = getColor(
+          color, [tableValuesR, tableValuesG, tableValuesB]);
+      ctx.fillStyle = `rgb(${outputColor[0]}, ${outputColor[1]},
+        ${outputColor[2]})`;
+      ctx.fillRect(i * 10, i * 10, 10, 10);
+  }
+</script>
diff --git a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.componentTransfer.discrete.tentative.html b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.componentTransfer.discrete.tentative.html
index b392b189f2..0a4830568b 100644
--- a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.componentTransfer.discrete.tentative.html
+++ b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.componentTransfer.discrete.tentative.html
@@ -1,41 +1,16 @@
 <!DOCTYPE html>
 <!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<link rel="match" href="2d.filter.canvasFilterObject.componentTransfer.discrete.tentative-expected.html">
+<meta name=fuzzy content="maxDifference=0-2; totalPixels=0-500">
 <title>Canvas test: 2d.filter.canvasFilterObject.componentTransfer.discrete.tentative</title>
-<script src="/resources/testharness.js"></script>
-<script src="/resources/testharnessreport.js"></script>
-<script src="/html/canvas/resources/canvas-tests.js"></script>
-<link rel="stylesheet" href="/html/canvas/resources/canvas-tests.css">
-<body class="show_output">
-
 <h1>2d.filter.canvasFilterObject.componentTransfer.discrete.tentative</h1>
 <p class="desc">Test pixels on CanvasFilter() componentTransfer with discrete type</p>
-
-
-<p class="output">Actual output:</p>
-<canvas id="c" class="output" width="100" height="50"><p class="fallback">FAIL (fallback content)</p></canvas>
-
-<ul id="d"></ul>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
 <script>
-var t = async_test("Test pixels on CanvasFilter() componentTransfer with discrete type");
-_addTest(function(canvas, ctx) {
-
-  // From https://www.w3.org/TR/SVG11/filters.html#feComponentTransferElement
-  function getTransformedValue(C, V) {
-      // Get the right interval
-      const n = V.length;
-      const k = C == 1 ? n - 1 : Math.floor(C * n);
-      return V[k];
-  }
-
-  function getColor(inputColor, tableValues) {
-      const result = [0, 0, 0];
-      for (const i in inputColor) {
-          const C = inputColor[i]/255;
-          const Cprime = getTransformedValue(C, tableValues[i]);
-          result[i] = Math.max(0, Math.min(1, Cprime)) * 255;
-      }
-      return result;
-  }
+  const canvas = document.getElementById("canvas");
+  const ctx = canvas.getContext('2d');
 
   tableValuesR = [0, 0, 1, 1];
   tableValuesG = [2, 0, 0.5, 3];
@@ -54,13 +29,9 @@ _addTest(function(canvas, ctx) {
       [50, 68, 87],
   ];
 
-  for (const color of inputColors) {
-      let outputColor = getColor(color, [tableValuesR, tableValuesG, tableValuesB]);
+  for (let i = 0 ; i < inputColors.length ; ++i) {
+      const color = inputColors[i];
       ctx.fillStyle = `rgb(${color[0]}, ${color[1]}, ${color[2]})`;
-      ctx.fillRect(0, 0, 10, 10);
-      _assertPixelApprox(canvas, 5, 5, outputColor[0],outputColor[1],outputColor[2],255, 2);
+      ctx.fillRect(i * 10, i * 10, 10, 10);
   }
-
-});
 </script>
-
diff --git a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.componentTransfer.gamma.tentative-expected.html b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.componentTransfer.gamma.tentative-expected.html
new file mode 100644
index 0000000000..5adc9f53e2
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.componentTransfer.gamma.tentative-expected.html
@@ -0,0 +1,44 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>Canvas test: 2d.filter.canvasFilterObject.componentTransfer.gamma.tentative</title>
+<h1>2d.filter.canvasFilterObject.componentTransfer.gamma.tentative</h1>
+<p class="desc">Test pixels on CanvasFilter() componentTransfer with gamma type</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = document.getElementById("canvas");
+  const ctx = canvas.getContext('2d');
+
+  // From https://www.w3.org/TR/SVG11/filters.html#feComponentTransferElement
+  function getColor(inputColor, amplitude, exponent, offset) {
+      return [
+          Math.max(0, Math.min(1, Math.pow(inputColor[0]/255,
+            exponent[0]) * amplitude[0] + offset[0])) * 255,
+          Math.max(0, Math.min(1, Math.pow(inputColor[1]/255,
+            exponent[1]) * amplitude[1] + offset[1])) * 255,
+          Math.max(0, Math.min(1, Math.pow(inputColor[2]/255,
+            exponent[2]) * amplitude[2] + offset[2])) * 255,
+      ];
+  }
+
+  const amplitudes = [2, 1.1, 0.5];
+  const exponents = [5, 3, 1];
+  const offsets = [0.25, 0, 0.5];
+
+  const inputColors = [
+      [255, 255, 255],
+      [0, 0, 0],
+      [127, 0, 34],
+      [252, 186, 3],
+      [50, 68, 87],
+  ];
+
+  for (let i = 0 ; i < inputColors.length ; ++i) {
+      const color = inputColors[i];
+      let outputColor = getColor(color, amplitudes, exponents, offsets);
+      ctx.fillStyle = `rgb(${outputColor[0]}, ${outputColor[1]},
+        ${outputColor[2]})`;
+      ctx.fillRect(i * 10, i * 10, 10, 10);
+  }
+</script>
diff --git a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.componentTransfer.gamma.tentative.html b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.componentTransfer.gamma.tentative.html
index e5bff7e44d..22e3abe624 100644
--- a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.componentTransfer.gamma.tentative.html
+++ b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.componentTransfer.gamma.tentative.html
@@ -1,40 +1,27 @@
 <!DOCTYPE html>
 <!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<link rel="match" href="2d.filter.canvasFilterObject.componentTransfer.gamma.tentative-expected.html">
+<meta name=fuzzy content="maxDifference=0-2; totalPixels=0-500">
 <title>Canvas test: 2d.filter.canvasFilterObject.componentTransfer.gamma.tentative</title>
-<script src="/resources/testharness.js"></script>
-<script src="/resources/testharnessreport.js"></script>
-<script src="/html/canvas/resources/canvas-tests.js"></script>
-<link rel="stylesheet" href="/html/canvas/resources/canvas-tests.css">
-<body class="show_output">
-
 <h1>2d.filter.canvasFilterObject.componentTransfer.gamma.tentative</h1>
 <p class="desc">Test pixels on CanvasFilter() componentTransfer with gamma type</p>
-
-
-<p class="output">Actual output:</p>
-<canvas id="c" class="output" width="100" height="50"><p class="fallback">FAIL (fallback content)</p></canvas>
-
-<ul id="d"></ul>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
 <script>
-var t = async_test("Test pixels on CanvasFilter() componentTransfer with gamma type");
-_addTest(function(canvas, ctx) {
-
-  // From https://www.w3.org/TR/SVG11/filters.html#feComponentTransferElement
-  function getColor(inputColor, amplitude, exponent, offset) {
-      return [
-          Math.max(0, Math.min(1, Math.pow(inputColor[0]/255, exponent[0]) * amplitude[0] + offset[0])) * 255,
-          Math.max(0, Math.min(1, Math.pow(inputColor[1]/255, exponent[1]) * amplitude[1] + offset[1])) * 255,
-          Math.max(0, Math.min(1, Math.pow(inputColor[2]/255, exponent[2]) * amplitude[2] + offset[2])) * 255,
-      ];
-  }
+  const canvas = document.getElementById("canvas");
+  const ctx = canvas.getContext('2d');
 
   const amplitudes = [2, 1.1, 0.5];
   const exponents = [5, 3, 1];
   const offsets = [0.25, 0, 0.5];
   ctx.filter = new CanvasFilter({name: 'componentTransfer',
-      funcR: {type: 'gamma', amplitude: amplitudes[0], exponent: exponents[0], offset: offsets[0]},
-      funcG: {type: 'gamma', amplitude: amplitudes[1], exponent: exponents[1], offset: offsets[1]},
-      funcB: {type: 'gamma', amplitude: amplitudes[2], exponent: exponents[2], offset: offsets[2]},
+      funcR: {type: 'gamma', amplitude: amplitudes[0],
+        exponent: exponents[0], offset: offsets[0]},
+      funcG: {type: 'gamma', amplitude: amplitudes[1],
+        exponent: exponents[1], offset: offsets[1]},
+      funcB: {type: 'gamma', amplitude: amplitudes[2],
+        exponent: exponents[2], offset: offsets[2]},
   });
 
   const inputColors = [
@@ -45,13 +32,9 @@ _addTest(function(canvas, ctx) {
       [50, 68, 87],
   ];
 
-  for (const color of inputColors) {
-      let outputColor = getColor(color, amplitudes, exponents, offsets);
+  for (let i = 0 ; i < inputColors.length ; ++i) {
+      const color = inputColors[i];
       ctx.fillStyle = `rgb(${color[0]}, ${color[1]}, ${color[2]})`;
-      ctx.fillRect(0, 0, 10, 10);
-      _assertPixelApprox(canvas, 5, 5, outputColor[0],outputColor[1],outputColor[2],255, 2);
+      ctx.fillRect(i * 10, i * 10, 10, 10);
   }
-
-});
 </script>
-
diff --git a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.componentTransfer.identity.tentative-expected.html b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.componentTransfer.identity.tentative-expected.html
new file mode 100644
index 0000000000..895d531206
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.componentTransfer.identity.tentative-expected.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>Canvas test: 2d.filter.canvasFilterObject.componentTransfer.identity.tentative</title>
+<h1>2d.filter.canvasFilterObject.componentTransfer.identity.tentative</h1>
+<p class="desc">Test pixels on CanvasFilter() componentTransfer with identity type</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = document.getElementById("canvas");
+  const ctx = canvas.getContext('2d');
+
+  const inputColors = [
+      [255, 255, 255],
+      [0, 0, 0],
+      [127, 0, 34],
+      [252, 186, 3],
+      [50, 68, 87],
+  ];
+
+  for (let i = 0 ; i < inputColors.length ; ++i) {
+      let outputColor = inputColors[i];
+      ctx.fillStyle = `rgb(${outputColor[0]}, ${outputColor[1]},
+        ${outputColor[2]})`;
+      ctx.fillRect(i * 10, i * 10, 10, 10);
+  }
+</script>
diff --git a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.componentTransfer.identity.tentative.html b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.componentTransfer.identity.tentative.html
index ecd3830be3..17761ce31a 100644
--- a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.componentTransfer.identity.tentative.html
+++ b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.componentTransfer.identity.tentative.html
@@ -1,23 +1,15 @@
 <!DOCTYPE html>
 <!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<link rel="match" href="2d.filter.canvasFilterObject.componentTransfer.identity.tentative-expected.html">
 <title>Canvas test: 2d.filter.canvasFilterObject.componentTransfer.identity.tentative</title>
-<script src="/resources/testharness.js"></script>
-<script src="/resources/testharnessreport.js"></script>
-<script src="/html/canvas/resources/canvas-tests.js"></script>
-<link rel="stylesheet" href="/html/canvas/resources/canvas-tests.css">
-<body class="show_output">
-
 <h1>2d.filter.canvasFilterObject.componentTransfer.identity.tentative</h1>
 <p class="desc">Test pixels on CanvasFilter() componentTransfer with identity type</p>
-
-
-<p class="output">Actual output:</p>
-<canvas id="c" class="output" width="100" height="50"><p class="fallback">FAIL (fallback content)</p></canvas>
-
-<ul id="d"></ul>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
 <script>
-var t = async_test("Test pixels on CanvasFilter() componentTransfer with identity type");
-_addTest(function(canvas, ctx) {
+  const canvas = document.getElementById("canvas");
+  const ctx = canvas.getContext('2d');
 
   ctx.filter = new CanvasFilter({name: 'componentTransfer',
       funcR: {type: 'identity'},
@@ -33,12 +25,9 @@ _addTest(function(canvas, ctx) {
       [50, 68, 87],
   ];
 
-  for (const color of inputColors) {
-      ctx.fillStyle = `rgba(${color[0]}, ${color[1]}, ${color[2]}, 1)`,
-      ctx.fillRect(0, 0, 10, 10);
-      _assertPixel(canvas, 5, 5, color[0],color[1],color[2],255);
+  for (let i = 0 ; i < inputColors.length ; ++i) {
+      const color = inputColors[i];
+      ctx.fillStyle = `rgb(${color[0]}, ${color[1]}, ${color[2]})`;
+      ctx.fillRect(i * 10, i * 10, 10, 10);
   }
-
-});
 </script>
-
diff --git a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.componentTransfer.linear.tentative-expected.html b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.componentTransfer.linear.tentative-expected.html
new file mode 100644
index 0000000000..c4ad790d56
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.componentTransfer.linear.tentative-expected.html
@@ -0,0 +1,43 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>Canvas test: 2d.filter.canvasFilterObject.componentTransfer.linear.tentative</title>
+<h1>2d.filter.canvasFilterObject.componentTransfer.linear.tentative</h1>
+<p class="desc">Test pixels on CanvasFilter() componentTransfer with linear type</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = document.getElementById("canvas");
+  const ctx = canvas.getContext('2d');
+
+  // From https://www.w3.org/TR/SVG11/filters.html#feComponentTransferElement
+  function getColor(inputColor, slopes, intercepts) {
+      return [
+          Math.max(0, Math.min(1,
+            inputColor[0]/255 * slopes[0] + intercepts[0])) * 255,
+          Math.max(0, Math.min(1,
+            inputColor[1]/255 * slopes[1] + intercepts[1])) * 255,
+          Math.max(0, Math.min(1,
+            inputColor[2]/255 * slopes[2] + intercepts[2])) * 255,
+      ];
+  }
+
+  const slopes = [0.5, 1.2, -0.2];
+  const intercepts = [0.25, 0, 0.5];
+
+  const inputColors = [
+      [255, 255, 255],
+      [0, 0, 0],
+      [127, 0, 34],
+      [252, 186, 3],
+      [50, 68, 87],
+  ];
+
+  for (let i = 0 ; i < inputColors.length ; ++i) {
+      const color = inputColors[i];
+      let outputColor = getColor(color, slopes, intercepts);
+      ctx.fillStyle = `rgb(${outputColor[0]}, ${outputColor[1]},
+        ${outputColor[2]})`;
+      ctx.fillRect(i * 10, i * 10, 10, 10);
+  }
+</script>
diff --git a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.componentTransfer.linear.tentative.html b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.componentTransfer.linear.tentative.html
index 8708887f6a..5ea5f8e0e3 100644
--- a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.componentTransfer.linear.tentative.html
+++ b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.componentTransfer.linear.tentative.html
@@ -1,32 +1,16 @@
 <!DOCTYPE html>
 <!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<link rel="match" href="2d.filter.canvasFilterObject.componentTransfer.linear.tentative-expected.html">
+<meta name=fuzzy content="maxDifference=0-2; totalPixels=0-500">
 <title>Canvas test: 2d.filter.canvasFilterObject.componentTransfer.linear.tentative</title>
-<script src="/resources/testharness.js"></script>
-<script src="/resources/testharnessreport.js"></script>
-<script src="/html/canvas/resources/canvas-tests.js"></script>
-<link rel="stylesheet" href="/html/canvas/resources/canvas-tests.css">
-<body class="show_output">
-
 <h1>2d.filter.canvasFilterObject.componentTransfer.linear.tentative</h1>
 <p class="desc">Test pixels on CanvasFilter() componentTransfer with linear type</p>
-
-
-<p class="output">Actual output:</p>
-<canvas id="c" class="output" width="100" height="50"><p class="fallback">FAIL (fallback content)</p></canvas>
-
-<ul id="d"></ul>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
 <script>
-var t = async_test("Test pixels on CanvasFilter() componentTransfer with linear type");
-_addTest(function(canvas, ctx) {
-
-  // From https://www.w3.org/TR/SVG11/filters.html#feComponentTransferElement
-  function getColor(inputColor, slopes, intercepts) {
-      return [
-          Math.max(0, Math.min(1, inputColor[0]/255 * slopes[0] + intercepts[0])) * 255,
-          Math.max(0, Math.min(1, inputColor[1]/255 * slopes[1] + intercepts[1])) * 255,
-          Math.max(0, Math.min(1, inputColor[2]/255 * slopes[2] + intercepts[2])) * 255,
-      ];
-  }
+  const canvas = document.getElementById("canvas");
+  const ctx = canvas.getContext('2d');
 
   const slopes = [0.5, 1.2, -0.2];
   const intercepts = [0.25, 0, 0.5];
@@ -44,13 +28,9 @@ _addTest(function(canvas, ctx) {
       [50, 68, 87],
   ];
 
-  for (const color of inputColors) {
-      let outputColor = getColor(color, slopes, intercepts);
+  for (let i = 0 ; i < inputColors.length ; ++i) {
+      const color = inputColors[i];
       ctx.fillStyle = `rgb(${color[0]}, ${color[1]}, ${color[2]})`;
-      ctx.fillRect(0, 0, 10, 10);
-      _assertPixelApprox(canvas, 5, 5, outputColor[0],outputColor[1],outputColor[2],255, 2);
+      ctx.fillRect(i * 10, i * 10, 10, 10);
   }
-
-});
 </script>
-
diff --git a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.componentTransfer.table.tentative-expected.html b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.componentTransfer.table.tentative-expected.html
new file mode 100644
index 0000000000..29e250614c
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.componentTransfer.table.tentative-expected.html
@@ -0,0 +1,51 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>Canvas test: 2d.filter.canvasFilterObject.componentTransfer.table.tentative</title>
+<h1>2d.filter.canvasFilterObject.componentTransfer.table.tentative</h1>
+<p class="desc">Test pixels on CanvasFilter() componentTransfer with table type</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = document.getElementById("canvas");
+  const ctx = canvas.getContext('2d');
+
+  // From https://www.w3.org/TR/SVG11/filters.html#feComponentTransferElement
+  function getTransformedValue(C, V) {
+      // Get the right interval
+      const n = V.length - 1;
+      const k = C == 1 ? n - 1 : Math.floor(C * n);
+      return V[k] + (C - k/n) * n * (V[k + 1] - V[k]);
+  }
+
+  function getColor(inputColor, tableValues) {
+      const result = [0, 0, 0];
+      for (const i in inputColor) {
+          const C = inputColor[i]/255;
+          const Cprime = getTransformedValue(C, tableValues[i]);
+          result[i] = Math.max(0, Math.min(1, Cprime)) * 255;
+      }
+      return result;
+  }
+
+  tableValuesR = [0, 0, 1, 1];
+  tableValuesG = [2, 0, 0.5, 3];
+  tableValuesB = [1, -1, 5, 0];
+
+  const inputColors = [
+      [255, 255, 255],
+      [0, 0, 0],
+      [127, 0, 34],
+      [252, 186, 3],
+      [50, 68, 87],
+  ];
+
+  for (let i = 0 ; i < inputColors.length ; ++i) {
+      const color = inputColors[i];
+      let outputColor = getColor(
+          color, [tableValuesR, tableValuesG, tableValuesB]);
+      ctx.fillStyle = `rgb(${outputColor[0]}, ${outputColor[1]},
+        ${outputColor[2]})`;
+      ctx.fillRect(i * 10, i * 10, 10, 10);
+  }
+</script>
diff --git a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.componentTransfer.table.tentative.html b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.componentTransfer.table.tentative.html
index 4b296d9fd7..0f74d9c3bf 100644
--- a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.componentTransfer.table.tentative.html
+++ b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.componentTransfer.table.tentative.html
@@ -1,41 +1,16 @@
 <!DOCTYPE html>
 <!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<link rel="match" href="2d.filter.canvasFilterObject.componentTransfer.table.tentative-expected.html">
+<meta name=fuzzy content="maxDifference=0-2; totalPixels=0-500">
 <title>Canvas test: 2d.filter.canvasFilterObject.componentTransfer.table.tentative</title>
-<script src="/resources/testharness.js"></script>
-<script src="/resources/testharnessreport.js"></script>
-<script src="/html/canvas/resources/canvas-tests.js"></script>
-<link rel="stylesheet" href="/html/canvas/resources/canvas-tests.css">
-<body class="show_output">
-
 <h1>2d.filter.canvasFilterObject.componentTransfer.table.tentative</h1>
 <p class="desc">Test pixels on CanvasFilter() componentTransfer with table type</p>
-
-
-<p class="output">Actual output:</p>
-<canvas id="c" class="output" width="100" height="50"><p class="fallback">FAIL (fallback content)</p></canvas>
-
-<ul id="d"></ul>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
 <script>
-var t = async_test("Test pixels on CanvasFilter() componentTransfer with table type");
-_addTest(function(canvas, ctx) {
-
-  // From https://www.w3.org/TR/SVG11/filters.html#feComponentTransferElement
-  function getTransformedValue(C, V) {
-      // Get the right interval
-      const n = V.length - 1;
-      const k = C == 1 ? n - 1 : Math.floor(C * n);
-      return V[k] + (C - k/n) * n * (V[k + 1] - V[k]);
-  }
-
-  function getColor(inputColor, tableValues) {
-      const result = [0, 0, 0];
-      for (const i in inputColor) {
-          const C = inputColor[i]/255;
-          const Cprime = getTransformedValue(C, tableValues[i]);
-          result[i] = Math.max(0, Math.min(1, Cprime)) * 255;
-      }
-      return result;
-  }
+  const canvas = document.getElementById("canvas");
+  const ctx = canvas.getContext('2d');
 
   tableValuesR = [0, 0, 1, 1];
   tableValuesG = [2, 0, 0.5, 3];
@@ -54,13 +29,9 @@ _addTest(function(canvas, ctx) {
       [50, 68, 87],
   ];
 
-  for (const color of inputColors) {
-      let outputColor = getColor(color, [tableValuesR, tableValuesG, tableValuesB]);
+  for (let i = 0 ; i < inputColors.length ; ++i) {
+      const color = inputColors[i];
       ctx.fillStyle = `rgb(${color[0]}, ${color[1]}, ${color[2]})`;
-      ctx.fillRect(0, 0, 10, 10);
-      _assertPixelApprox(canvas, 5, 5, outputColor[0],outputColor[1],outputColor[2],255, 2);
+      ctx.fillRect(i * 10, i * 10, 10, 10);
   }
-
-});
 </script>
-
diff --git a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.convolveMatrix.exceptions.tentative.html b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.convolveMatrix.exceptions.tentative.html
index b80600c141..a288541057 100644
--- a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.convolveMatrix.exceptions.tentative.html
+++ b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.convolveMatrix.exceptions.tentative.html
@@ -19,23 +19,39 @@
 var t = async_test("Test exceptions on CanvasFilter() convolveMatrix");
 _addTest(function(canvas, ctx) {
 
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'convolveMatrix'}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'convolveMatrix', divisor: 2}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'convolveMatrix', kernelMatrix: null}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'convolveMatrix', kernelMatrix: 1}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'convolveMatrix', kernelMatrix: [[1, 0], [0]]}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'convolveMatrix', kernelMatrix: [[1, 'a'], [0]]}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'convolveMatrix', kernelMatrix: [[1, 0], 0]}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'convolveMatrix', kernelMatrix: [[1, 0], [0, Infinity]]}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'convolveMatrix', kernelMatrix: []}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'convolveMatrix', kernelMatrix: [1]}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'convolveMatrix', kernelMatrix: [1, 2, 3, 4]}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'convolveMatrix', kernelMatrix: [[], []]}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'convolveMatrix', kernelMatrix: [[1, 2], []]}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'convolveMatrix', kernelMatrix: [[], [1, 2]]}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'convolveMatrix'}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'convolveMatrix', divisor: 2}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'convolveMatrix', kernelMatrix: null}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'convolveMatrix', kernelMatrix: 1}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'convolveMatrix', kernelMatrix: [[1, 0], [0]]}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'convolveMatrix', kernelMatrix: [[1, 'a'], [0]]}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'convolveMatrix', kernelMatrix: [[1, 0], 0]}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'convolveMatrix', kernelMatrix: [[1, 0], [0, Infinity]]}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'convolveMatrix', kernelMatrix: []}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'convolveMatrix', kernelMatrix: [1]}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'convolveMatrix', kernelMatrix: [1, 2, 3, 4]}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'convolveMatrix', kernelMatrix: [[], []]}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'convolveMatrix', kernelMatrix: [[1, 2], []]}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'convolveMatrix', kernelMatrix: [[], [1, 2]]}); });
   // This should not throw an error
-  ctx.filter = new CanvasFilter({name: 'convolveMatrix', kernelMatrix: [[]]});
-  ctx.filter = new CanvasFilter({name: 'convolveMatrix', kernelMatrix: [[1]]});
+  ctx.filter = new CanvasFilter(
+    {name: 'convolveMatrix', kernelMatrix: [[]]});
+  ctx.filter = new CanvasFilter(
+    {name: 'convolveMatrix', kernelMatrix: [[1]]});
 
 });
 </script>
diff --git a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.dropShadow.exceptions.tentative.html b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.dropShadow.exceptions.tentative.html
index 8c07a72b2b..05984a47f8 100644
--- a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.dropShadow.exceptions.tentative.html
+++ b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.dropShadow.exceptions.tentative.html
@@ -19,104 +19,250 @@
 var t = async_test("Test exceptions on CanvasFilter() dropShadow object");
 _addTest(function(canvas, ctx) {
 
+  // Should not throw an error.
   // dx
-  _assert(new CanvasFilter({name: 'dropShadow', dx: 10}), "new CanvasFilter({name: 'dropShadow', dx: 10})");
-  _assert(new CanvasFilter({name: 'dropShadow', dx: -1}), "new CanvasFilter({name: 'dropShadow', dx: -1})");
-  _assert(new CanvasFilter({name: 'dropShadow', dx: 0.5}), "new CanvasFilter({name: 'dropShadow', dx: 0.5})");
-  _assert(new CanvasFilter({name: 'dropShadow', dx: null}), "new CanvasFilter({name: 'dropShadow', dx: null})");
-  _assert(new CanvasFilter({name: 'dropShadow', dx: true}), "new CanvasFilter({name: 'dropShadow', dx: true})");
-  _assert(new CanvasFilter({name: 'dropShadow', dx: false}), "new CanvasFilter({name: 'dropShadow', dx: false})");
-  _assert(new CanvasFilter({name: 'dropShadow', dx: []}), "new CanvasFilter({name: 'dropShadow', dx: []})");
-  _assert(new CanvasFilter({name: 'dropShadow', dx: [20]}), "new CanvasFilter({name: 'dropShadow', dx: [\""+(20)+"\"]})");
-  _assert(new CanvasFilter({name: 'dropShadow', dx: '30'}), "new CanvasFilter({name: 'dropShadow', dx: '30'})");
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: 10});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: -1});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: 0.5});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: null});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: true});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: false});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: []});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: [20]});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: '30'});
   // dy
-  _assert(new CanvasFilter({name: 'dropShadow', dy: 10}), "new CanvasFilter({name: 'dropShadow', dy: 10})");
-  _assert(new CanvasFilter({name: 'dropShadow', dy: -1}), "new CanvasFilter({name: 'dropShadow', dy: -1})");
-  _assert(new CanvasFilter({name: 'dropShadow', dy: 0.5}), "new CanvasFilter({name: 'dropShadow', dy: 0.5})");
-  _assert(new CanvasFilter({name: 'dropShadow', dy: null}), "new CanvasFilter({name: 'dropShadow', dy: null})");
-  _assert(new CanvasFilter({name: 'dropShadow', dy: true}), "new CanvasFilter({name: 'dropShadow', dy: true})");
-  _assert(new CanvasFilter({name: 'dropShadow', dy: false}), "new CanvasFilter({name: 'dropShadow', dy: false})");
-  _assert(new CanvasFilter({name: 'dropShadow', dy: []}), "new CanvasFilter({name: 'dropShadow', dy: []})");
-  _assert(new CanvasFilter({name: 'dropShadow', dy: [20]}), "new CanvasFilter({name: 'dropShadow', dy: [\""+(20)+"\"]})");
-  _assert(new CanvasFilter({name: 'dropShadow', dy: '30'}), "new CanvasFilter({name: 'dropShadow', dy: '30'})");
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: 10});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: -1});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: 0.5});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: null});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: true});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: false});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: []});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: [20]});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: '30'});
   // floodOpacity
-  _assert(new CanvasFilter({name: 'dropShadow', floodOpacity: 10}), "new CanvasFilter({name: 'dropShadow', floodOpacity: 10})");
-  _assert(new CanvasFilter({name: 'dropShadow', floodOpacity: -1}), "new CanvasFilter({name: 'dropShadow', floodOpacity: -1})");
-  _assert(new CanvasFilter({name: 'dropShadow', floodOpacity: 0.5}), "new CanvasFilter({name: 'dropShadow', floodOpacity: 0.5})");
-  _assert(new CanvasFilter({name: 'dropShadow', floodOpacity: null}), "new CanvasFilter({name: 'dropShadow', floodOpacity: null})");
-  _assert(new CanvasFilter({name: 'dropShadow', floodOpacity: true}), "new CanvasFilter({name: 'dropShadow', floodOpacity: true})");
-  _assert(new CanvasFilter({name: 'dropShadow', floodOpacity: false}), "new CanvasFilter({name: 'dropShadow', floodOpacity: false})");
-  _assert(new CanvasFilter({name: 'dropShadow', floodOpacity: []}), "new CanvasFilter({name: 'dropShadow', floodOpacity: []})");
-  _assert(new CanvasFilter({name: 'dropShadow', floodOpacity: [20]}), "new CanvasFilter({name: 'dropShadow', floodOpacity: [\""+(20)+"\"]})");
-  _assert(new CanvasFilter({name: 'dropShadow', floodOpacity: '30'}), "new CanvasFilter({name: 'dropShadow', floodOpacity: '30'})");
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: 10});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: -1});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: 0.5});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: null});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: true});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: false});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: []});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: [20]});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: '30'});
+  // dx
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: 10});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: -1});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: 0.5});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: null});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: true});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: false});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: []});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: [20]});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: '30'});
+  // dy
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: 10});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: -1});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: 0.5});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: null});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: true});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: false});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: []});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: [20]});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: '30'});
+  // floodOpacity
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: 10});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: -1});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: 0.5});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: null});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: true});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: false});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: []});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: [20]});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: '30'});
   // stdDeviation
-  _assert(new CanvasFilter({name: 'dropShadow', stdDeviation: 10}), "new CanvasFilter({name: 'dropShadow', stdDeviation: 10})");
-  _assert(new CanvasFilter({name: 'dropShadow', stdDeviation: -1}), "new CanvasFilter({name: 'dropShadow', stdDeviation: -1})");
-  _assert(new CanvasFilter({name: 'dropShadow', stdDeviation: 0.5}), "new CanvasFilter({name: 'dropShadow', stdDeviation: 0.5})");
-  _assert(new CanvasFilter({name: 'dropShadow', stdDeviation: null}), "new CanvasFilter({name: 'dropShadow', stdDeviation: null})");
-  _assert(new CanvasFilter({name: 'dropShadow', stdDeviation: true}), "new CanvasFilter({name: 'dropShadow', stdDeviation: true})");
-  _assert(new CanvasFilter({name: 'dropShadow', stdDeviation: false}), "new CanvasFilter({name: 'dropShadow', stdDeviation: false})");
-  _assert(new CanvasFilter({name: 'dropShadow', stdDeviation: []}), "new CanvasFilter({name: 'dropShadow', stdDeviation: []})");
-  _assert(new CanvasFilter({name: 'dropShadow', stdDeviation: [20]}), "new CanvasFilter({name: 'dropShadow', stdDeviation: [\""+(20)+"\"]})");
-  _assert(new CanvasFilter({name: 'dropShadow', stdDeviation: '30'}), "new CanvasFilter({name: 'dropShadow', stdDeviation: '30'})");
-  _assert(new CanvasFilter({name: 'dropShadow', stdDeviation: [10, -1]}), "new CanvasFilter({name: 'dropShadow', stdDeviation: [10, -1]})");
-  _assert(new CanvasFilter({name: 'dropShadow', stdDeviation: [0.5, null]}), "new CanvasFilter({name: 'dropShadow', stdDeviation: [0.5, null]})");
-  _assert(new CanvasFilter({name: 'dropShadow', stdDeviation: [true, false]}), "new CanvasFilter({name: 'dropShadow', stdDeviation: [true, false]})");
-  _assert(new CanvasFilter({name: 'dropShadow', stdDeviation: [[], [20]]}), "new CanvasFilter({name: 'dropShadow', stdDeviation: [[], [\""+(20)+"\"]]})");
-  _assert(new CanvasFilter({name: 'dropShadow', stdDeviation: ['30', ['40']]}), "new CanvasFilter({name: 'dropShadow', stdDeviation: ['30', ['40']]})");
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: 10});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: -1});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: 0.5});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: null});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: true});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: false});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: []});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: [20]});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: '30'});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: [10, -1]});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: [0.5, null]});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: [true, false]});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: [[], [20]]});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: ['30', ['40']]});
   // floodColor
-  _assert(new CanvasFilter({name: 'dropShadow', floodColor: 'red'}), "new CanvasFilter({name: 'dropShadow', floodColor: 'red'})");
-  _assert(new CanvasFilter({name: 'dropShadow', floodColor: 'canvas'}), "new CanvasFilter({name: 'dropShadow', floodColor: 'canvas'})");
-  _assert(new CanvasFilter({name: 'dropShadow', floodColor: 'rgba(4, -3, 0.5, 1)'}), "new CanvasFilter({name: 'dropShadow', floodColor: 'rgba(4, -3, 0.5, 1)'})");
-  _assert(new CanvasFilter({name: 'dropShadow', floodColor: '#aabbccdd'}), "new CanvasFilter({name: 'dropShadow', floodColor: '#aabbccdd'})");
-  _assert(new CanvasFilter({name: 'dropShadow', floodColor: '#abcd'}), "new CanvasFilter({name: 'dropShadow', floodColor: '#abcd'})");
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodColor: 'red'});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodColor: 'canvas'});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodColor: 'rgba(4, -3, 0.5, 1)'});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodColor: '#aabbccdd'});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodColor: '#abcd'});
 
+  // Should throw a TypeError.
   // dx
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', dx: NaN}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', dx: Infinity}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', dx: -Infinity}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', dx: undefined}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', dx: 'test'}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', dx: {}}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', dx: [1, 2]}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: NaN}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: Infinity}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: -Infinity}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: undefined}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: 'test'}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: {}}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: [1, 2]}); });
   // dy
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', dy: NaN}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', dy: Infinity}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', dy: -Infinity}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', dy: undefined}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', dy: 'test'}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', dy: {}}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', dy: [1, 2]}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: NaN}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: Infinity}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: -Infinity}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: undefined}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: 'test'}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: {}}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: [1, 2]}); });
   // floodOpacity
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', floodOpacity: NaN}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', floodOpacity: Infinity}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', floodOpacity: -Infinity}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', floodOpacity: undefined}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', floodOpacity: 'test'}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', floodOpacity: {}}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', floodOpacity: [1, 2]}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: NaN}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: Infinity}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: -Infinity}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: undefined}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: 'test'}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: {}}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: [1, 2]}); });
   // stdDeviation
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', stdDeviation: NaN}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', stdDeviation: Infinity}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', stdDeviation: -Infinity}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', stdDeviation: undefined}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', stdDeviation: 'test'}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', stdDeviation: {}}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', stdDeviation: [1, 2, 3]}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', stdDeviation: [1, NaN]}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', stdDeviation: [1, Infinity]}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', stdDeviation: [1, -Infinity]}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', stdDeviation: [1, undefined]}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', stdDeviation: [1, 'test']}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', stdDeviation: [1, {}]}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', stdDeviation: [1, [2, 3]]}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: NaN}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: Infinity}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: -Infinity}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: undefined}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: 'test'}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: {}}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: [1, 2, 3]}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: [1, NaN]}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: [1, Infinity]}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: [1, -Infinity]}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: [1, undefined]}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: [1, 'test']}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: [1, {}]}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: [1, [2, 3]]}); });
   // floodColor
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', floodColor: 'test'}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', floodColor: 'rgba(NaN, 3, 2, 1)'}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', floodColor: 10}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', floodColor: undefined}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', floodColor: null}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', floodColor: NaN}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodColor: 'test'}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodColor: 'rgba(NaN, 3, 2, 1)'}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodColor: 10}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodColor: undefined}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodColor: null}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodColor: NaN}); });
 
 });
 </script>
diff --git a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.dropShadow.tentative.html b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.dropShadow.tentative.html
index 47bb891b3f..d6e7066473 100644
--- a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.dropShadow.tentative.html
+++ b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.dropShadow.tentative.html
@@ -22,86 +22,58 @@
   // Parameter defaults.
   ctx.filter = new CanvasFilter({name: 'dropShadow'});
   ctx.fillRect(10, 10, 80, 80);
-
   // All parameters specified.
-  ctx.filter = new CanvasFilter(
-    {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 5,
+  ctx.filter = new CanvasFilter({name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 5,
      floodColor: 'purple', floodOpacity: 0.7});
   ctx.fillRect(110, 10, 80, 80);
-
   // Named color.
-  ctx.filter = new CanvasFilter(
-    {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 3,
+  ctx.filter = new CanvasFilter({name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 3,
      floodColor: 'purple'});
   ctx.fillRect(10, 110, 80, 80);
-
   // System color.
-  ctx.filter = new CanvasFilter(
-    {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 3,
+  ctx.filter = new CanvasFilter({name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 3,
      floodColor: 'LinkText'});
   ctx.fillRect(110, 110, 80, 80);
-
   // Numerical color.
-  ctx.filter = new CanvasFilter(
-    {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 3,
+  ctx.filter = new CanvasFilter({name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 3,
      floodColor: 'rgba(20, 50, 130, 1)'});
   ctx.fillRect(210, 110, 80, 80);
-
   // Transparent floodColor.
-  ctx.filter = new CanvasFilter(
-    {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 3,
+  ctx.filter = new CanvasFilter({name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 3,
      floodColor: 'rgba(20, 50, 130, 0.7)'});
   ctx.fillRect(310, 110, 80, 80);
-
   // Transparent floodColor and floodOpacity.
-  ctx.filter = new CanvasFilter(
-    {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 3,
+  ctx.filter = new CanvasFilter({name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 3,
      floodColor: 'rgba(20, 50, 130, 0.7)', floodOpacity: 0.7});
   ctx.fillRect(410, 110, 80, 80);
-
   // No blur.
-  ctx.filter = new CanvasFilter(
-    {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 0,
+  ctx.filter = new CanvasFilter({name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 0,
      floodColor: 'purple'});
   ctx.fillRect(10, 210, 80, 80);
-
   // Single float blur.
-  ctx.filter = new CanvasFilter(
-    {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 5,
+  ctx.filter = new CanvasFilter({name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 5,
      floodColor: 'purple'});
   ctx.fillRect(110, 210, 80, 80);
-
   // Single negative float blur.
-  ctx.filter = new CanvasFilter(
-    {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: -5,
+  ctx.filter = new CanvasFilter({name: 'dropShadow', dx: 9, dy: 12, stdDeviation: -5,
      floodColor: 'purple'});
   ctx.fillRect(210, 210, 80, 80);
-
   // Two floats (X&Y) blur.
-  ctx.filter = new CanvasFilter(
-    {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: [3, 5],
+  ctx.filter = new CanvasFilter({name: 'dropShadow', dx: 9, dy: 12, stdDeviation: [3, 5],
      floodColor: 'purple'});
   ctx.fillRect(310, 210, 80, 80);
-
   // Two negative floats (X&Y) blur.
-  ctx.filter = new CanvasFilter(
-    {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: [-3, -5],
+  ctx.filter = new CanvasFilter({name: 'dropShadow', dx: 9, dy: 12, stdDeviation: [-3, -5],
      floodColor: 'purple'});
   ctx.fillRect(410, 210, 80, 80);
-
   // Degenerate parameter values.
-  ctx.filter = new CanvasFilter(
-    {name: 'dropShadow', dx: [-5], dy: [], stdDeviation: null,
+  ctx.filter = new CanvasFilter({name: 'dropShadow', dx: [-5], dy: [], stdDeviation: null,
      floodColor: 'purple', floodOpacity: [2]});
   ctx.fillRect(10, 310, 80, 80);
-
-  ctx.filter = new CanvasFilter(
-    {name: 'dropShadow', dx: null, dy: '5', stdDeviation: [[-5], ['3']],
+  ctx.filter = new CanvasFilter({name: 'dropShadow', dx: null, dy: '5', stdDeviation: [[-5], ['3']],
      floodColor: 'purple', floodOpacity: '0.8'});
   ctx.fillRect(110, 310, 80, 80);
-
-  ctx.filter = new CanvasFilter(
-    {name: 'dropShadow', dx: true, dy: ['10'], stdDeviation: false,
+  ctx.filter = new CanvasFilter({name: 'dropShadow', dx: true, dy: ['10'], stdDeviation: false,
      floodColor: 'purple', floodOpacity: ['0.4']});
   ctx.fillRect(210, 310, 80, 80);
 </script>
diff --git a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.isotropic.tentative-expected.html b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.isotropic.tentative-expected.html
new file mode 100644
index 0000000000..dac31c97f1
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.isotropic.tentative-expected.html
@@ -0,0 +1,15 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>Canvas test: 2d.filter.canvasFilterObject.gaussianBlur.isotropic.tentative</title>
+<h1>2d.filter.canvasFilterObject.gaussianBlur.isotropic.tentative</h1>
+<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
+
+<svg xmlns="http://www.w3.org/2000/svg"
+     width="100" height="100"
+     color-interpolation-filters="sRGB">
+  <filter id="blur" x="-50%" y="-50%" width="200%" height="200%">
+    <feGaussianBlur stdDeviation="4 4" />
+  </filter>
+  <rect x="25" y="25" width="50" height="50"
+        fill="teal" filter="url(#blur)" />
+</svg>
diff --git a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.isotropic.tentative.html b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.isotropic.tentative.html
new file mode 100644
index 0000000000..f4c8c1033a
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.isotropic.tentative.html
@@ -0,0 +1,20 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<link rel="match" href="2d.filter.canvasFilterObject.gaussianBlur.isotropic.tentative-expected.html">
+<title>Canvas test: 2d.filter.canvasFilterObject.gaussianBlur.isotropic.tentative</title>
+<h1>2d.filter.canvasFilterObject.gaussianBlur.isotropic.tentative</h1>
+<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = document.getElementById("canvas");
+  const ctx = canvas.getContext('2d');
+
+  ctx.fillStyle = 'teal';
+  ctx.filter = new CanvasFilter({
+      name: 'gaussianBlur',
+      stdDeviation: [4, 4],
+  });
+  ctx.fillRect(25, 25, 50, 50);
+</script>
diff --git a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.mostly-x.tentative-expected.html b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.mostly-x.tentative-expected.html
new file mode 100644
index 0000000000..88d0cb2de2
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.mostly-x.tentative-expected.html
@@ -0,0 +1,15 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>Canvas test: 2d.filter.canvasFilterObject.gaussianBlur.mostly-x.tentative</title>
+<h1>2d.filter.canvasFilterObject.gaussianBlur.mostly-x.tentative</h1>
+<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
+
+<svg xmlns="http://www.w3.org/2000/svg"
+     width="100" height="100"
+     color-interpolation-filters="sRGB">
+  <filter id="blur" x="-50%" y="-50%" width="200%" height="200%">
+    <feGaussianBlur stdDeviation="4 1" />
+  </filter>
+  <rect x="25" y="25" width="50" height="50"
+        fill="teal" filter="url(#blur)" />
+</svg>
diff --git a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.mostly-x.tentative.html b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.mostly-x.tentative.html
new file mode 100644
index 0000000000..b3efcb8c3e
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.mostly-x.tentative.html
@@ -0,0 +1,20 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<link rel="match" href="2d.filter.canvasFilterObject.gaussianBlur.mostly-x.tentative-expected.html">
+<title>Canvas test: 2d.filter.canvasFilterObject.gaussianBlur.mostly-x.tentative</title>
+<h1>2d.filter.canvasFilterObject.gaussianBlur.mostly-x.tentative</h1>
+<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = document.getElementById("canvas");
+  const ctx = canvas.getContext('2d');
+
+  ctx.fillStyle = 'teal';
+  ctx.filter = new CanvasFilter({
+      name: 'gaussianBlur',
+      stdDeviation: [4, 1],
+  });
+  ctx.fillRect(25, 25, 50, 50);
+</script>
diff --git a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.mostly-y.tentative-expected.html b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.mostly-y.tentative-expected.html
new file mode 100644
index 0000000000..744983d4ae
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.mostly-y.tentative-expected.html
@@ -0,0 +1,15 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>Canvas test: 2d.filter.canvasFilterObject.gaussianBlur.mostly-y.tentative</title>
+<h1>2d.filter.canvasFilterObject.gaussianBlur.mostly-y.tentative</h1>
+<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
+
+<svg xmlns="http://www.w3.org/2000/svg"
+     width="100" height="100"
+     color-interpolation-filters="sRGB">
+  <filter id="blur" x="-50%" y="-50%" width="200%" height="200%">
+    <feGaussianBlur stdDeviation="1 4" />
+  </filter>
+  <rect x="25" y="25" width="50" height="50"
+        fill="teal" filter="url(#blur)" />
+</svg>
diff --git a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.mostly-y.tentative.html b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.mostly-y.tentative.html
new file mode 100644
index 0000000000..d5cc6e0058
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.mostly-y.tentative.html
@@ -0,0 +1,20 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<link rel="match" href="2d.filter.canvasFilterObject.gaussianBlur.mostly-y.tentative-expected.html">
+<title>Canvas test: 2d.filter.canvasFilterObject.gaussianBlur.mostly-y.tentative</title>
+<h1>2d.filter.canvasFilterObject.gaussianBlur.mostly-y.tentative</h1>
+<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = document.getElementById("canvas");
+  const ctx = canvas.getContext('2d');
+
+  ctx.fillStyle = 'teal';
+  ctx.filter = new CanvasFilter({
+      name: 'gaussianBlur',
+      stdDeviation: [1, 4],
+  });
+  ctx.fillRect(25, 25, 50, 50);
+</script>
diff --git a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.isotropic-expected.html b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.isotropic-expected.html
deleted file mode 100644
index f9571f208e..0000000000
--- a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.isotropic-expected.html
+++ /dev/null
@@ -1,15 +0,0 @@
-<!DOCTYPE html>
-<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
-<title>Canvas test: 2d.filter.canvasFilterObject.gaussianBlur.tentative.isotropic</title>
-<h1>2d.filter.canvasFilterObject.gaussianBlur.tentative.isotropic</h1>
-<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
-
-<svg xmlns="http://www.w3.org/2000/svg"
-     width="100" height="100"
-     color-interpolation-filters="sRGB">
-  <filter id="blur" x="-50%" y="-50%" width="200%" height="200%">
-    <feGaussianBlur stdDeviation="4 4" />
-  </filter>
-  <rect x="25" y="25" width="50" height="50"
-        fill="teal" filter="url(#blur)" />
-</svg>
diff --git a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.isotropic.html b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.isotropic.html
deleted file mode 100644
index 6376d07b0e..0000000000
--- a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.isotropic.html
+++ /dev/null
@@ -1,20 +0,0 @@
-<!DOCTYPE html>
-<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
-<link rel="match" href="2d.filter.canvasFilterObject.gaussianBlur.tentative.isotropic-expected.html">
-<title>Canvas test: 2d.filter.canvasFilterObject.gaussianBlur.tentative.isotropic</title>
-<h1>2d.filter.canvasFilterObject.gaussianBlur.tentative.isotropic</h1>
-<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
-<canvas id="canvas" width="100" height="100">
-  <p class="fallback">FAIL (fallback content)</p>
-</canvas>
-<script>
-  const canvas = document.getElementById("canvas");
-  const ctx = canvas.getContext('2d');
-
-  ctx.fillStyle = 'teal';
-  ctx.filter = new CanvasFilter({
-      name: 'gaussianBlur',
-      stdDeviation: [4, 4],
-  });
-  ctx.fillRect(25, 25, 50, 50);
-</script>
diff --git a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.mostly-x-expected.html b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.mostly-x-expected.html
deleted file mode 100644
index e76613271f..0000000000
--- a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.mostly-x-expected.html
+++ /dev/null
@@ -1,15 +0,0 @@
-<!DOCTYPE html>
-<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
-<title>Canvas test: 2d.filter.canvasFilterObject.gaussianBlur.tentative.mostly-x</title>
-<h1>2d.filter.canvasFilterObject.gaussianBlur.tentative.mostly-x</h1>
-<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
-
-<svg xmlns="http://www.w3.org/2000/svg"
-     width="100" height="100"
-     color-interpolation-filters="sRGB">
-  <filter id="blur" x="-50%" y="-50%" width="200%" height="200%">
-    <feGaussianBlur stdDeviation="4 1" />
-  </filter>
-  <rect x="25" y="25" width="50" height="50"
-        fill="teal" filter="url(#blur)" />
-</svg>
diff --git a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.mostly-x.html b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.mostly-x.html
deleted file mode 100644
index 145cb32757..0000000000
--- a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.mostly-x.html
+++ /dev/null
@@ -1,20 +0,0 @@
-<!DOCTYPE html>
-<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
-<link rel="match" href="2d.filter.canvasFilterObject.gaussianBlur.tentative.mostly-x-expected.html">
-<title>Canvas test: 2d.filter.canvasFilterObject.gaussianBlur.tentative.mostly-x</title>
-<h1>2d.filter.canvasFilterObject.gaussianBlur.tentative.mostly-x</h1>
-<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
-<canvas id="canvas" width="100" height="100">
-  <p class="fallback">FAIL (fallback content)</p>
-</canvas>
-<script>
-  const canvas = document.getElementById("canvas");
-  const ctx = canvas.getContext('2d');
-
-  ctx.fillStyle = 'teal';
-  ctx.filter = new CanvasFilter({
-      name: 'gaussianBlur',
-      stdDeviation: [4, 1],
-  });
-  ctx.fillRect(25, 25, 50, 50);
-</script>
diff --git a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.mostly-y-expected.html b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.mostly-y-expected.html
deleted file mode 100644
index 0f214fca9f..0000000000
--- a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.mostly-y-expected.html
+++ /dev/null
@@ -1,15 +0,0 @@
-<!DOCTYPE html>
-<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
-<title>Canvas test: 2d.filter.canvasFilterObject.gaussianBlur.tentative.mostly-y</title>
-<h1>2d.filter.canvasFilterObject.gaussianBlur.tentative.mostly-y</h1>
-<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
-
-<svg xmlns="http://www.w3.org/2000/svg"
-     width="100" height="100"
-     color-interpolation-filters="sRGB">
-  <filter id="blur" x="-50%" y="-50%" width="200%" height="200%">
-    <feGaussianBlur stdDeviation="1 4" />
-  </filter>
-  <rect x="25" y="25" width="50" height="50"
-        fill="teal" filter="url(#blur)" />
-</svg>
diff --git a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.mostly-y.html b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.mostly-y.html
deleted file mode 100644
index e921e0eaa6..0000000000
--- a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.mostly-y.html
+++ /dev/null
@@ -1,20 +0,0 @@
-<!DOCTYPE html>
-<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
-<link rel="match" href="2d.filter.canvasFilterObject.gaussianBlur.tentative.mostly-y-expected.html">
-<title>Canvas test: 2d.filter.canvasFilterObject.gaussianBlur.tentative.mostly-y</title>
-<h1>2d.filter.canvasFilterObject.gaussianBlur.tentative.mostly-y</h1>
-<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
-<canvas id="canvas" width="100" height="100">
-  <p class="fallback">FAIL (fallback content)</p>
-</canvas>
-<script>
-  const canvas = document.getElementById("canvas");
-  const ctx = canvas.getContext('2d');
-
-  ctx.fillStyle = 'teal';
-  ctx.filter = new CanvasFilter({
-      name: 'gaussianBlur',
-      stdDeviation: [1, 4],
-  });
-  ctx.fillRect(25, 25, 50, 50);
-</script>
diff --git a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.x-only-expected.html b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.x-only-expected.html
deleted file mode 100644
index 285a641726..0000000000
--- a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.x-only-expected.html
+++ /dev/null
@@ -1,15 +0,0 @@
-<!DOCTYPE html>
-<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
-<title>Canvas test: 2d.filter.canvasFilterObject.gaussianBlur.tentative.x-only</title>
-<h1>2d.filter.canvasFilterObject.gaussianBlur.tentative.x-only</h1>
-<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
-
-<svg xmlns="http://www.w3.org/2000/svg"
-     width="100" height="100"
-     color-interpolation-filters="sRGB">
-  <filter id="blur" x="-50%" y="-50%" width="200%" height="200%">
-    <feGaussianBlur stdDeviation="4 0" />
-  </filter>
-  <rect x="25" y="25" width="50" height="50"
-        fill="teal" filter="url(#blur)" />
-</svg>
diff --git a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.x-only.html b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.x-only.html
deleted file mode 100644
index fd6ac687f9..0000000000
--- a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.x-only.html
+++ /dev/null
@@ -1,20 +0,0 @@
-<!DOCTYPE html>
-<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
-<link rel="match" href="2d.filter.canvasFilterObject.gaussianBlur.tentative.x-only-expected.html">
-<title>Canvas test: 2d.filter.canvasFilterObject.gaussianBlur.tentative.x-only</title>
-<h1>2d.filter.canvasFilterObject.gaussianBlur.tentative.x-only</h1>
-<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
-<canvas id="canvas" width="100" height="100">
-  <p class="fallback">FAIL (fallback content)</p>
-</canvas>
-<script>
-  const canvas = document.getElementById("canvas");
-  const ctx = canvas.getContext('2d');
-
-  ctx.fillStyle = 'teal';
-  ctx.filter = new CanvasFilter({
-      name: 'gaussianBlur',
-      stdDeviation: [4, 0],
-  });
-  ctx.fillRect(25, 25, 50, 50);
-</script>
diff --git a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.y-only-expected.html b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.y-only-expected.html
deleted file mode 100644
index d59945b5da..0000000000
--- a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.y-only-expected.html
+++ /dev/null
@@ -1,15 +0,0 @@
-<!DOCTYPE html>
-<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
-<title>Canvas test: 2d.filter.canvasFilterObject.gaussianBlur.tentative.y-only</title>
-<h1>2d.filter.canvasFilterObject.gaussianBlur.tentative.y-only</h1>
-<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
-
-<svg xmlns="http://www.w3.org/2000/svg"
-     width="100" height="100"
-     color-interpolation-filters="sRGB">
-  <filter id="blur" x="-50%" y="-50%" width="200%" height="200%">
-    <feGaussianBlur stdDeviation="0 4" />
-  </filter>
-  <rect x="25" y="25" width="50" height="50"
-        fill="teal" filter="url(#blur)" />
-</svg>
diff --git a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.y-only.html b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.y-only.html
deleted file mode 100644
index 6442433e7c..0000000000
--- a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.y-only.html
+++ /dev/null
@@ -1,20 +0,0 @@
-<!DOCTYPE html>
-<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
-<link rel="match" href="2d.filter.canvasFilterObject.gaussianBlur.tentative.y-only-expected.html">
-<title>Canvas test: 2d.filter.canvasFilterObject.gaussianBlur.tentative.y-only</title>
-<h1>2d.filter.canvasFilterObject.gaussianBlur.tentative.y-only</h1>
-<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
-<canvas id="canvas" width="100" height="100">
-  <p class="fallback">FAIL (fallback content)</p>
-</canvas>
-<script>
-  const canvas = document.getElementById("canvas");
-  const ctx = canvas.getContext('2d');
-
-  ctx.fillStyle = 'teal';
-  ctx.filter = new CanvasFilter({
-      name: 'gaussianBlur',
-      stdDeviation: [0, 4],
-  });
-  ctx.fillRect(25, 25, 50, 50);
-</script>
diff --git a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.x-only.tentative-expected.html b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.x-only.tentative-expected.html
new file mode 100644
index 0000000000..e611113e42
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.x-only.tentative-expected.html
@@ -0,0 +1,15 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>Canvas test: 2d.filter.canvasFilterObject.gaussianBlur.x-only.tentative</title>
+<h1>2d.filter.canvasFilterObject.gaussianBlur.x-only.tentative</h1>
+<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
+
+<svg xmlns="http://www.w3.org/2000/svg"
+     width="100" height="100"
+     color-interpolation-filters="sRGB">
+  <filter id="blur" x="-50%" y="-50%" width="200%" height="200%">
+    <feGaussianBlur stdDeviation="4 0" />
+  </filter>
+  <rect x="25" y="25" width="50" height="50"
+        fill="teal" filter="url(#blur)" />
+</svg>
diff --git a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.x-only.tentative.html b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.x-only.tentative.html
new file mode 100644
index 0000000000..4e8576fe74
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.x-only.tentative.html
@@ -0,0 +1,20 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<link rel="match" href="2d.filter.canvasFilterObject.gaussianBlur.x-only.tentative-expected.html">
+<title>Canvas test: 2d.filter.canvasFilterObject.gaussianBlur.x-only.tentative</title>
+<h1>2d.filter.canvasFilterObject.gaussianBlur.x-only.tentative</h1>
+<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = document.getElementById("canvas");
+  const ctx = canvas.getContext('2d');
+
+  ctx.fillStyle = 'teal';
+  ctx.filter = new CanvasFilter({
+      name: 'gaussianBlur',
+      stdDeviation: [4, 0],
+  });
+  ctx.fillRect(25, 25, 50, 50);
+</script>
diff --git a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.y-only.tentative-expected.html b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.y-only.tentative-expected.html
new file mode 100644
index 0000000000..c6d915cb07
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.y-only.tentative-expected.html
@@ -0,0 +1,15 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>Canvas test: 2d.filter.canvasFilterObject.gaussianBlur.y-only.tentative</title>
+<h1>2d.filter.canvasFilterObject.gaussianBlur.y-only.tentative</h1>
+<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
+
+<svg xmlns="http://www.w3.org/2000/svg"
+     width="100" height="100"
+     color-interpolation-filters="sRGB">
+  <filter id="blur" x="-50%" y="-50%" width="200%" height="200%">
+    <feGaussianBlur stdDeviation="0 4" />
+  </filter>
+  <rect x="25" y="25" width="50" height="50"
+        fill="teal" filter="url(#blur)" />
+</svg>
diff --git a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.y-only.tentative.html b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.y-only.tentative.html
new file mode 100644
index 0000000000..ec0a2353cf
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.gaussianBlur.y-only.tentative.html
@@ -0,0 +1,20 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<link rel="match" href="2d.filter.canvasFilterObject.gaussianBlur.y-only.tentative-expected.html">
+<title>Canvas test: 2d.filter.canvasFilterObject.gaussianBlur.y-only.tentative</title>
+<h1>2d.filter.canvasFilterObject.gaussianBlur.y-only.tentative</h1>
+<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = document.getElementById("canvas");
+  const ctx = canvas.getContext('2d');
+
+  ctx.fillStyle = 'teal';
+  ctx.filter = new CanvasFilter({
+      name: 'gaussianBlur',
+      stdDeviation: [0, 4],
+  });
+  ctx.fillRect(25, 25, 50, 50);
+</script>
diff --git a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.turbulence.inputTypes.tentative.html b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.turbulence.inputTypes.tentative.html
index c24cfd2398..b85add4b66 100644
--- a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.turbulence.inputTypes.tentative.html
+++ b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.canvasFilterObject.turbulence.inputTypes.tentative.html
@@ -116,12 +116,12 @@ _addTest(function(canvas, ctx) {
 
   for (testCase of errorTestCases) {
     const filterOptions = {...{name: 'turbulence'}, ...testCase};
-    assert_throws_js(TypeError, function() { new CanvasFilter(filterOptions); });
+    assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(filterOptions); });
   }
 
   for (testCase of workingTestCases) {
     const filterOptions = {...{name: 'turbulence'}, ...testCase};
-    _assert(new CanvasFilter(filterOptions) != null, "new CanvasFilter(filterOptions) != null");
+    ctx.filter = new CanvasFilter(filterOptions);
   }
 
 });
diff --git a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.blur.exceptions.html b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.blur.exceptions.html
new file mode 100644
index 0000000000..7176a7d0a4
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.blur.exceptions.html
@@ -0,0 +1,37 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>Canvas test: 2d.filter.layers.blur.exceptions</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+<link rel="stylesheet" href="/html/canvas/resources/canvas-tests.css">
+<body class="show_output">
+
+<h1>2d.filter.layers.blur.exceptions</h1>
+<p class="desc">Test exceptions on gaussianBlur filter</p>
+
+
+<p class="output">Actual output:</p>
+<canvas id="c" class="output" width="100" height="50"><p class="fallback">FAIL (fallback content)</p></canvas>
+
+<ul id="d"></ul>
+<script>
+var t = async_test("Test exceptions on gaussianBlur filter");
+_addTest(function(canvas, ctx) {
+
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'gaussianBlur'}}); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'gaussianBlur', stdDeviation: undefined}}); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'gaussianBlur', stdDeviation: 'foo'}}); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'gaussianBlur', stdDeviation: [1,2,3]}}); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'gaussianBlur', stdDeviation: NaN}}); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'gaussianBlur', stdDeviation: {}}}); });
+
+});
+</script>
+
diff --git a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.colorMatrix.html b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.colorMatrix.html
new file mode 100644
index 0000000000..ef0ae0f949
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.colorMatrix.html
@@ -0,0 +1,104 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>Canvas test: 2d.filter.layers.colorMatrix</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+<link rel="stylesheet" href="/html/canvas/resources/canvas-tests.css">
+<body class="show_output">
+
+<h1>2d.filter.layers.colorMatrix</h1>
+<p class="desc">Test the functionality of ColorMatrix filters</p>
+
+
+<p class="output">Actual output:</p>
+<canvas id="c" class="output" width="100" height="50"><p class="fallback">FAIL (fallback content)</p></canvas>
+
+<ul id="d"></ul>
+<script>
+var t = async_test("Test the functionality of ColorMatrix filters");
+_addTest(function(canvas, ctx) {
+
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'colorMatrix', values: undefined}}); });
+
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'colorMatrix', values: 'foo'}}); });
+
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'colorMatrix', values: null}}); });
+
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'colorMatrix', values: [1, 2, 3]}}); });
+
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'colorMatrix',
+     values: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18,
+              19, 'a']}}); });
+
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'colorMatrix',
+     values: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18,
+              19, Infinity]}}); });
+
+  ctx.fillStyle = '#f00';
+  ctx.beginLayer({filter:
+    {name: 'colorMatrix', type: 'hueRotate', values: 0}});
+  ctx.fillRect(0, 0, 100, 50);
+  ctx.endLayer();
+  _assertPixelApprox(canvas, 10,10, 255,0,0,255, 2);
+
+  ctx.beginLayer({filter:
+    {name: 'colorMatrix', type: 'hueRotate', values: 90}});
+  ctx.fillRect(0, 0, 100, 50);
+  ctx.endLayer();
+  _assertPixelApprox(canvas, 10,10, 0,91,0,255, 2);
+
+  ctx.beginLayer({filter:
+    {name: 'colorMatrix', type: 'hueRotate', values: 180}});
+  ctx.fillRect(0, 0, 100, 50);
+  ctx.endLayer();
+  _assertPixelApprox(canvas, 10,10, 0,109,109,255, 2);
+
+  ctx.beginLayer({filter:
+    {name: 'colorMatrix', type: 'hueRotate', values: 270}});
+  ctx.fillRect(0, 0, 100, 50);
+  ctx.endLayer();
+  _assertPixelApprox(canvas, 10,10, 109,18,255,255, 2);
+
+  ctx.beginLayer({filter:
+    {name: 'colorMatrix', type: 'saturate', values: 0.5}});
+  ctx.fillRect(0, 0, 100, 50);
+  ctx.endLayer();
+  _assertPixelApprox(canvas, 10,10, 155,27,27,255, 2);
+
+  ctx.clearRect(0, 0, 100, 50);
+  ctx.beginLayer({filter:
+    {name: 'colorMatrix', type: 'luminanceToAlpha'}});
+  ctx.fillRect(0, 0, 100, 50);
+  ctx.endLayer();
+  _assertPixelApprox(canvas, 10,10, 0,0,0,54, 2);
+
+  ctx.beginLayer({filter:
+    {name: 'colorMatrix', values: [
+      0, 0, 0, 0, 0,
+      1, 1, 1, 1, 0,
+      0, 0, 0, 0, 0,
+      0, 0, 0, 1, 0
+    ]}});
+  ctx.fillRect(0, 0, 50, 25);
+  ctx.fillStyle = '#0f0';
+  ctx.fillRect(50, 0, 50, 25);
+  ctx.fillStyle = '#00f';
+  ctx.fillRect(0, 25, 50, 25);
+  ctx.fillStyle = '#fff';
+  ctx.fillRect(50, 25, 50, 25);
+  ctx.endLayer();
+  _assertPixelApprox(canvas, 10,10, 0,255,0,255, 2);
+  _assertPixelApprox(canvas, 60,10, 0,255,0,255, 2);
+  _assertPixelApprox(canvas, 10,30, 0,255,0,255, 2);
+  _assertPixelApprox(canvas, 60,30, 0,255,0,255, 2);
+
+});
+</script>
+
diff --git a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.componentTransfer.discrete-expected.html b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.componentTransfer.discrete-expected.html
new file mode 100644
index 0000000000..8419953b3d
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.componentTransfer.discrete-expected.html
@@ -0,0 +1,50 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>Canvas test: 2d.filter.layers.componentTransfer.discrete</title>
+<h1>2d.filter.layers.componentTransfer.discrete</h1>
+<p class="desc">Test pixels on CanvasFilter() componentTransfer with discrete type</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = document.getElementById("canvas");
+  const ctx = canvas.getContext('2d');
+
+  // From https://www.w3.org/TR/SVG11/filters.html#feComponentTransferElement
+  function getTransformedValue(C, V) {
+      // Get the right interval
+      const n = V.length;
+      const k = C == 1 ? n - 1 : Math.floor(C * n);
+      return V[k];
+  }
+
+  function getColor(inputColor, tableValues) {
+      const result = [0, 0, 0];
+      for (const i in inputColor) {
+          const C = inputColor[i]/255;
+          const Cprime = getTransformedValue(C, tableValues[i]);
+          result[i] = Math.max(0, Math.min(1, Cprime)) * 255;
+      }
+      return result;
+  }
+
+  tableValuesR = [0, 0, 1, 1];
+  tableValuesG = [2, 0, 0.5, 3];
+  tableValuesB = [1, -1, 5, 0];
+
+  const inputColors = [
+      [255, 255, 255],
+      [0, 0, 0],
+      [127, 0, 34],
+      [252, 186, 3],
+      [50, 68, 87],
+  ];
+  for (let i = 0 ; i < inputColors.length ; ++i) {
+      const color = inputColors[i];
+      let outputColor = getColor(
+          color, [tableValuesR, tableValuesG, tableValuesB]);
+      ctx.fillStyle = `rgb(${outputColor[0]}, ${outputColor[1]},
+        ${outputColor[2]})`;
+      ctx.fillRect(i * 10, i * 10, 10, 10);
+  }
+</script>
diff --git a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.componentTransfer.discrete.html b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.componentTransfer.discrete.html
new file mode 100644
index 0000000000..ef9db79547
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.componentTransfer.discrete.html
@@ -0,0 +1,38 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<link rel="match" href="2d.filter.layers.componentTransfer.discrete-expected.html">
+<meta name=fuzzy content="maxDifference=0-2; totalPixels=0-500">
+<title>Canvas test: 2d.filter.layers.componentTransfer.discrete</title>
+<h1>2d.filter.layers.componentTransfer.discrete</h1>
+<p class="desc">Test pixels on CanvasFilter() componentTransfer with discrete type</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = document.getElementById("canvas");
+  const ctx = canvas.getContext('2d');
+
+  tableValuesR = [0, 0, 1, 1];
+  tableValuesG = [2, 0, 0.5, 3];
+  tableValuesB = [1, -1, 5, 0];
+  ctx.beginLayer({filter: {name: 'componentTransfer',
+      funcR: {type: 'discrete', tableValues: tableValuesR},
+      funcG: {type: 'discrete', tableValues: tableValuesG},
+      funcB: {type: 'discrete', tableValues: tableValuesB},
+  }});
+
+  const inputColors = [
+      [255, 255, 255],
+      [0, 0, 0],
+      [127, 0, 34],
+      [252, 186, 3],
+      [50, 68, 87],
+  ];
+
+  for (let i = 0 ; i < inputColors.length ; ++i) {
+      const color = inputColors[i];
+      ctx.fillStyle = `rgb(${color[0]}, ${color[1]}, ${color[2]})`;
+      ctx.fillRect(i * 10, i * 10, 10, 10);
+  }
+  ctx.endLayer();
+</script>
diff --git a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.componentTransfer.gamma-expected.html b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.componentTransfer.gamma-expected.html
new file mode 100644
index 0000000000..3e5d980896
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.componentTransfer.gamma-expected.html
@@ -0,0 +1,44 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>Canvas test: 2d.filter.layers.componentTransfer.gamma</title>
+<h1>2d.filter.layers.componentTransfer.gamma</h1>
+<p class="desc">Test pixels on CanvasFilter() componentTransfer with gamma type</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = document.getElementById("canvas");
+  const ctx = canvas.getContext('2d');
+
+  // From https://www.w3.org/TR/SVG11/filters.html#feComponentTransferElement
+  function getColor(inputColor, amplitude, exponent, offset) {
+      return [
+          Math.max(0, Math.min(1, Math.pow(inputColor[0]/255,
+            exponent[0]) * amplitude[0] + offset[0])) * 255,
+          Math.max(0, Math.min(1, Math.pow(inputColor[1]/255,
+            exponent[1]) * amplitude[1] + offset[1])) * 255,
+          Math.max(0, Math.min(1, Math.pow(inputColor[2]/255,
+            exponent[2]) * amplitude[2] + offset[2])) * 255,
+      ];
+  }
+
+  const amplitudes = [2, 1.1, 0.5];
+  const exponents = [5, 3, 1];
+  const offsets = [0.25, 0, 0.5];
+
+  const inputColors = [
+      [255, 255, 255],
+      [0, 0, 0],
+      [127, 0, 34],
+      [252, 186, 3],
+      [50, 68, 87],
+  ];
+
+  for (let i = 0 ; i < inputColors.length ; ++i) {
+      const color = inputColors[i];
+      let outputColor = getColor(color, amplitudes, exponents, offsets);
+      ctx.fillStyle = `rgb(${outputColor[0]}, ${outputColor[1]},
+        ${outputColor[2]})`;
+      ctx.fillRect(i * 10, i * 10, 10, 10);
+  }
+</script>
diff --git a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.componentTransfer.gamma.html b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.componentTransfer.gamma.html
new file mode 100644
index 0000000000..cccd07e92b
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.componentTransfer.gamma.html
@@ -0,0 +1,41 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<link rel="match" href="2d.filter.layers.componentTransfer.gamma-expected.html">
+<meta name=fuzzy content="maxDifference=0-2; totalPixels=0-500">
+<title>Canvas test: 2d.filter.layers.componentTransfer.gamma</title>
+<h1>2d.filter.layers.componentTransfer.gamma</h1>
+<p class="desc">Test pixels on CanvasFilter() componentTransfer with gamma type</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = document.getElementById("canvas");
+  const ctx = canvas.getContext('2d');
+
+  const amplitudes = [2, 1.1, 0.5];
+  const exponents = [5, 3, 1];
+  const offsets = [0.25, 0, 0.5];
+  ctx.beginLayer({filter: {name: 'componentTransfer',
+      funcR: {type: 'gamma', amplitude: amplitudes[0],
+        exponent: exponents[0], offset: offsets[0]},
+      funcG: {type: 'gamma', amplitude: amplitudes[1],
+        exponent: exponents[1], offset: offsets[1]},
+      funcB: {type: 'gamma', amplitude: amplitudes[2],
+        exponent: exponents[2], offset: offsets[2]},
+  }});
+
+  const inputColors = [
+      [255, 255, 255],
+      [0, 0, 0],
+      [127, 0, 34],
+      [252, 186, 3],
+      [50, 68, 87],
+  ];
+
+  for (let i = 0 ; i < inputColors.length ; ++i) {
+      const color = inputColors[i];
+      ctx.fillStyle = `rgb(${color[0]}, ${color[1]}, ${color[2]})`;
+      ctx.fillRect(i * 10, i * 10, 10, 10);
+  }
+  ctx.endLayer();
+</script>
diff --git a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.componentTransfer.identity-expected.html b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.componentTransfer.identity-expected.html
new file mode 100644
index 0000000000..9f1439f37b
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.componentTransfer.identity-expected.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>Canvas test: 2d.filter.layers.componentTransfer.identity</title>
+<h1>2d.filter.layers.componentTransfer.identity</h1>
+<p class="desc">Test pixels on CanvasFilter() componentTransfer with identity type</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = document.getElementById("canvas");
+  const ctx = canvas.getContext('2d');
+
+  const inputColors = [
+      [255, 255, 255],
+      [0, 0, 0],
+      [127, 0, 34],
+      [252, 186, 3],
+      [50, 68, 87],
+  ];
+
+  for (let i = 0 ; i < inputColors.length ; ++i) {
+      let outputColor = inputColors[i];
+      ctx.fillStyle = `rgb(${outputColor[0]}, ${outputColor[1]},
+        ${outputColor[2]})`;
+      ctx.fillRect(i * 10, i * 10, 10, 10);
+  }
+</script>
diff --git a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.componentTransfer.identity.html b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.componentTransfer.identity.html
new file mode 100644
index 0000000000..3a06353849
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.componentTransfer.identity.html
@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<link rel="match" href="2d.filter.layers.componentTransfer.identity-expected.html">
+<title>Canvas test: 2d.filter.layers.componentTransfer.identity</title>
+<h1>2d.filter.layers.componentTransfer.identity</h1>
+<p class="desc">Test pixels on CanvasFilter() componentTransfer with identity type</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = document.getElementById("canvas");
+  const ctx = canvas.getContext('2d');
+
+  ctx.beginLayer({filter: {name: 'componentTransfer',
+      funcR: {type: 'identity'},
+      funcG: {type: 'identity'},
+      funcB: {type: 'identity'},
+  }});
+
+  const inputColors = [
+      [255, 255, 255],
+      [0, 0, 0],
+      [127, 0, 34],
+      [252, 186, 3],
+      [50, 68, 87],
+  ];
+
+  for (let i = 0 ; i < inputColors.length ; ++i) {
+      const color = inputColors[i];
+      ctx.fillStyle = `rgb(${color[0]}, ${color[1]}, ${color[2]})`;
+      ctx.fillRect(i * 10, i * 10, 10, 10);
+  }
+  ctx.endLayer();
+</script>
diff --git a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.componentTransfer.linear-expected.html b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.componentTransfer.linear-expected.html
new file mode 100644
index 0000000000..f922055ff2
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.componentTransfer.linear-expected.html
@@ -0,0 +1,44 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>Canvas test: 2d.filter.layers.componentTransfer.linear</title>
+<h1>2d.filter.layers.componentTransfer.linear</h1>
+<p class="desc">Test pixels on CanvasFilter() componentTransfer with linear type</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = document.getElementById("canvas");
+  const ctx = canvas.getContext('2d');
+
+  // From https://www.w3.org/TR/SVG11/filters.html#feComponentTransferElement
+  function getColor(inputColor, slopes, intercepts) {
+      return [
+          Math.max(0, Math.min(1,
+            inputColor[0]/255 * slopes[0] + intercepts[0])) * 255,
+          Math.max(0, Math.min(1,
+            inputColor[1]/255 * slopes[1] + intercepts[1])) * 255,
+          Math.max(0, Math.min(1,
+            inputColor[2]/255 * slopes[2] + intercepts[2])) * 255,
+      ];
+  }
+
+  const slopes = [0.5, 1.2, -0.2];
+  const intercepts = [0.25, 0, 0.5];
+
+  const inputColors = [
+      [255, 255, 255],
+      [0, 0, 0],
+      [127, 0, 34],
+      [252, 186, 3],
+      [50, 68, 87],
+  ];
+
+  for (let i = 0 ; i < inputColors.length ; ++i) {
+      const color = inputColors[i];
+      let outputColor = getColor(color, slopes, intercepts);
+      ctx.fillStyle = `rgb(${outputColor[0]}, ${outputColor[1]},
+        ${outputColor[2]})`;
+      ctx.fillRect(i * 10, i * 10, 10, 10);
+  }
+  ctx.endLayer();
+</script>
diff --git a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.componentTransfer.linear.html b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.componentTransfer.linear.html
new file mode 100644
index 0000000000..c9e744ebef
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.componentTransfer.linear.html
@@ -0,0 +1,37 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<link rel="match" href="2d.filter.layers.componentTransfer.linear-expected.html">
+<meta name=fuzzy content="maxDifference=0-2; totalPixels=0-500">
+<title>Canvas test: 2d.filter.layers.componentTransfer.linear</title>
+<h1>2d.filter.layers.componentTransfer.linear</h1>
+<p class="desc">Test pixels on CanvasFilter() componentTransfer with linear type</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = document.getElementById("canvas");
+  const ctx = canvas.getContext('2d');
+
+  const slopes = [0.5, 1.2, -0.2];
+  const intercepts = [0.25, 0, 0.5];
+  ctx.beginLayer({filter: {name: 'componentTransfer',
+      funcR: {type: 'linear', slope: slopes[0], intercept: intercepts[0]},
+      funcG: {type: 'linear', slope: slopes[1], intercept: intercepts[1]},
+      funcB: {type: 'linear', slope: slopes[2], intercept: intercepts[2]},
+  }});
+
+  const inputColors = [
+      [255, 255, 255],
+      [0, 0, 0],
+      [127, 0, 34],
+      [252, 186, 3],
+      [50, 68, 87],
+  ];
+
+  for (let i = 0 ; i < inputColors.length ; ++i) {
+      const color = inputColors[i];
+      ctx.fillStyle = `rgb(${color[0]}, ${color[1]}, ${color[2]})`;
+      ctx.fillRect(i * 10, i * 10, 10, 10);
+  }
+  ctx.endLayer();
+</script>
diff --git a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.componentTransfer.table-expected.html b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.componentTransfer.table-expected.html
new file mode 100644
index 0000000000..0f6736d87d
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.componentTransfer.table-expected.html
@@ -0,0 +1,51 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>Canvas test: 2d.filter.layers.componentTransfer.table</title>
+<h1>2d.filter.layers.componentTransfer.table</h1>
+<p class="desc">Test pixels on CanvasFilter() componentTransfer with table type</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = document.getElementById("canvas");
+  const ctx = canvas.getContext('2d');
+
+  // From https://www.w3.org/TR/SVG11/filters.html#feComponentTransferElement
+  function getTransformedValue(C, V) {
+      // Get the right interval
+      const n = V.length - 1;
+      const k = C == 1 ? n - 1 : Math.floor(C * n);
+      return V[k] + (C - k/n) * n * (V[k + 1] - V[k]);
+  }
+
+  function getColor(inputColor, tableValues) {
+      const result = [0, 0, 0];
+      for (const i in inputColor) {
+          const C = inputColor[i]/255;
+          const Cprime = getTransformedValue(C, tableValues[i]);
+          result[i] = Math.max(0, Math.min(1, Cprime)) * 255;
+      }
+      return result;
+  }
+
+  tableValuesR = [0, 0, 1, 1];
+  tableValuesG = [2, 0, 0.5, 3];
+  tableValuesB = [1, -1, 5, 0];
+
+  const inputColors = [
+      [255, 255, 255],
+      [0, 0, 0],
+      [127, 0, 34],
+      [252, 186, 3],
+      [50, 68, 87],
+  ];
+
+  for (let i = 0 ; i < inputColors.length ; ++i) {
+      const color = inputColors[i];
+      let outputColor = getColor(
+          color, [tableValuesR, tableValuesG, tableValuesB]);
+      ctx.fillStyle = `rgb(${outputColor[0]}, ${outputColor[1]},
+        ${outputColor[2]})`;
+      ctx.fillRect(i * 10, i * 10, 10, 10);
+  }
+</script>
diff --git a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.componentTransfer.table.html b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.componentTransfer.table.html
new file mode 100644
index 0000000000..eae036b142
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.componentTransfer.table.html
@@ -0,0 +1,38 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<link rel="match" href="2d.filter.layers.componentTransfer.table-expected.html">
+<meta name=fuzzy content="maxDifference=0-2; totalPixels=0-500">
+<title>Canvas test: 2d.filter.layers.componentTransfer.table</title>
+<h1>2d.filter.layers.componentTransfer.table</h1>
+<p class="desc">Test pixels on CanvasFilter() componentTransfer with table type</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = document.getElementById("canvas");
+  const ctx = canvas.getContext('2d');
+
+  tableValuesR = [0, 0, 1, 1];
+  tableValuesG = [2, 0, 0.5, 3];
+  tableValuesB = [1, -1, 5, 0];
+  ctx.beginLayer({filter: {name: 'componentTransfer',
+      funcR: {type: 'table', tableValues: tableValuesR},
+      funcG: {type: 'table', tableValues: tableValuesG},
+      funcB: {type: 'table', tableValues: tableValuesB},
+  }});
+
+  const inputColors = [
+      [255, 255, 255],
+      [0, 0, 0],
+      [127, 0, 34],
+      [252, 186, 3],
+      [50, 68, 87],
+  ];
+
+  for (let i = 0 ; i < inputColors.length ; ++i) {
+      const color = inputColors[i];
+      ctx.fillStyle = `rgb(${color[0]}, ${color[1]}, ${color[2]})`;
+      ctx.fillRect(i * 10, i * 10, 10, 10);
+  }
+  ctx.endLayer();
+</script>
diff --git a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.convolveMatrix.exceptions.html b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.convolveMatrix.exceptions.html
new file mode 100644
index 0000000000..ae45cb865c
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.convolveMatrix.exceptions.html
@@ -0,0 +1,60 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>Canvas test: 2d.filter.layers.convolveMatrix.exceptions</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+<link rel="stylesheet" href="/html/canvas/resources/canvas-tests.css">
+<body class="show_output">
+
+<h1>2d.filter.layers.convolveMatrix.exceptions</h1>
+<p class="desc">Test exceptions on CanvasFilter() convolveMatrix</p>
+
+
+<p class="output">Actual output:</p>
+<canvas id="c" class="output" width="100" height="50"><p class="fallback">FAIL (fallback content)</p></canvas>
+
+<ul id="d"></ul>
+<script>
+var t = async_test("Test exceptions on CanvasFilter() convolveMatrix");
+_addTest(function(canvas, ctx) {
+
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'convolveMatrix'}}); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'convolveMatrix', divisor: 2}}); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'convolveMatrix', kernelMatrix: null}}); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'convolveMatrix', kernelMatrix: 1}}); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'convolveMatrix', kernelMatrix: [[1, 0], [0]]}}); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'convolveMatrix', kernelMatrix: [[1, 'a'], [0]]}}); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'convolveMatrix', kernelMatrix: [[1, 0], 0]}}); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'convolveMatrix', kernelMatrix: [[1, 0], [0, Infinity]]}}); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'convolveMatrix', kernelMatrix: []}}); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'convolveMatrix', kernelMatrix: [1]}}); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'convolveMatrix', kernelMatrix: [1, 2, 3, 4]}}); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'convolveMatrix', kernelMatrix: [[], []]}}); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'convolveMatrix', kernelMatrix: [[1, 2], []]}}); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'convolveMatrix', kernelMatrix: [[], [1, 2]]}}); });
+  // This should not throw an error
+  ctx.beginLayer({filter:
+    {name: 'convolveMatrix', kernelMatrix: [[]]}});
+  ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'convolveMatrix', kernelMatrix: [[1]]}});
+  ctx.endLayer();
+
+});
+</script>
+
diff --git a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.dropShadow-expected.html b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.dropShadow-expected.html
new file mode 100644
index 0000000000..1719d99b4a
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.dropShadow-expected.html
@@ -0,0 +1,57 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>Canvas test: 2d.filter.layers.dropShadow</title>
+<h1>2d.filter.layers.dropShadow</h1>
+<p class="desc">Test CanvasFilter() dropShadow object.</p>
+
+<svg xmlns="http://www.w3.org/2000/svg"
+     width=520 height=420
+     color-interpolation-filters="sRGB">
+  <rect x=0 y=0 width=100% height=50 fill="teal" />
+  <rect x=0 y=100 width=100% height=50 fill="teal" />
+  <rect x=0 y=200 width=100% height=50 fill="teal" />
+  <rect x=0 y=300 width=100% height=50 fill="teal" />
+
+  <rect x=10 y=10 width=80 height=80 fill="crimson"
+        filter="drop-shadow(2px 2px 2px black)"/>
+  <rect x=110 y=10 width=80 height=80 fill="crimson"
+        filter="drop-shadow(9px 12px 5px rgba(128, 0, 128, 0.7))"/>
+
+  <rect x=10 y=110 width=80 height=80 fill="crimson"
+        filter="drop-shadow(9px 12px 3px purple)"/>
+  <rect x=110 y=110 width=80 height=80 fill="crimson"
+        filter="drop-shadow(9px 12px 3px LinkText)"/>
+  <rect x=210 y=110 width=80 height=80 fill="crimson"
+        filter="drop-shadow(9px 12px 3px rgba(20, 50, 130, 1))"/>
+  <rect x=310 y=110 width=80 height=80 fill="crimson"
+        filter="drop-shadow(9px 12px 3px rgba(20, 50, 130, 0.7))"/>
+  <rect x=410 y=110 width=80 height=80 fill="crimson"
+        filter="drop-shadow(9px 12px 3px rgba(20, 50, 130, 0.49))"/>
+
+  <rect x=10 y=210 width=80 height=80 fill="crimson"
+        filter="drop-shadow(9px 12px 0px purple)"/>
+  <rect x=110 y=210 width=80 height=80 fill="crimson"
+        filter="drop-shadow(9px 12px 5px purple)"/>
+  <rect x=210 y=210 width=80 height=80 fill="crimson"
+        filter="drop-shadow(9px 12px 0px purple)"/>
+  <filter id="separable-filter"
+          x="-100%" y="-100%" width="300%" height="300%">
+    <feDropShadow dx=9 dy=12 stdDeviation="3 5" flood-color="purple"/>
+  </filter>
+  <rect x=310 y=210 width=80 height=80 fill="crimson"
+        filter="url(#separable-filter)"/>
+  <rect x=410 y=210 width=80 height=80 fill="crimson"
+        filter="drop-shadow(9px 12px 0px purple)"/>
+
+  <rect x=10 y=310 width=80 height=80 fill="crimson"
+        filter="drop-shadow(-5px 0px 0px purple)"/>
+  <filter id="separable-filter-degenerate"
+          x="-100%" y="-100%" width="300%" height="300%">
+    <feDropShadow dx=0 dy=5 stdDeviation="0 3"
+        flood-color="rgba(128, 0, 128, 0.8)"/>
+  </filter>
+  <rect x=110 y=310 width=80 height=80 fill="crimson"
+        filter="url(#separable-filter-degenerate)"/>
+  <rect x=210 y=310 width=80 height=80 fill="crimson"
+        filter="drop-shadow(1px 10px 0px rgba(128, 0, 128, 0.4))"/>
+</svg>
diff --git a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.dropShadow.exceptions.html b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.dropShadow.exceptions.html
new file mode 100644
index 0000000000..df5e0c7dc3
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.dropShadow.exceptions.html
@@ -0,0 +1,269 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>Canvas test: 2d.filter.layers.dropShadow.exceptions</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+<link rel="stylesheet" href="/html/canvas/resources/canvas-tests.css">
+<body class="show_output">
+
+<h1>2d.filter.layers.dropShadow.exceptions</h1>
+<p class="desc">Test exceptions on CanvasFilter() dropShadow object</p>
+
+
+<p class="output">Actual output:</p>
+<canvas id="c" class="output" width="100" height="50"><p class="fallback">FAIL (fallback content)</p></canvas>
+
+<ul id="d"></ul>
+<script>
+var t = async_test("Test exceptions on CanvasFilter() dropShadow object");
+_addTest(function(canvas, ctx) {
+
+  // Should not throw an error.
+  // dx
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: 10}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: -1}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: 0.5}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: null}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: true}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: false}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: []}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: [20]}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: '30'}}); ctx.endLayer();
+  // dy
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: 10}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: -1}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: 0.5}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: null}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: true}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: false}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: []}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: [20]}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: '30'}}); ctx.endLayer();
+  // floodOpacity
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: 10}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: -1}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: 0.5}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: null}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: true}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: false}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: []}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: [20]}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: '30'}}); ctx.endLayer();
+  // dx
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: 10}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: -1}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: 0.5}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: null}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: true}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: false}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: []}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: [20]}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: '30'}}); ctx.endLayer();
+  // dy
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: 10}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: -1}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: 0.5}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: null}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: true}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: false}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: []}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: [20]}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: '30'}}); ctx.endLayer();
+  // floodOpacity
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: 10}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: -1}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: 0.5}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: null}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: true}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: false}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: []}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: [20]}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: '30'}}); ctx.endLayer();
+  // stdDeviation
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: 10}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: -1}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: 0.5}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: null}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: true}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: false}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: []}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: [20]}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: '30'}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: [10, -1]}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: [0.5, null]}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: [true, false]}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: [[], [20]]}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: ['30', ['40']]}}); ctx.endLayer();
+  // floodColor
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', floodColor: 'red'}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', floodColor: 'canvas'}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', floodColor: 'rgba(4, -3, 0.5, 1)'}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', floodColor: '#aabbccdd'}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', floodColor: '#abcd'}}); ctx.endLayer();
+
+  // Should throw a TypeError.
+  // dx
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: NaN}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: Infinity}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: -Infinity}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: undefined}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: 'test'}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: {}}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: [1, 2]}}); ctx.endLayer(); });
+  // dy
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: NaN}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: Infinity}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: -Infinity}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: undefined}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: 'test'}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: {}}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: [1, 2]}}); ctx.endLayer(); });
+  // floodOpacity
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: NaN}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: Infinity}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: -Infinity}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: undefined}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: 'test'}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: {}}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: [1, 2]}}); ctx.endLayer(); });
+  // stdDeviation
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: NaN}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: Infinity}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: -Infinity}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: undefined}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: 'test'}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: {}}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: [1, 2, 3]}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: [1, NaN]}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: [1, Infinity]}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: [1, -Infinity]}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: [1, undefined]}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: [1, 'test']}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: [1, {}]}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: [1, [2, 3]]}}); ctx.endLayer(); });
+  // floodColor
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', floodColor: 'test'}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', floodColor: 'rgba(NaN, 3, 2, 1)'}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', floodColor: 10}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', floodColor: undefined}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', floodColor: null}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', floodColor: NaN}}); ctx.endLayer(); });
+
+});
+</script>
+
diff --git a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.dropShadow.html b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.dropShadow.html
new file mode 100644
index 0000000000..ceb20bb9eb
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.dropShadow.html
@@ -0,0 +1,94 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<link rel="match" href="2d.filter.layers.dropShadow-expected.html">
+<title>Canvas test: 2d.filter.layers.dropShadow</title>
+<h1>2d.filter.layers.dropShadow</h1>
+<p class="desc">Test CanvasFilter() dropShadow object.</p>
+<canvas id="canvas" width="520" height="420">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = document.getElementById("canvas");
+  const ctx = canvas.getContext('2d');
+
+  ctx.fillStyle = 'teal';
+  ctx.fillRect(0, 0, 520, 50);
+  ctx.fillRect(0, 100, 520, 50);
+  ctx.fillRect(0, 200, 520, 50);
+  ctx.fillRect(0, 300, 520, 50);
+
+  ctx.fillStyle = 'crimson';
+
+  // Parameter defaults.
+  ctx.beginLayer({filter: {name: 'dropShadow'}});
+  ctx.fillRect(10, 10, 80, 80);
+  ctx.endLayer();
+  // All parameters specified.
+  ctx.beginLayer({filter: {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 5,
+     floodColor: 'purple', floodOpacity: 0.7}});
+  ctx.fillRect(110, 10, 80, 80);
+  ctx.endLayer();
+  // Named color.
+  ctx.beginLayer({filter: {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 3,
+     floodColor: 'purple'}});
+  ctx.fillRect(10, 110, 80, 80);
+  ctx.endLayer();
+  // System color.
+  ctx.beginLayer({filter: {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 3,
+     floodColor: 'LinkText'}});
+  ctx.fillRect(110, 110, 80, 80);
+  ctx.endLayer();
+  // Numerical color.
+  ctx.beginLayer({filter: {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 3,
+     floodColor: 'rgba(20, 50, 130, 1)'}});
+  ctx.fillRect(210, 110, 80, 80);
+  ctx.endLayer();
+  // Transparent floodColor.
+  ctx.beginLayer({filter: {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 3,
+     floodColor: 'rgba(20, 50, 130, 0.7)'}});
+  ctx.fillRect(310, 110, 80, 80);
+  ctx.endLayer();
+  // Transparent floodColor and floodOpacity.
+  ctx.beginLayer({filter: {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 3,
+     floodColor: 'rgba(20, 50, 130, 0.7)', floodOpacity: 0.7}});
+  ctx.fillRect(410, 110, 80, 80);
+  ctx.endLayer();
+  // No blur.
+  ctx.beginLayer({filter: {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 0,
+     floodColor: 'purple'}});
+  ctx.fillRect(10, 210, 80, 80);
+  ctx.endLayer();
+  // Single float blur.
+  ctx.beginLayer({filter: {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 5,
+     floodColor: 'purple'}});
+  ctx.fillRect(110, 210, 80, 80);
+  ctx.endLayer();
+  // Single negative float blur.
+  ctx.beginLayer({filter: {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: -5,
+     floodColor: 'purple'}});
+  ctx.fillRect(210, 210, 80, 80);
+  ctx.endLayer();
+  // Two floats (X&Y) blur.
+  ctx.beginLayer({filter: {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: [3, 5],
+     floodColor: 'purple'}});
+  ctx.fillRect(310, 210, 80, 80);
+  ctx.endLayer();
+  // Two negative floats (X&Y) blur.
+  ctx.beginLayer({filter: {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: [-3, -5],
+     floodColor: 'purple'}});
+  ctx.fillRect(410, 210, 80, 80);
+  ctx.endLayer();
+  // Degenerate parameter values.
+  ctx.beginLayer({filter: {name: 'dropShadow', dx: [-5], dy: [], stdDeviation: null,
+     floodColor: 'purple', floodOpacity: [2]}});
+  ctx.fillRect(10, 310, 80, 80);
+  ctx.endLayer();
+  ctx.beginLayer({filter: {name: 'dropShadow', dx: null, dy: '5', stdDeviation: [[-5], ['3']],
+     floodColor: 'purple', floodOpacity: '0.8'}});
+  ctx.fillRect(110, 310, 80, 80);
+  ctx.endLayer();
+  ctx.beginLayer({filter: {name: 'dropShadow', dx: true, dy: ['10'], stdDeviation: false,
+     floodColor: 'purple', floodOpacity: ['0.4']}});
+  ctx.fillRect(210, 310, 80, 80);
+  ctx.endLayer();
+</script>
diff --git a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.gaussianBlur.isotropic-expected.html b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.gaussianBlur.isotropic-expected.html
new file mode 100644
index 0000000000..4f93754862
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.gaussianBlur.isotropic-expected.html
@@ -0,0 +1,15 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>Canvas test: 2d.filter.layers.gaussianBlur.isotropic</title>
+<h1>2d.filter.layers.gaussianBlur.isotropic</h1>
+<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
+
+<svg xmlns="http://www.w3.org/2000/svg"
+     width="100" height="100"
+     color-interpolation-filters="sRGB">
+  <filter id="blur" x="-50%" y="-50%" width="200%" height="200%">
+    <feGaussianBlur stdDeviation="4 4" />
+  </filter>
+  <rect x="25" y="25" width="50" height="50"
+        fill="teal" filter="url(#blur)" />
+</svg>
diff --git a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.gaussianBlur.isotropic.html b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.gaussianBlur.isotropic.html
new file mode 100644
index 0000000000..a2cc098896
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.gaussianBlur.isotropic.html
@@ -0,0 +1,21 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<link rel="match" href="2d.filter.layers.gaussianBlur.isotropic-expected.html">
+<title>Canvas test: 2d.filter.layers.gaussianBlur.isotropic</title>
+<h1>2d.filter.layers.gaussianBlur.isotropic</h1>
+<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = document.getElementById("canvas");
+  const ctx = canvas.getContext('2d');
+
+  ctx.fillStyle = 'teal';
+  ctx.beginLayer({filter: {
+      name: 'gaussianBlur',
+      stdDeviation: [4, 4],
+  }});
+  ctx.fillRect(25, 25, 50, 50);
+  ctx.endLayer();
+</script>
diff --git a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.gaussianBlur.mostly-x-expected.html b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.gaussianBlur.mostly-x-expected.html
new file mode 100644
index 0000000000..255270c192
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.gaussianBlur.mostly-x-expected.html
@@ -0,0 +1,15 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>Canvas test: 2d.filter.layers.gaussianBlur.mostly-x</title>
+<h1>2d.filter.layers.gaussianBlur.mostly-x</h1>
+<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
+
+<svg xmlns="http://www.w3.org/2000/svg"
+     width="100" height="100"
+     color-interpolation-filters="sRGB">
+  <filter id="blur" x="-50%" y="-50%" width="200%" height="200%">
+    <feGaussianBlur stdDeviation="4 1" />
+  </filter>
+  <rect x="25" y="25" width="50" height="50"
+        fill="teal" filter="url(#blur)" />
+</svg>
diff --git a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.gaussianBlur.mostly-x.html b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.gaussianBlur.mostly-x.html
new file mode 100644
index 0000000000..0090e0e71e
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.gaussianBlur.mostly-x.html
@@ -0,0 +1,21 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<link rel="match" href="2d.filter.layers.gaussianBlur.mostly-x-expected.html">
+<title>Canvas test: 2d.filter.layers.gaussianBlur.mostly-x</title>
+<h1>2d.filter.layers.gaussianBlur.mostly-x</h1>
+<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = document.getElementById("canvas");
+  const ctx = canvas.getContext('2d');
+
+  ctx.fillStyle = 'teal';
+  ctx.beginLayer({filter: {
+      name: 'gaussianBlur',
+      stdDeviation: [4, 1],
+  }});
+  ctx.fillRect(25, 25, 50, 50);
+  ctx.endLayer();
+</script>
diff --git a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.gaussianBlur.mostly-y-expected.html b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.gaussianBlur.mostly-y-expected.html
new file mode 100644
index 0000000000..76a46b1533
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.gaussianBlur.mostly-y-expected.html
@@ -0,0 +1,15 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>Canvas test: 2d.filter.layers.gaussianBlur.mostly-y</title>
+<h1>2d.filter.layers.gaussianBlur.mostly-y</h1>
+<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
+
+<svg xmlns="http://www.w3.org/2000/svg"
+     width="100" height="100"
+     color-interpolation-filters="sRGB">
+  <filter id="blur" x="-50%" y="-50%" width="200%" height="200%">
+    <feGaussianBlur stdDeviation="1 4" />
+  </filter>
+  <rect x="25" y="25" width="50" height="50"
+        fill="teal" filter="url(#blur)" />
+</svg>
diff --git a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.gaussianBlur.mostly-y.html b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.gaussianBlur.mostly-y.html
new file mode 100644
index 0000000000..5c481cbe25
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.gaussianBlur.mostly-y.html
@@ -0,0 +1,21 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<link rel="match" href="2d.filter.layers.gaussianBlur.mostly-y-expected.html">
+<title>Canvas test: 2d.filter.layers.gaussianBlur.mostly-y</title>
+<h1>2d.filter.layers.gaussianBlur.mostly-y</h1>
+<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = document.getElementById("canvas");
+  const ctx = canvas.getContext('2d');
+
+  ctx.fillStyle = 'teal';
+  ctx.beginLayer({filter: {
+      name: 'gaussianBlur',
+      stdDeviation: [1, 4],
+  }});
+  ctx.fillRect(25, 25, 50, 50);
+  ctx.endLayer();
+</script>
diff --git a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.gaussianBlur.x-only-expected.html b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.gaussianBlur.x-only-expected.html
new file mode 100644
index 0000000000..26741f9847
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.gaussianBlur.x-only-expected.html
@@ -0,0 +1,15 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>Canvas test: 2d.filter.layers.gaussianBlur.x-only</title>
+<h1>2d.filter.layers.gaussianBlur.x-only</h1>
+<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
+
+<svg xmlns="http://www.w3.org/2000/svg"
+     width="100" height="100"
+     color-interpolation-filters="sRGB">
+  <filter id="blur" x="-50%" y="-50%" width="200%" height="200%">
+    <feGaussianBlur stdDeviation="4 0" />
+  </filter>
+  <rect x="25" y="25" width="50" height="50"
+        fill="teal" filter="url(#blur)" />
+</svg>
diff --git a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.gaussianBlur.x-only.html b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.gaussianBlur.x-only.html
new file mode 100644
index 0000000000..f7940eb921
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.gaussianBlur.x-only.html
@@ -0,0 +1,21 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<link rel="match" href="2d.filter.layers.gaussianBlur.x-only-expected.html">
+<title>Canvas test: 2d.filter.layers.gaussianBlur.x-only</title>
+<h1>2d.filter.layers.gaussianBlur.x-only</h1>
+<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = document.getElementById("canvas");
+  const ctx = canvas.getContext('2d');
+
+  ctx.fillStyle = 'teal';
+  ctx.beginLayer({filter: {
+      name: 'gaussianBlur',
+      stdDeviation: [4, 0],
+  }});
+  ctx.fillRect(25, 25, 50, 50);
+  ctx.endLayer();
+</script>
diff --git a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.gaussianBlur.y-only-expected.html b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.gaussianBlur.y-only-expected.html
new file mode 100644
index 0000000000..d00eec6b57
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.gaussianBlur.y-only-expected.html
@@ -0,0 +1,15 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>Canvas test: 2d.filter.layers.gaussianBlur.y-only</title>
+<h1>2d.filter.layers.gaussianBlur.y-only</h1>
+<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
+
+<svg xmlns="http://www.w3.org/2000/svg"
+     width="100" height="100"
+     color-interpolation-filters="sRGB">
+  <filter id="blur" x="-50%" y="-50%" width="200%" height="200%">
+    <feGaussianBlur stdDeviation="0 4" />
+  </filter>
+  <rect x="25" y="25" width="50" height="50"
+        fill="teal" filter="url(#blur)" />
+</svg>
diff --git a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.gaussianBlur.y-only.html b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.gaussianBlur.y-only.html
new file mode 100644
index 0000000000..59421a1ff3
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.gaussianBlur.y-only.html
@@ -0,0 +1,21 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<link rel="match" href="2d.filter.layers.gaussianBlur.y-only-expected.html">
+<title>Canvas test: 2d.filter.layers.gaussianBlur.y-only</title>
+<h1>2d.filter.layers.gaussianBlur.y-only</h1>
+<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = document.getElementById("canvas");
+  const ctx = canvas.getContext('2d');
+
+  ctx.fillStyle = 'teal';
+  ctx.beginLayer({filter: {
+      name: 'gaussianBlur',
+      stdDeviation: [0, 4],
+  }});
+  ctx.fillRect(25, 25, 50, 50);
+  ctx.endLayer();
+</script>
diff --git a/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.turbulence.inputTypes.html b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.turbulence.inputTypes.html
new file mode 100644
index 0000000000..26dceaae16
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/element/filters/2d.filter.layers.turbulence.inputTypes.html
@@ -0,0 +1,130 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>Canvas test: 2d.filter.layers.turbulence.inputTypes</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+<link rel="stylesheet" href="/html/canvas/resources/canvas-tests.css">
+<body class="show_output">
+
+<h1>2d.filter.layers.turbulence.inputTypes</h1>
+<p class="desc">Test exceptions on CanvasFilter() turbulence object</p>
+
+
+<p class="output">Actual output:</p>
+<canvas id="c" class="output" width="100" height="50"><p class="fallback">FAIL (fallback content)</p></canvas>
+
+<ul id="d"></ul>
+<script>
+var t = async_test("Test exceptions on CanvasFilter() turbulence object");
+_addTest(function(canvas, ctx) {
+
+  const errorTestCases = [
+    {baseFrequency: {}},
+    {baseFrequency: -1},
+    {baseFrequency: [0, -1]},
+    {baseFrequency: NaN},
+    {baseFrequency: Infinity},
+    {baseFrequency: undefined},
+    {baseFrequency: -Infinity},
+    {baseFrequency: 'test'},
+
+    {numOctaves: {}},
+    {numOctaves: -1},
+    {numOctaves: NaN},
+    {numOctaves: Infinity},
+    {numOctaves: undefined},
+    {numOctaves: -Infinity},
+    {numOctaves: [1, 1]},
+    {numOctaves: 'test'},
+
+    {seed: {}},
+    {seed: NaN},
+    {seed: Infinity},
+    {seed: undefined},
+    {seed: -Infinity},
+    {seed: [1, 1]},
+    {seed: 'test'},
+
+    {stitchTiles: {}},
+    {stitchTiles: NaN},
+    {stitchTiles: Infinity},
+    {stitchTiles: undefined},
+    {stitchTiles: -Infinity},
+    {stitchTiles: [1, 1]},
+    {stitchTiles: 'test'},
+    {stitchTiles: null},
+    {stitchTiles: []},
+    {stitchTiles: [10]},
+    {stitchTiles: 30},
+    {stitchTiles: false},
+    {stitchTiles: true},
+    {stitchTiles: '10'},
+    {stitchTiles: -1},
+
+    {type: {}},
+    {type: NaN},
+    {type: Infinity},
+    {type: undefined},
+    {type: -Infinity},
+    {type: [1, 1]},
+    {type: 'test'},
+    {type: null},
+    {type: []},
+    {type: [10]},
+    {type: 30},
+    {type: false},
+    {type: true},
+    {type: '10'},
+    {type: -1},
+  ]
+
+  // null and [] = 0 when parsed as number
+  const workingTestCases = [
+    {baseFrequency: null},
+    {baseFrequency: []},
+    {baseFrequency: [10]},
+    {baseFrequency: [10, 3]},
+    {baseFrequency: 30},
+    {baseFrequency: false},
+    {baseFrequency: true},
+    {baseFrequency: '10'},
+
+    {numOctaves: null},
+    {numOctaves: []},
+    {numOctaves: [10]},
+    {numOctaves: 30},
+    {numOctaves: false},
+    {numOctaves: true},
+    {numOctaves: '10'},
+
+    {seed: null},
+    {seed: []},
+    {seed: [10]},
+    {seed: 30},
+    {seed: false},
+    {seed: true},
+    {seed: '10'},
+    {seed: -1},
+
+    {stitchTiles: 'stitch'},
+    {stitchTiles: 'noStitch'},
+
+    {type: 'fractalNoise'},
+    {type: 'turbulence'},
+  ]
+
+  for (testCase of errorTestCases) {
+    const filterOptions = {...{name: 'turbulence'}, ...testCase};
+    assert_throws_js(TypeError, function() { ctx.beginLayer({filter: filterOptions}); });
+  }
+
+  for (testCase of workingTestCases) {
+    const filterOptions = {...{name: 'turbulence'}, ...testCase};
+    ctx.beginLayer({filter: filterOptions});
+    ctx.endLayer();
+  }
+
+});
+</script>
+
diff --git a/testing/web-platform/tests/html/canvas/element/layers/2d.layer.ctm.filter-expected.html b/testing/web-platform/tests/html/canvas/element/layers/2d.layer.ctm.filter-expected.html
new file mode 100644
index 0000000000..5fc1ac9acd
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/element/layers/2d.layer.ctm.filter-expected.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>Canvas test: 2d.layer.ctm.filter</title>
+<h1>2d.layer.ctm.filter</h1>
+<p class="desc">Checks that parent transforms affect layer filters.</p>
+
+<svg xmlns="http://www.w3.org/2000/svg"
+      width="200" height="200"
+      color-interpolation-filters="sRGB">
+  <filter id="filter" x="-100%" y="-100%" width="300%" height="300%">
+    <feDropShadow dx="5" dy="5" stdDeviation="0" flood-color="grey" />
+  </filter>
+
+  <g filter="url(#filter)">
+    <g transform="translate(30, 90) scale(2) rotate(90)">
+      <rect x="-30" y="-5" width=60 height=10></rect>
+    </g>
+  </g>
+
+  <g transform="translate(80, 90) scale(2) rotate(90)">
+    <g filter="url(#filter)">
+      <rect x="-30" y="-5" width=60 height=10></rect>
+    </g>
+  </g>
+</svg>
diff --git a/testing/web-platform/tests/html/canvas/element/layers/2d.layer.ctm.filter.html b/testing/web-platform/tests/html/canvas/element/layers/2d.layer.ctm.filter.html
new file mode 100644
index 0000000000..3d56ac3601
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/element/layers/2d.layer.ctm.filter.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<link rel="match" href="2d.layer.ctm.filter-expected.html">
+<title>Canvas test: 2d.layer.ctm.filter</title>
+<h1>2d.layer.ctm.filter</h1>
+<p class="desc">Checks that parent transforms affect layer filters.</p>
+<canvas id="canvas" width="200" height="200">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = document.getElementById("canvas");
+  const ctx = canvas.getContext('2d');
+
+  // Transforms inside the layer should not apply to the layer's filter.
+  ctx.beginLayer({filter: 'drop-shadow(5px 5px 0px grey)'});
+  ctx.translate(30, 90);
+  ctx.scale(2, 2);
+  ctx.rotate(Math.PI / 2);
+  ctx.fillRect(-30, -5, 60, 10);
+  ctx.endLayer();
+
+  // Transforms in the layer's parent should apply to the layer's filter.
+  ctx.translate(80, 90);
+  ctx.scale(2, 2);
+  ctx.rotate(Math.PI / 2);
+  ctx.beginLayer({filter: 'drop-shadow(5px 5px 0px grey)'});
+  ctx.fillRect(-30, -5, 60, 10);
+  ctx.endLayer();
+</script>
diff --git a/testing/web-platform/tests/html/canvas/element/layers/2d.layer.ctm.getTransform.html b/testing/web-platform/tests/html/canvas/element/layers/2d.layer.ctm.getTransform.html
new file mode 100644
index 0000000000..7a69c59527
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/element/layers/2d.layer.ctm.getTransform.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>Canvas test: 2d.layer.ctm.getTransform</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+<link rel="stylesheet" href="/html/canvas/resources/canvas-tests.css">
+<body class="show_output">
+
+<h1>2d.layer.ctm.getTransform</h1>
+<p class="desc">Tests getTransform inside layers.</p>
+
+
+<p class="output">Actual output:</p>
+<canvas id="c" class="output" width="100" height="50"><p class="fallback">FAIL (fallback content)</p></canvas>
+
+<ul id="d"></ul>
+<script>
+var t = async_test("Tests getTransform inside layers.");
+_addTest(function(canvas, ctx) {
+
+  ctx.translate(10, 20);
+  ctx.beginLayer();
+  ctx.scale(2, 3);
+  const m = ctx.getTransform();
+  assert_array_equals([m.a, m.b, m.c, m.d, m.e, m.f], [2, 0, 0, 3, 10, 20]);
+  ctx.endLayer();
+
+});
+</script>
+
diff --git a/testing/web-platform/tests/html/canvas/element/layers/2d.layer.ctm.resetTransform-expected.html b/testing/web-platform/tests/html/canvas/element/layers/2d.layer.ctm.resetTransform-expected.html
new file mode 100644
index 0000000000..fd4c1746c7
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/element/layers/2d.layer.ctm.resetTransform-expected.html
@@ -0,0 +1,19 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>Canvas test: 2d.layer.ctm.resetTransform</title>
+<h1>2d.layer.ctm.resetTransform</h1>
+<p class="desc">Tests resetTransform inside layers.</p>
+<canvas id="canvas" width="100" height="50">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = document.getElementById("canvas");
+  const ctx = canvas.getContext('2d');
+
+  ctx.fillStyle = 'blue';
+  ctx.fillRect(0, 0, 20, 20);
+
+  ctx.translate(40, 0);
+  ctx.fillStyle = 'green';
+  ctx.fillRect(0, 0, 20, 20);
+</script>
diff --git a/testing/web-platform/tests/html/canvas/element/layers/2d.layer.ctm.resetTransform.html b/testing/web-platform/tests/html/canvas/element/layers/2d.layer.ctm.resetTransform.html
new file mode 100644
index 0000000000..9291f8f3f2
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/element/layers/2d.layer.ctm.resetTransform.html
@@ -0,0 +1,28 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<link rel="match" href="2d.layer.ctm.resetTransform-expected.html">
+<title>Canvas test: 2d.layer.ctm.resetTransform</title>
+<h1>2d.layer.ctm.resetTransform</h1>
+<p class="desc">Tests resetTransform inside layers.</p>
+<canvas id="canvas" width="100" height="50">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = document.getElementById("canvas");
+  const ctx = canvas.getContext('2d');
+
+  ctx.translate(40, 0);
+
+  ctx.beginLayer();
+  ctx.rotate(2);
+  ctx.beginLayer();
+  ctx.scale(5, 6);
+  ctx.resetTransform();
+  ctx.fillStyle = 'blue';
+  ctx.fillRect(0, 0, 20, 20);
+  ctx.endLayer();
+  ctx.endLayer();
+
+  ctx.fillStyle = 'green';
+  ctx.fillRect(0, 0, 20, 20);
+</script>
diff --git a/testing/web-platform/tests/html/canvas/element/layers/2d.layer.ctm.setTransform-expected.html b/testing/web-platform/tests/html/canvas/element/layers/2d.layer.ctm.setTransform-expected.html
new file mode 100644
index 0000000000..45a3d095e1
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/element/layers/2d.layer.ctm.setTransform-expected.html
@@ -0,0 +1,20 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>Canvas test: 2d.layer.ctm.setTransform</title>
+<h1>2d.layer.ctm.setTransform</h1>
+<p class="desc">Tests setTransform inside layers.</p>
+<canvas id="canvas" width="100" height="50">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = document.getElementById("canvas");
+  const ctx = canvas.getContext('2d');
+
+  ctx.translate(80, 0);
+  ctx.fillStyle = 'green';
+  ctx.fillRect(0, 0, 20, 20);
+
+  ctx.setTransform(4, 0, 0, 2, 20, 10);
+  ctx.fillStyle = 'blue';
+  ctx.fillRect(0, 0, 10, 10);
+</script>
diff --git a/testing/web-platform/tests/html/canvas/element/layers/2d.layer.ctm.setTransform.html b/testing/web-platform/tests/html/canvas/element/layers/2d.layer.ctm.setTransform.html
new file mode 100644
index 0000000000..b5d98ba45f
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/element/layers/2d.layer.ctm.setTransform.html
@@ -0,0 +1,28 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<link rel="match" href="2d.layer.ctm.setTransform-expected.html">
+<title>Canvas test: 2d.layer.ctm.setTransform</title>
+<h1>2d.layer.ctm.setTransform</h1>
+<p class="desc">Tests setTransform inside layers.</p>
+<canvas id="canvas" width="100" height="50">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = document.getElementById("canvas");
+  const ctx = canvas.getContext('2d');
+
+  ctx.translate(80, 0);
+
+  ctx.beginLayer();
+  ctx.rotate(2);
+  ctx.beginLayer();
+  ctx.scale(5, 6);
+  ctx.setTransform(4, 0, 0, 2, 20, 10);
+  ctx.fillStyle = 'blue';
+  ctx.fillRect(0, 0, 10, 10);
+  ctx.endLayer();
+  ctx.endLayer();
+
+  ctx.fillStyle = 'green';
+  ctx.fillRect(0, 0, 20, 20);
+</script>
diff --git a/testing/web-platform/tests/html/canvas/element/layers/2d.layer.ctm.shadow-in-transformed-layer-expected.html b/testing/web-platform/tests/html/canvas/element/layers/2d.layer.ctm.shadow-in-transformed-layer-expected.html
new file mode 100644
index 0000000000..312ca19b4c
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/element/layers/2d.layer.ctm.shadow-in-transformed-layer-expected.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>Canvas test: 2d.layer.ctm.shadow-in-transformed-layer</title>
+<h1>2d.layer.ctm.shadow-in-transformed-layer</h1>
+<p class="desc">Check shadows inside of a transformed layer.</p>
+<canvas id="canvas" width="200" height="200">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = document.getElementById("canvas");
+  const ctx = canvas.getContext('2d');
+
+  ctx.translate(80, 90);
+  ctx.scale(2, 2);
+  ctx.rotate(Math.PI / 2);
+
+  ctx.shadowOffsetX = 10;
+  ctx.shadowOffsetY = 10;
+  ctx.shadowColor = 'grey';
+  ctx.fillRect(-30, -5, 60, 10);
+
+  const canvas2 = new OffscreenCanvas(100, 100);
+  const ctx2 = canvas2.getContext('2d');
+  ctx2.fillStyle = 'blue';
+  ctx2.fillRect(0, 0, 40, 10);
+  ctx.drawImage(canvas2, -30, -30);
+</script>
diff --git a/testing/web-platform/tests/html/canvas/element/layers/2d.layer.ctm.shadow-in-transformed-layer.html b/testing/web-platform/tests/html/canvas/element/layers/2d.layer.ctm.shadow-in-transformed-layer.html
new file mode 100644
index 0000000000..f047bd30b2
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/element/layers/2d.layer.ctm.shadow-in-transformed-layer.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<link rel="match" href="2d.layer.ctm.shadow-in-transformed-layer-expected.html">
+<title>Canvas test: 2d.layer.ctm.shadow-in-transformed-layer</title>
+<h1>2d.layer.ctm.shadow-in-transformed-layer</h1>
+<p class="desc">Check shadows inside of a transformed layer.</p>
+<canvas id="canvas" width="200" height="200">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = document.getElementById("canvas");
+  const ctx = canvas.getContext('2d');
+
+  ctx.translate(80, 90);
+  ctx.scale(2, 2);
+  ctx.rotate(Math.PI / 2);
+
+  ctx.beginLayer();
+  ctx.shadowOffsetX = 10;
+  ctx.shadowOffsetY = 10;
+  ctx.shadowColor = 'grey';
+  ctx.fillRect(-30, -5, 60, 10);
+
+  const canvas2 = new OffscreenCanvas(100, 100);
+  const ctx2 = canvas2.getContext('2d');
+  ctx2.fillStyle = 'blue';
+  ctx2.fillRect(0, 0, 40, 10);
+  ctx.drawImage(canvas2, -30, -30);
+
+  ctx.endLayer();
+</script>
diff --git a/testing/web-platform/tests/html/canvas/element/layers/2d.layer.drawImage-expected.html b/testing/web-platform/tests/html/canvas/element/layers/2d.layer.drawImage-expected.html
new file mode 100644
index 0000000000..26f6e75214
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/element/layers/2d.layer.drawImage-expected.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>Canvas test: 2d.layer.drawImage</title>
+<h1>2d.layer.drawImage</h1>
+<p class="desc">Checks that drawImage writes the image to the layer and not the parent directly.</p>
+<canvas id="canvas" width="200" height="200">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = document.getElementById("canvas");
+  const ctx = canvas.getContext('2d');
+
+  ctx.fillStyle = 'skyblue';
+  ctx.fillRect(0, 0, 100, 100);
+
+  ctx.beginLayer({filter: {name: 'dropShadow', dx: -10, dy: -10,
+    stdDeviation: 0, floodColor: 'navy'}});
+
+  ctx.fillStyle = 'maroon';
+  ctx.fillRect(20, 20, 50, 50);
+
+  ctx.globalCompositeOperation = 'xor';
+
+  // Should xor only with the layer content, not the parents'.
+  ctx.fillStyle = 'pink';
+  ctx.fillRect(40, 40, 50, 50);
+
+  ctx.endLayer();
+</script>
diff --git a/testing/web-platform/tests/html/canvas/element/layers/2d.layer.drawImage.html b/testing/web-platform/tests/html/canvas/element/layers/2d.layer.drawImage.html
new file mode 100644
index 0000000000..58206c3eb8
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/element/layers/2d.layer.drawImage.html
@@ -0,0 +1,33 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<link rel="match" href="2d.layer.drawImage-expected.html">
+<title>Canvas test: 2d.layer.drawImage</title>
+<h1>2d.layer.drawImage</h1>
+<p class="desc">Checks that drawImage writes the image to the layer and not the parent directly.</p>
+<canvas id="canvas" width="200" height="200">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = document.getElementById("canvas");
+  const ctx = canvas.getContext('2d');
+
+  ctx.fillStyle = 'skyblue';
+  ctx.fillRect(0, 0, 100, 100);
+
+  ctx.beginLayer({filter: {name: 'dropShadow', dx: -10, dy: -10,
+    stdDeviation: 0, floodColor: 'navy'}});
+
+  ctx.fillStyle = 'maroon';
+  ctx.fillRect(20, 20, 50, 50);
+
+  ctx.globalCompositeOperation = 'xor';
+
+  // The image should xor only with the layer content, not the parents'.
+  const canvas_image = new OffscreenCanvas(200,200);
+  const ctx_image = canvas_image.getContext("2d");
+  ctx_image.fillStyle = 'pink';
+  ctx_image.fillRect(40, 40, 50, 50);
+  ctx.drawImage(canvas_image, 0, 0);
+
+  ctx.endLayer();
+</script>
diff --git a/testing/web-platform/tests/html/canvas/element/layers/2d.layer.global-states.filter.alpha.blending.html b/testing/web-platform/tests/html/canvas/element/layers/2d.layer.global-states.filter.alpha.blending.html
index 17e0f0c8c5..98ea67e9e9 100644
--- a/testing/web-platform/tests/html/canvas/element/layers/2d.layer.global-states.filter.alpha.blending.html
+++ b/testing/web-platform/tests/html/canvas/element/layers/2d.layer.global-states.filter.alpha.blending.html
@@ -1,6 +1,7 @@
 <!DOCTYPE html>
 <!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
 <link rel="match" href="2d.layer.global-states.filter.alpha.blending-expected.html">
+<meta name=fuzzy content="maxDifference=0-1; totalPixels=0-2453">
 <title>Canvas test: 2d.layer.global-states.filter.alpha.blending</title>
 <h1>2d.layer.global-states.filter.alpha.blending</h1>
 <p class="desc">Checks that layers with filters correctly use global render states.</p>
diff --git a/testing/web-platform/tests/html/canvas/element/layers/2d.layer.global-states.filter.alpha.composite.html b/testing/web-platform/tests/html/canvas/element/layers/2d.layer.global-states.filter.alpha.composite.html
index 71a27cf710..29041d4933 100644
--- a/testing/web-platform/tests/html/canvas/element/layers/2d.layer.global-states.filter.alpha.composite.html
+++ b/testing/web-platform/tests/html/canvas/element/layers/2d.layer.global-states.filter.alpha.composite.html
@@ -1,6 +1,7 @@
 <!DOCTYPE html>
 <!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
 <link rel="match" href="2d.layer.global-states.filter.alpha.composite-expected.html">
+<meta name=fuzzy content="maxDifference=0-1; totalPixels=0-5204">
 <title>Canvas test: 2d.layer.global-states.filter.alpha.composite</title>
 <h1>2d.layer.global-states.filter.alpha.composite</h1>
 <p class="desc">Checks that layers with filters correctly use global render states.</p>
diff --git a/testing/web-platform/tests/html/canvas/element/layers/2d.layer.global-states.filter.alpha.html b/testing/web-platform/tests/html/canvas/element/layers/2d.layer.global-states.filter.alpha.html
index 5133aa170e..85718cffba 100644
--- a/testing/web-platform/tests/html/canvas/element/layers/2d.layer.global-states.filter.alpha.html
+++ b/testing/web-platform/tests/html/canvas/element/layers/2d.layer.global-states.filter.alpha.html
@@ -1,6 +1,7 @@
 <!DOCTYPE html>
 <!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
 <link rel="match" href="2d.layer.global-states.filter.alpha-expected.html">
+<meta name=fuzzy content="maxDifference=0-2; totalPixels=0-6766">
 <title>Canvas test: 2d.layer.global-states.filter.alpha</title>
 <h1>2d.layer.global-states.filter.alpha</h1>
 <p class="desc">Checks that layers with filters correctly use global render states.</p>
diff --git a/testing/web-platform/tests/html/canvas/element/layers/2d.layer.global-states.filter.alpha.shadow.html b/testing/web-platform/tests/html/canvas/element/layers/2d.layer.global-states.filter.alpha.shadow.html
index 6aa8e75a95..aaeb167ccf 100644
--- a/testing/web-platform/tests/html/canvas/element/layers/2d.layer.global-states.filter.alpha.shadow.html
+++ b/testing/web-platform/tests/html/canvas/element/layers/2d.layer.global-states.filter.alpha.shadow.html
@@ -1,6 +1,7 @@
 <!DOCTYPE html>
 <!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
 <link rel="match" href="2d.layer.global-states.filter.alpha.shadow-expected.html">
+<meta name=fuzzy content="maxDifference=0-2; totalPixels=0-6311">
 <title>Canvas test: 2d.layer.global-states.filter.alpha.shadow</title>
 <h1>2d.layer.global-states.filter.alpha.shadow</h1>
 <p class="desc">Checks that layers with filters correctly use global render states.</p>
diff --git a/testing/web-platform/tests/html/canvas/element/manual/filters/tentative/canvas-filter-object-turbulence-expected.html b/testing/web-platform/tests/html/canvas/element/manual/filters/tentative/canvas-filter-object-turbulence-expected.html
index ff0eebe2e0..ea5600b006 100644
--- a/testing/web-platform/tests/html/canvas/element/manual/filters/tentative/canvas-filter-object-turbulence-expected.html
+++ b/testing/web-platform/tests/html/canvas/element/manual/filters/tentative/canvas-filter-object-turbulence-expected.html
@@ -1,28 +1,28 @@
 <body>
   <svg style="display:none">>
     <filter id="base">
-      <feTurbulence baseFrequency="0.025"/>
+      <feTurbulence baseFrequency="0.03125"/>
     </filter>
     <filter id="base2d">
-      <feTurbulence baseFrequency="0.025, 0.1"/>
+      <feTurbulence baseFrequency="0.03125, 0.125"/>
     </filter>
     <filter id="highFrequency">
-      <feTurbulence baseFrequency="0.05"/>
+      <feTurbulence baseFrequency="0.0625"/>
     </filter>
     <filter id="seed">
-      <feTurbulence baseFrequency="0.025" seed="100"/>
+      <feTurbulence baseFrequency="0.03125" seed="100"/>
     </filter>
     <filter id="numOctaves">
-      <feTurbulence baseFrequency="0.025" numOctaves="2"/>
+      <feTurbulence baseFrequency="0.03125" numOctaves="2"/>
     </filter>
     <filter id="empty">
       <feTurbulence/>
     </filter>
     <filter id="fractalNoise">
-      <feTurbulence baseFrequency="0.025" type="fractalNoise"/>
+      <feTurbulence baseFrequency="0.03125" type="fractalNoise"/>
     </filter>
     <filter id="stitchTiles">
-      <feTurbulence baseFrequency="0.025" stitchTiles="noStitch"/>
+      <feTurbulence baseFrequency="0.03125" stitchTiles="noStitch"/>
     </filter>
 </body>
 <script>
@@ -34,4 +34,4 @@
     ctx.filter = `url(#${tc.id})`;
     ctx.fillRect(0, 0, 1, 1);
   }
-</script>
\ No newline at end of file
+</script>
diff --git a/testing/web-platform/tests/html/canvas/element/manual/filters/tentative/canvas-filter-object-turbulence.html b/testing/web-platform/tests/html/canvas/element/manual/filters/tentative/canvas-filter-object-turbulence.html
index b5b494825e..eb0803e42e 100644
--- a/testing/web-platform/tests/html/canvas/element/manual/filters/tentative/canvas-filter-object-turbulence.html
+++ b/testing/web-platform/tests/html/canvas/element/manual/filters/tentative/canvas-filter-object-turbulence.html
@@ -5,14 +5,14 @@
 </body>
 <script>
   const testCases = [
-    {baseFrequency: 0.025},
-    {baseFrequency: [0.025, 0.1]},
-    {baseFrequency: 0.05},
-    {baseFrequency: 0.025, seed: 100},
-    {baseFrequency: 0.025, numOctaves: 2},
+    {baseFrequency: 0.03125},
+    {baseFrequency: [0.03125, 0.125]},
+    {baseFrequency: 0.0625},
+    {baseFrequency: 0.03125, seed: 100},
+    {baseFrequency: 0.03125, numOctaves: 2},
     {},
-    {baseFrequency: 0.025, type: "fractalNoise"},
-    {baseFrequency: 0.025, stitchTiles: "stitch"},
+    {baseFrequency: 0.03125, type: "fractalNoise"},
+    {baseFrequency: 0.03125, stitchTiles: "stitch"},
   ]
 
   for (tc of testCases) {
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.blur.exceptions.tentative.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.blur.exceptions.tentative.html
index d8f14529c5..e7461eacdb 100644
--- a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.blur.exceptions.tentative.html
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.blur.exceptions.tentative.html
@@ -6,11 +6,11 @@
 <script src="/html/canvas/resources/canvas-tests.js"></script>
 
 <h1>2d.filter.canvasFilterObject.blur.exceptions.tentative</h1>
-<p class="desc">Test exceptions on CanvasFilter() blur.object</p>
+<p class="desc">Test exceptions on gaussianBlur filter</p>
 
 
 <script>
-var t = async_test("Test exceptions on CanvasFilter() blur.object");
+var t = async_test("Test exceptions on gaussianBlur filter");
 var t_pass = t.done.bind(t);
 var t_fail = t.step_func(function(reason) {
     throw reason;
@@ -20,12 +20,18 @@ t.step(function() {
   var canvas = new OffscreenCanvas(100, 50);
   var ctx = canvas.getContext('2d');
 
-  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter({name: 'gaussianBlur'}); });
-  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter({name: 'gaussianBlur', stdDeviation: undefined}); });
-  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter({name: 'gaussianBlur', stdDeviation: 'foo'}); });
-  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter({name: 'gaussianBlur', stdDeviation: [1,2,3]}); });
-  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter({name: 'gaussianBlur', stdDeviation: NaN}); });
-  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter({name: 'gaussianBlur', stdDeviation: {}}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'gaussianBlur'}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'gaussianBlur', stdDeviation: undefined}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'gaussianBlur', stdDeviation: 'foo'}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'gaussianBlur', stdDeviation: [1,2,3]}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'gaussianBlur', stdDeviation: NaN}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'gaussianBlur', stdDeviation: {}}); });
   t.done();
 
 });
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.blur.exceptions.tentative.worker.js b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.blur.exceptions.tentative.worker.js
index 9b3fb3c04c..1c27168968 100644
--- a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.blur.exceptions.tentative.worker.js
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.blur.exceptions.tentative.worker.js
@@ -1,12 +1,12 @@
 // DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
 // OffscreenCanvas test in a worker:2d.filter.canvasFilterObject.blur.exceptions.tentative
-// Description:Test exceptions on CanvasFilter() blur.object
+// Description:Test exceptions on gaussianBlur filter
 // Note:
 
 importScripts("/resources/testharness.js");
 importScripts("/html/canvas/resources/canvas-tests.js");
 
-var t = async_test("Test exceptions on CanvasFilter() blur.object");
+var t = async_test("Test exceptions on gaussianBlur filter");
 var t_pass = t.done.bind(t);
 var t_fail = t.step_func(function(reason) {
     throw reason;
@@ -16,12 +16,18 @@ t.step(function() {
   var canvas = new OffscreenCanvas(100, 50);
   var ctx = canvas.getContext('2d');
 
-  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter({name: 'gaussianBlur'}); });
-  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter({name: 'gaussianBlur', stdDeviation: undefined}); });
-  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter({name: 'gaussianBlur', stdDeviation: 'foo'}); });
-  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter({name: 'gaussianBlur', stdDeviation: [1,2,3]}); });
-  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter({name: 'gaussianBlur', stdDeviation: NaN}); });
-  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter({name: 'gaussianBlur', stdDeviation: {}}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'gaussianBlur'}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'gaussianBlur', stdDeviation: undefined}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'gaussianBlur', stdDeviation: 'foo'}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'gaussianBlur', stdDeviation: [1,2,3]}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'gaussianBlur', stdDeviation: NaN}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'gaussianBlur', stdDeviation: {}}); });
   t.done();
 });
 done();
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.colorMatrix.tentative.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.colorMatrix.tentative.html
index 242094d9f9..0370c1387b 100644
--- a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.colorMatrix.tentative.html
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.colorMatrix.tentative.html
@@ -6,11 +6,11 @@
 <script src="/html/canvas/resources/canvas-tests.js"></script>
 
 <h1>2d.filter.canvasFilterObject.colorMatrix.tentative</h1>
-<p class="desc">Test the functionality of ColorMatrix filters in CanvasFilter objects</p>
+<p class="desc">Test the functionality of ColorMatrix filters</p>
 
 
 <script>
-var t = async_test("Test the functionality of ColorMatrix filters in CanvasFilter objects");
+var t = async_test("Test the functionality of ColorMatrix filters");
 var t_pass = t.done.bind(t);
 var t_fail = t.step_func(function(reason) {
     throw reason;
@@ -20,38 +20,67 @@ t.step(function() {
   var canvas = new OffscreenCanvas(100, 50);
   var ctx = canvas.getContext('2d');
 
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'colorMatrix', values: undefined}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'colorMatrix', values: 'foo'}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'colorMatrix', values: null}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'colorMatrix', values: [1, 2, 3]}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'colorMatrix', values: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 'a']}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'colorMatrix', values: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, Infinity]}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'colorMatrix', values: undefined}); });
+
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'colorMatrix', values: 'foo'}); });
+
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'colorMatrix', values: null}); });
+
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'colorMatrix', values: [1, 2, 3]}); });
+
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'colorMatrix',
+     values: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18,
+              19, 'a']}); });
+
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'colorMatrix',
+     values: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18,
+              19, Infinity]}); });
+
   ctx.fillStyle = '#f00';
-  ctx.filter = new CanvasFilter({name: 'colorMatrix', type: 'hueRotate', values: 0});
+  ctx.filter = new CanvasFilter(
+    {name: 'colorMatrix', type: 'hueRotate', values: 0});
   ctx.fillRect(0, 0, 100, 50);
   _assertPixelApprox(canvas, 10,10, 255,0,0,255, 2);
-  ctx.filter = new CanvasFilter({name: 'colorMatrix', type: 'hueRotate', values: 90});
+
+  ctx.filter = new CanvasFilter(
+    {name: 'colorMatrix', type: 'hueRotate', values: 90});
   ctx.fillRect(0, 0, 100, 50);
   _assertPixelApprox(canvas, 10,10, 0,91,0,255, 2);
-  ctx.filter = new CanvasFilter({name: 'colorMatrix', type: 'hueRotate', values: 180});
+
+  ctx.filter = new CanvasFilter(
+    {name: 'colorMatrix', type: 'hueRotate', values: 180});
   ctx.fillRect(0, 0, 100, 50);
   _assertPixelApprox(canvas, 10,10, 0,109,109,255, 2);
-  ctx.filter = new CanvasFilter({name: 'colorMatrix', type: 'hueRotate', values: 270});
+
+  ctx.filter = new CanvasFilter(
+    {name: 'colorMatrix', type: 'hueRotate', values: 270});
   ctx.fillRect(0, 0, 100, 50);
   _assertPixelApprox(canvas, 10,10, 109,18,255,255, 2);
-  ctx.filter = new CanvasFilter({name: 'colorMatrix', type: 'saturate', values: 0.5});
+
+  ctx.filter = new CanvasFilter(
+    {name: 'colorMatrix', type: 'saturate', values: 0.5});
   ctx.fillRect(0, 0, 100, 50);
   _assertPixelApprox(canvas, 10,10, 155,27,27,255, 2);
+
   ctx.clearRect(0, 0, 100, 50);
-  ctx.filter = new CanvasFilter({name: 'colorMatrix', type: 'luminanceToAlpha'});
+  ctx.filter = new CanvasFilter(
+    {name: 'colorMatrix', type: 'luminanceToAlpha'});
   ctx.fillRect(0, 0, 100, 50);
   _assertPixelApprox(canvas, 10,10, 0,0,0,54, 2);
-  ctx.filter = new CanvasFilter({name: 'colorMatrix', values: [
-          0, 0, 0, 0, 0,
-          1, 1, 1, 1, 0,
-          0, 0, 0, 0, 0,
-          0, 0, 0, 1, 0
-  ]});
+
+  ctx.filter = new CanvasFilter(
+    {name: 'colorMatrix', values: [
+      0, 0, 0, 0, 0,
+      1, 1, 1, 1, 0,
+      0, 0, 0, 0, 0,
+      0, 0, 0, 1, 0
+    ]});
   ctx.fillRect(0, 0, 50, 25);
   ctx.fillStyle = '#0f0';
   ctx.fillRect(50, 0, 50, 25);
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.colorMatrix.tentative.worker.js b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.colorMatrix.tentative.worker.js
index d214e1d836..62e4582efd 100644
--- a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.colorMatrix.tentative.worker.js
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.colorMatrix.tentative.worker.js
@@ -1,12 +1,12 @@
 // DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
 // OffscreenCanvas test in a worker:2d.filter.canvasFilterObject.colorMatrix.tentative
-// Description:Test the functionality of ColorMatrix filters in CanvasFilter objects
+// Description:Test the functionality of ColorMatrix filters
 // Note:
 
 importScripts("/resources/testharness.js");
 importScripts("/html/canvas/resources/canvas-tests.js");
 
-var t = async_test("Test the functionality of ColorMatrix filters in CanvasFilter objects");
+var t = async_test("Test the functionality of ColorMatrix filters");
 var t_pass = t.done.bind(t);
 var t_fail = t.step_func(function(reason) {
     throw reason;
@@ -16,38 +16,67 @@ t.step(function() {
   var canvas = new OffscreenCanvas(100, 50);
   var ctx = canvas.getContext('2d');
 
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'colorMatrix', values: undefined}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'colorMatrix', values: 'foo'}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'colorMatrix', values: null}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'colorMatrix', values: [1, 2, 3]}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'colorMatrix', values: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 'a']}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'colorMatrix', values: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, Infinity]}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'colorMatrix', values: undefined}); });
+
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'colorMatrix', values: 'foo'}); });
+
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'colorMatrix', values: null}); });
+
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'colorMatrix', values: [1, 2, 3]}); });
+
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'colorMatrix',
+     values: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18,
+              19, 'a']}); });
+
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'colorMatrix',
+     values: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18,
+              19, Infinity]}); });
+
   ctx.fillStyle = '#f00';
-  ctx.filter = new CanvasFilter({name: 'colorMatrix', type: 'hueRotate', values: 0});
+  ctx.filter = new CanvasFilter(
+    {name: 'colorMatrix', type: 'hueRotate', values: 0});
   ctx.fillRect(0, 0, 100, 50);
   _assertPixelApprox(canvas, 10,10, 255,0,0,255, 2);
-  ctx.filter = new CanvasFilter({name: 'colorMatrix', type: 'hueRotate', values: 90});
+
+  ctx.filter = new CanvasFilter(
+    {name: 'colorMatrix', type: 'hueRotate', values: 90});
   ctx.fillRect(0, 0, 100, 50);
   _assertPixelApprox(canvas, 10,10, 0,91,0,255, 2);
-  ctx.filter = new CanvasFilter({name: 'colorMatrix', type: 'hueRotate', values: 180});
+
+  ctx.filter = new CanvasFilter(
+    {name: 'colorMatrix', type: 'hueRotate', values: 180});
   ctx.fillRect(0, 0, 100, 50);
   _assertPixelApprox(canvas, 10,10, 0,109,109,255, 2);
-  ctx.filter = new CanvasFilter({name: 'colorMatrix', type: 'hueRotate', values: 270});
+
+  ctx.filter = new CanvasFilter(
+    {name: 'colorMatrix', type: 'hueRotate', values: 270});
   ctx.fillRect(0, 0, 100, 50);
   _assertPixelApprox(canvas, 10,10, 109,18,255,255, 2);
-  ctx.filter = new CanvasFilter({name: 'colorMatrix', type: 'saturate', values: 0.5});
+
+  ctx.filter = new CanvasFilter(
+    {name: 'colorMatrix', type: 'saturate', values: 0.5});
   ctx.fillRect(0, 0, 100, 50);
   _assertPixelApprox(canvas, 10,10, 155,27,27,255, 2);
+
   ctx.clearRect(0, 0, 100, 50);
-  ctx.filter = new CanvasFilter({name: 'colorMatrix', type: 'luminanceToAlpha'});
+  ctx.filter = new CanvasFilter(
+    {name: 'colorMatrix', type: 'luminanceToAlpha'});
   ctx.fillRect(0, 0, 100, 50);
   _assertPixelApprox(canvas, 10,10, 0,0,0,54, 2);
-  ctx.filter = new CanvasFilter({name: 'colorMatrix', values: [
-          0, 0, 0, 0, 0,
-          1, 1, 1, 1, 0,
-          0, 0, 0, 0, 0,
-          0, 0, 0, 1, 0
-  ]});
+
+  ctx.filter = new CanvasFilter(
+    {name: 'colorMatrix', values: [
+      0, 0, 0, 0, 0,
+      1, 1, 1, 1, 0,
+      0, 0, 0, 0, 0,
+      0, 0, 0, 1, 0
+    ]});
   ctx.fillRect(0, 0, 50, 25);
   ctx.fillStyle = '#0f0';
   ctx.fillRect(50, 0, 50, 25);
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.discrete.tentative-expected.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.discrete.tentative-expected.html
new file mode 100644
index 0000000000..2b1c1c1c07
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.discrete.tentative-expected.html
@@ -0,0 +1,50 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>Canvas test: 2d.filter.canvasFilterObject.componentTransfer.discrete.tentative</title>
+<h1>2d.filter.canvasFilterObject.componentTransfer.discrete.tentative</h1>
+<p class="desc">Test pixels on CanvasFilter() componentTransfer with discrete type</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = document.getElementById("canvas");
+  const ctx = canvas.getContext('2d');
+
+  // From https://www.w3.org/TR/SVG11/filters.html#feComponentTransferElement
+  function getTransformedValue(C, V) {
+      // Get the right interval
+      const n = V.length;
+      const k = C == 1 ? n - 1 : Math.floor(C * n);
+      return V[k];
+  }
+
+  function getColor(inputColor, tableValues) {
+      const result = [0, 0, 0];
+      for (const i in inputColor) {
+          const C = inputColor[i]/255;
+          const Cprime = getTransformedValue(C, tableValues[i]);
+          result[i] = Math.max(0, Math.min(1, Cprime)) * 255;
+      }
+      return result;
+  }
+
+  tableValuesR = [0, 0, 1, 1];
+  tableValuesG = [2, 0, 0.5, 3];
+  tableValuesB = [1, -1, 5, 0];
+
+  const inputColors = [
+      [255, 255, 255],
+      [0, 0, 0],
+      [127, 0, 34],
+      [252, 186, 3],
+      [50, 68, 87],
+  ];
+  for (let i = 0 ; i < inputColors.length ; ++i) {
+      const color = inputColors[i];
+      let outputColor = getColor(
+          color, [tableValuesR, tableValuesG, tableValuesB]);
+      ctx.fillStyle = `rgb(${outputColor[0]}, ${outputColor[1]},
+        ${outputColor[2]})`;
+      ctx.fillRect(i * 10, i * 10, 10, 10);
+  }
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.discrete.tentative.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.discrete.tentative.html
index ff1de6bc9c..491d073efb 100644
--- a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.discrete.tentative.html
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.discrete.tentative.html
@@ -1,42 +1,16 @@
 <!DOCTYPE html>
 <!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
-<title>OffscreenCanvas test: 2d.filter.canvasFilterObject.componentTransfer.discrete.tentative</title>
-<script src="/resources/testharness.js"></script>
-<script src="/resources/testharnessreport.js"></script>
-<script src="/html/canvas/resources/canvas-tests.js"></script>
-
+<link rel="match" href="2d.filter.canvasFilterObject.componentTransfer.discrete.tentative-expected.html">
+<meta name=fuzzy content="maxDifference=0-2; totalPixels=0-500">
+<title>Canvas test: 2d.filter.canvasFilterObject.componentTransfer.discrete.tentative</title>
 <h1>2d.filter.canvasFilterObject.componentTransfer.discrete.tentative</h1>
 <p class="desc">Test pixels on CanvasFilter() componentTransfer with discrete type</p>
-
-
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
 <script>
-var t = async_test("Test pixels on CanvasFilter() componentTransfer with discrete type");
-var t_pass = t.done.bind(t);
-var t_fail = t.step_func(function(reason) {
-    throw reason;
-});
-t.step(function() {
-
-  var canvas = new OffscreenCanvas(100, 50);
-  var ctx = canvas.getContext('2d');
-
-  // From https://www.w3.org/TR/SVG11/filters.html#feComponentTransferElement
-  function getTransformedValue(C, V) {
-      // Get the right interval
-      const n = V.length;
-      const k = C == 1 ? n - 1 : Math.floor(C * n);
-      return V[k];
-  }
-
-  function getColor(inputColor, tableValues) {
-      const result = [0, 0, 0];
-      for (const i in inputColor) {
-          const C = inputColor[i]/255;
-          const Cprime = getTransformedValue(C, tableValues[i]);
-          result[i] = Math.max(0, Math.min(1, Cprime)) * 255;
-      }
-      return result;
-  }
+  const canvas = new OffscreenCanvas(100, 100);
+  const ctx = canvas.getContext('2d');
 
   tableValuesR = [0, 0, 1, 1];
   tableValuesG = [2, 0, 0.5, 3];
@@ -55,13 +29,12 @@ t.step(function() {
       [50, 68, 87],
   ];
 
-  for (const color of inputColors) {
-      let outputColor = getColor(color, [tableValuesR, tableValuesG, tableValuesB]);
+  for (let i = 0 ; i < inputColors.length ; ++i) {
+      const color = inputColors[i];
       ctx.fillStyle = `rgb(${color[0]}, ${color[1]}, ${color[2]})`;
-      ctx.fillRect(0, 0, 10, 10);
-      _assertPixelApprox(canvas, 5, 5, outputColor[0],outputColor[1],outputColor[2],255, 2);
+      ctx.fillRect(i * 10, i * 10, 10, 10);
   }
-  t.done();
 
-});
+  const outputCanvas = document.getElementById("canvas");
+  outputCanvas.getContext('2d').drawImage(canvas, 0, 0);
 </script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.discrete.tentative.w.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.discrete.tentative.w.html
new file mode 100644
index 0000000000..d3a999a242
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.discrete.tentative.w.html
@@ -0,0 +1,54 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<html class="reftest-wait">
+<link rel="match" href="2d.filter.canvasFilterObject.componentTransfer.discrete.tentative-expected.html">
+<meta name=fuzzy content="maxDifference=0-2; totalPixels=0-500">
+<title>Canvas test: 2d.filter.canvasFilterObject.componentTransfer.discrete.tentative</title>
+<h1>2d.filter.canvasFilterObject.componentTransfer.discrete.tentative</h1>
+<p class="desc">Test pixels on CanvasFilter() componentTransfer with discrete type</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script id='myWorker' type='text/worker'>
+  self.onmessage = function(e) {
+    const canvas = new OffscreenCanvas(100, 100);
+    const ctx = canvas.getContext('2d');
+
+    tableValuesR = [0, 0, 1, 1];
+    tableValuesG = [2, 0, 0.5, 3];
+    tableValuesB = [1, -1, 5, 0];
+    ctx.filter = new CanvasFilter({name: 'componentTransfer',
+        funcR: {type: 'discrete', tableValues: tableValuesR},
+        funcG: {type: 'discrete', tableValues: tableValuesG},
+        funcB: {type: 'discrete', tableValues: tableValuesB},
+    });
+
+    const inputColors = [
+        [255, 255, 255],
+        [0, 0, 0],
+        [127, 0, 34],
+        [252, 186, 3],
+        [50, 68, 87],
+    ];
+
+    for (let i = 0 ; i < inputColors.length ; ++i) {
+        const color = inputColors[i];
+        ctx.fillStyle = `rgb(${color[0]}, ${color[1]}, ${color[2]})`;
+        ctx.fillRect(i * 10, i * 10, 10, 10);
+    }
+
+    const bitmap = canvas.transferToImageBitmap();
+    self.postMessage(bitmap, bitmap);
+  };
+</script>
+<script>
+  const blob = new Blob([document.getElementById('myWorker').textContent]);
+  const worker = new Worker(URL.createObjectURL(blob));
+  worker.addEventListener('message', msg => {
+    const outputCtx = document.getElementById("canvas").getContext('2d');
+    outputCtx.drawImage(msg.data, 0, 0);
+    document.documentElement.classList.remove("reftest-wait");
+  });
+  worker.postMessage(null);
+</script>
+</html>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.discrete.tentative.worker.js b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.discrete.tentative.worker.js
deleted file mode 100644
index 0e68f4899f..0000000000
--- a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.discrete.tentative.worker.js
+++ /dev/null
@@ -1,62 +0,0 @@
-// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
-// OffscreenCanvas test in a worker:2d.filter.canvasFilterObject.componentTransfer.discrete.tentative
-// Description:Test pixels on CanvasFilter() componentTransfer with discrete type
-// Note:
-
-importScripts("/resources/testharness.js");
-importScripts("/html/canvas/resources/canvas-tests.js");
-
-var t = async_test("Test pixels on CanvasFilter() componentTransfer with discrete type");
-var t_pass = t.done.bind(t);
-var t_fail = t.step_func(function(reason) {
-    throw reason;
-});
-t.step(function() {
-
-  var canvas = new OffscreenCanvas(100, 50);
-  var ctx = canvas.getContext('2d');
-
-  // From https://www.w3.org/TR/SVG11/filters.html#feComponentTransferElement
-  function getTransformedValue(C, V) {
-      // Get the right interval
-      const n = V.length;
-      const k = C == 1 ? n - 1 : Math.floor(C * n);
-      return V[k];
-  }
-
-  function getColor(inputColor, tableValues) {
-      const result = [0, 0, 0];
-      for (const i in inputColor) {
-          const C = inputColor[i]/255;
-          const Cprime = getTransformedValue(C, tableValues[i]);
-          result[i] = Math.max(0, Math.min(1, Cprime)) * 255;
-      }
-      return result;
-  }
-
-  tableValuesR = [0, 0, 1, 1];
-  tableValuesG = [2, 0, 0.5, 3];
-  tableValuesB = [1, -1, 5, 0];
-  ctx.filter = new CanvasFilter({name: 'componentTransfer',
-      funcR: {type: 'discrete', tableValues: tableValuesR},
-      funcG: {type: 'discrete', tableValues: tableValuesG},
-      funcB: {type: 'discrete', tableValues: tableValuesB},
-  });
-
-  const inputColors = [
-      [255, 255, 255],
-      [0, 0, 0],
-      [127, 0, 34],
-      [252, 186, 3],
-      [50, 68, 87],
-  ];
-
-  for (const color of inputColors) {
-      let outputColor = getColor(color, [tableValuesR, tableValuesG, tableValuesB]);
-      ctx.fillStyle = `rgb(${color[0]}, ${color[1]}, ${color[2]})`;
-      ctx.fillRect(0, 0, 10, 10);
-      _assertPixelApprox(canvas, 5, 5, outputColor[0],outputColor[1],outputColor[2],255, 2);
-  }
-  t.done();
-});
-done();
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.gamma.tentative-expected.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.gamma.tentative-expected.html
new file mode 100644
index 0000000000..5adc9f53e2
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.gamma.tentative-expected.html
@@ -0,0 +1,44 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>Canvas test: 2d.filter.canvasFilterObject.componentTransfer.gamma.tentative</title>
+<h1>2d.filter.canvasFilterObject.componentTransfer.gamma.tentative</h1>
+<p class="desc">Test pixels on CanvasFilter() componentTransfer with gamma type</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = document.getElementById("canvas");
+  const ctx = canvas.getContext('2d');
+
+  // From https://www.w3.org/TR/SVG11/filters.html#feComponentTransferElement
+  function getColor(inputColor, amplitude, exponent, offset) {
+      return [
+          Math.max(0, Math.min(1, Math.pow(inputColor[0]/255,
+            exponent[0]) * amplitude[0] + offset[0])) * 255,
+          Math.max(0, Math.min(1, Math.pow(inputColor[1]/255,
+            exponent[1]) * amplitude[1] + offset[1])) * 255,
+          Math.max(0, Math.min(1, Math.pow(inputColor[2]/255,
+            exponent[2]) * amplitude[2] + offset[2])) * 255,
+      ];
+  }
+
+  const amplitudes = [2, 1.1, 0.5];
+  const exponents = [5, 3, 1];
+  const offsets = [0.25, 0, 0.5];
+
+  const inputColors = [
+      [255, 255, 255],
+      [0, 0, 0],
+      [127, 0, 34],
+      [252, 186, 3],
+      [50, 68, 87],
+  ];
+
+  for (let i = 0 ; i < inputColors.length ; ++i) {
+      const color = inputColors[i];
+      let outputColor = getColor(color, amplitudes, exponents, offsets);
+      ctx.fillStyle = `rgb(${outputColor[0]}, ${outputColor[1]},
+        ${outputColor[2]})`;
+      ctx.fillRect(i * 10, i * 10, 10, 10);
+  }
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.gamma.tentative.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.gamma.tentative.html
index 64c30fc417..b262f3b1d3 100644
--- a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.gamma.tentative.html
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.gamma.tentative.html
@@ -1,41 +1,27 @@
 <!DOCTYPE html>
 <!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
-<title>OffscreenCanvas test: 2d.filter.canvasFilterObject.componentTransfer.gamma.tentative</title>
-<script src="/resources/testharness.js"></script>
-<script src="/resources/testharnessreport.js"></script>
-<script src="/html/canvas/resources/canvas-tests.js"></script>
-
+<link rel="match" href="2d.filter.canvasFilterObject.componentTransfer.gamma.tentative-expected.html">
+<meta name=fuzzy content="maxDifference=0-2; totalPixels=0-500">
+<title>Canvas test: 2d.filter.canvasFilterObject.componentTransfer.gamma.tentative</title>
 <h1>2d.filter.canvasFilterObject.componentTransfer.gamma.tentative</h1>
 <p class="desc">Test pixels on CanvasFilter() componentTransfer with gamma type</p>
-
-
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
 <script>
-var t = async_test("Test pixels on CanvasFilter() componentTransfer with gamma type");
-var t_pass = t.done.bind(t);
-var t_fail = t.step_func(function(reason) {
-    throw reason;
-});
-t.step(function() {
-
-  var canvas = new OffscreenCanvas(100, 50);
-  var ctx = canvas.getContext('2d');
-
-  // From https://www.w3.org/TR/SVG11/filters.html#feComponentTransferElement
-  function getColor(inputColor, amplitude, exponent, offset) {
-      return [
-          Math.max(0, Math.min(1, Math.pow(inputColor[0]/255, exponent[0]) * amplitude[0] + offset[0])) * 255,
-          Math.max(0, Math.min(1, Math.pow(inputColor[1]/255, exponent[1]) * amplitude[1] + offset[1])) * 255,
-          Math.max(0, Math.min(1, Math.pow(inputColor[2]/255, exponent[2]) * amplitude[2] + offset[2])) * 255,
-      ];
-  }
+  const canvas = new OffscreenCanvas(100, 100);
+  const ctx = canvas.getContext('2d');
 
   const amplitudes = [2, 1.1, 0.5];
   const exponents = [5, 3, 1];
   const offsets = [0.25, 0, 0.5];
   ctx.filter = new CanvasFilter({name: 'componentTransfer',
-      funcR: {type: 'gamma', amplitude: amplitudes[0], exponent: exponents[0], offset: offsets[0]},
-      funcG: {type: 'gamma', amplitude: amplitudes[1], exponent: exponents[1], offset: offsets[1]},
-      funcB: {type: 'gamma', amplitude: amplitudes[2], exponent: exponents[2], offset: offsets[2]},
+      funcR: {type: 'gamma', amplitude: amplitudes[0],
+        exponent: exponents[0], offset: offsets[0]},
+      funcG: {type: 'gamma', amplitude: amplitudes[1],
+        exponent: exponents[1], offset: offsets[1]},
+      funcB: {type: 'gamma', amplitude: amplitudes[2],
+        exponent: exponents[2], offset: offsets[2]},
   });
 
   const inputColors = [
@@ -46,13 +32,12 @@ t.step(function() {
       [50, 68, 87],
   ];
 
-  for (const color of inputColors) {
-      let outputColor = getColor(color, amplitudes, exponents, offsets);
+  for (let i = 0 ; i < inputColors.length ; ++i) {
+      const color = inputColors[i];
       ctx.fillStyle = `rgb(${color[0]}, ${color[1]}, ${color[2]})`;
-      ctx.fillRect(0, 0, 10, 10);
-      _assertPixelApprox(canvas, 5, 5, outputColor[0],outputColor[1],outputColor[2],255, 2);
+      ctx.fillRect(i * 10, i * 10, 10, 10);
   }
-  t.done();
 
-});
+  const outputCanvas = document.getElementById("canvas");
+  outputCanvas.getContext('2d').drawImage(canvas, 0, 0);
 </script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.gamma.tentative.w.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.gamma.tentative.w.html
new file mode 100644
index 0000000000..1fe346eacf
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.gamma.tentative.w.html
@@ -0,0 +1,57 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<html class="reftest-wait">
+<link rel="match" href="2d.filter.canvasFilterObject.componentTransfer.gamma.tentative-expected.html">
+<meta name=fuzzy content="maxDifference=0-2; totalPixels=0-500">
+<title>Canvas test: 2d.filter.canvasFilterObject.componentTransfer.gamma.tentative</title>
+<h1>2d.filter.canvasFilterObject.componentTransfer.gamma.tentative</h1>
+<p class="desc">Test pixels on CanvasFilter() componentTransfer with gamma type</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script id='myWorker' type='text/worker'>
+  self.onmessage = function(e) {
+    const canvas = new OffscreenCanvas(100, 100);
+    const ctx = canvas.getContext('2d');
+
+    const amplitudes = [2, 1.1, 0.5];
+    const exponents = [5, 3, 1];
+    const offsets = [0.25, 0, 0.5];
+    ctx.filter = new CanvasFilter({name: 'componentTransfer',
+        funcR: {type: 'gamma', amplitude: amplitudes[0],
+          exponent: exponents[0], offset: offsets[0]},
+        funcG: {type: 'gamma', amplitude: amplitudes[1],
+          exponent: exponents[1], offset: offsets[1]},
+        funcB: {type: 'gamma', amplitude: amplitudes[2],
+          exponent: exponents[2], offset: offsets[2]},
+    });
+
+    const inputColors = [
+        [255, 255, 255],
+        [0, 0, 0],
+        [127, 0, 34],
+        [252, 186, 3],
+        [50, 68, 87],
+    ];
+
+    for (let i = 0 ; i < inputColors.length ; ++i) {
+        const color = inputColors[i];
+        ctx.fillStyle = `rgb(${color[0]}, ${color[1]}, ${color[2]})`;
+        ctx.fillRect(i * 10, i * 10, 10, 10);
+    }
+
+    const bitmap = canvas.transferToImageBitmap();
+    self.postMessage(bitmap, bitmap);
+  };
+</script>
+<script>
+  const blob = new Blob([document.getElementById('myWorker').textContent]);
+  const worker = new Worker(URL.createObjectURL(blob));
+  worker.addEventListener('message', msg => {
+    const outputCtx = document.getElementById("canvas").getContext('2d');
+    outputCtx.drawImage(msg.data, 0, 0);
+    document.documentElement.classList.remove("reftest-wait");
+  });
+  worker.postMessage(null);
+</script>
+</html>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.gamma.tentative.worker.js b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.gamma.tentative.worker.js
deleted file mode 100644
index d59bc699df..0000000000
--- a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.gamma.tentative.worker.js
+++ /dev/null
@@ -1,53 +0,0 @@
-// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
-// OffscreenCanvas test in a worker:2d.filter.canvasFilterObject.componentTransfer.gamma.tentative
-// Description:Test pixels on CanvasFilter() componentTransfer with gamma type
-// Note:
-
-importScripts("/resources/testharness.js");
-importScripts("/html/canvas/resources/canvas-tests.js");
-
-var t = async_test("Test pixels on CanvasFilter() componentTransfer with gamma type");
-var t_pass = t.done.bind(t);
-var t_fail = t.step_func(function(reason) {
-    throw reason;
-});
-t.step(function() {
-
-  var canvas = new OffscreenCanvas(100, 50);
-  var ctx = canvas.getContext('2d');
-
-  // From https://www.w3.org/TR/SVG11/filters.html#feComponentTransferElement
-  function getColor(inputColor, amplitude, exponent, offset) {
-      return [
-          Math.max(0, Math.min(1, Math.pow(inputColor[0]/255, exponent[0]) * amplitude[0] + offset[0])) * 255,
-          Math.max(0, Math.min(1, Math.pow(inputColor[1]/255, exponent[1]) * amplitude[1] + offset[1])) * 255,
-          Math.max(0, Math.min(1, Math.pow(inputColor[2]/255, exponent[2]) * amplitude[2] + offset[2])) * 255,
-      ];
-  }
-
-  const amplitudes = [2, 1.1, 0.5];
-  const exponents = [5, 3, 1];
-  const offsets = [0.25, 0, 0.5];
-  ctx.filter = new CanvasFilter({name: 'componentTransfer',
-      funcR: {type: 'gamma', amplitude: amplitudes[0], exponent: exponents[0], offset: offsets[0]},
-      funcG: {type: 'gamma', amplitude: amplitudes[1], exponent: exponents[1], offset: offsets[1]},
-      funcB: {type: 'gamma', amplitude: amplitudes[2], exponent: exponents[2], offset: offsets[2]},
-  });
-
-  const inputColors = [
-      [255, 255, 255],
-      [0, 0, 0],
-      [127, 0, 34],
-      [252, 186, 3],
-      [50, 68, 87],
-  ];
-
-  for (const color of inputColors) {
-      let outputColor = getColor(color, amplitudes, exponents, offsets);
-      ctx.fillStyle = `rgb(${color[0]}, ${color[1]}, ${color[2]})`;
-      ctx.fillRect(0, 0, 10, 10);
-      _assertPixelApprox(canvas, 5, 5, outputColor[0],outputColor[1],outputColor[2],255, 2);
-  }
-  t.done();
-});
-done();
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.identity.tentative-expected.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.identity.tentative-expected.html
new file mode 100644
index 0000000000..895d531206
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.identity.tentative-expected.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>Canvas test: 2d.filter.canvasFilterObject.componentTransfer.identity.tentative</title>
+<h1>2d.filter.canvasFilterObject.componentTransfer.identity.tentative</h1>
+<p class="desc">Test pixels on CanvasFilter() componentTransfer with identity type</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = document.getElementById("canvas");
+  const ctx = canvas.getContext('2d');
+
+  const inputColors = [
+      [255, 255, 255],
+      [0, 0, 0],
+      [127, 0, 34],
+      [252, 186, 3],
+      [50, 68, 87],
+  ];
+
+  for (let i = 0 ; i < inputColors.length ; ++i) {
+      let outputColor = inputColors[i];
+      ctx.fillStyle = `rgb(${outputColor[0]}, ${outputColor[1]},
+        ${outputColor[2]})`;
+      ctx.fillRect(i * 10, i * 10, 10, 10);
+  }
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.identity.tentative.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.identity.tentative.html
index e0d628952e..26b6e4c702 100644
--- a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.identity.tentative.html
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.identity.tentative.html
@@ -1,24 +1,15 @@
 <!DOCTYPE html>
 <!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
-<title>OffscreenCanvas test: 2d.filter.canvasFilterObject.componentTransfer.identity.tentative</title>
-<script src="/resources/testharness.js"></script>
-<script src="/resources/testharnessreport.js"></script>
-<script src="/html/canvas/resources/canvas-tests.js"></script>
-
+<link rel="match" href="2d.filter.canvasFilterObject.componentTransfer.identity.tentative-expected.html">
+<title>Canvas test: 2d.filter.canvasFilterObject.componentTransfer.identity.tentative</title>
 <h1>2d.filter.canvasFilterObject.componentTransfer.identity.tentative</h1>
 <p class="desc">Test pixels on CanvasFilter() componentTransfer with identity type</p>
-
-
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
 <script>
-var t = async_test("Test pixels on CanvasFilter() componentTransfer with identity type");
-var t_pass = t.done.bind(t);
-var t_fail = t.step_func(function(reason) {
-    throw reason;
-});
-t.step(function() {
-
-  var canvas = new OffscreenCanvas(100, 50);
-  var ctx = canvas.getContext('2d');
+  const canvas = new OffscreenCanvas(100, 100);
+  const ctx = canvas.getContext('2d');
 
   ctx.filter = new CanvasFilter({name: 'componentTransfer',
       funcR: {type: 'identity'},
@@ -34,12 +25,12 @@ t.step(function() {
       [50, 68, 87],
   ];
 
-  for (const color of inputColors) {
-      ctx.fillStyle = `rgba(${color[0]}, ${color[1]}, ${color[2]}, 1)`,
-      ctx.fillRect(0, 0, 10, 10);
-      _assertPixel(canvas, 5, 5, color[0],color[1],color[2],255);
+  for (let i = 0 ; i < inputColors.length ; ++i) {
+      const color = inputColors[i];
+      ctx.fillStyle = `rgb(${color[0]}, ${color[1]}, ${color[2]})`;
+      ctx.fillRect(i * 10, i * 10, 10, 10);
   }
-  t.done();
 
-});
+  const outputCanvas = document.getElementById("canvas");
+  outputCanvas.getContext('2d').drawImage(canvas, 0, 0);
 </script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.identity.tentative.w.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.identity.tentative.w.html
new file mode 100644
index 0000000000..d2216d1647
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.identity.tentative.w.html
@@ -0,0 +1,50 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<html class="reftest-wait">
+<link rel="match" href="2d.filter.canvasFilterObject.componentTransfer.identity.tentative-expected.html">
+<title>Canvas test: 2d.filter.canvasFilterObject.componentTransfer.identity.tentative</title>
+<h1>2d.filter.canvasFilterObject.componentTransfer.identity.tentative</h1>
+<p class="desc">Test pixels on CanvasFilter() componentTransfer with identity type</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script id='myWorker' type='text/worker'>
+  self.onmessage = function(e) {
+    const canvas = new OffscreenCanvas(100, 100);
+    const ctx = canvas.getContext('2d');
+
+    ctx.filter = new CanvasFilter({name: 'componentTransfer',
+        funcR: {type: 'identity'},
+        funcG: {type: 'identity'},
+        funcB: {type: 'identity'},
+    });
+
+    const inputColors = [
+        [255, 255, 255],
+        [0, 0, 0],
+        [127, 0, 34],
+        [252, 186, 3],
+        [50, 68, 87],
+    ];
+
+    for (let i = 0 ; i < inputColors.length ; ++i) {
+        const color = inputColors[i];
+        ctx.fillStyle = `rgb(${color[0]}, ${color[1]}, ${color[2]})`;
+        ctx.fillRect(i * 10, i * 10, 10, 10);
+    }
+
+    const bitmap = canvas.transferToImageBitmap();
+    self.postMessage(bitmap, bitmap);
+  };
+</script>
+<script>
+  const blob = new Blob([document.getElementById('myWorker').textContent]);
+  const worker = new Worker(URL.createObjectURL(blob));
+  worker.addEventListener('message', msg => {
+    const outputCtx = document.getElementById("canvas").getContext('2d');
+    outputCtx.drawImage(msg.data, 0, 0);
+    document.documentElement.classList.remove("reftest-wait");
+  });
+  worker.postMessage(null);
+</script>
+</html>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.identity.tentative.worker.js b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.identity.tentative.worker.js
deleted file mode 100644
index 1b714b58ff..0000000000
--- a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.identity.tentative.worker.js
+++ /dev/null
@@ -1,40 +0,0 @@
-// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
-// OffscreenCanvas test in a worker:2d.filter.canvasFilterObject.componentTransfer.identity.tentative
-// Description:Test pixels on CanvasFilter() componentTransfer with identity type
-// Note:
-
-importScripts("/resources/testharness.js");
-importScripts("/html/canvas/resources/canvas-tests.js");
-
-var t = async_test("Test pixels on CanvasFilter() componentTransfer with identity type");
-var t_pass = t.done.bind(t);
-var t_fail = t.step_func(function(reason) {
-    throw reason;
-});
-t.step(function() {
-
-  var canvas = new OffscreenCanvas(100, 50);
-  var ctx = canvas.getContext('2d');
-
-  ctx.filter = new CanvasFilter({name: 'componentTransfer',
-      funcR: {type: 'identity'},
-      funcG: {type: 'identity'},
-      funcB: {type: 'identity'},
-  });
-
-  const inputColors = [
-      [255, 255, 255],
-      [0, 0, 0],
-      [127, 0, 34],
-      [252, 186, 3],
-      [50, 68, 87],
-  ];
-
-  for (const color of inputColors) {
-      ctx.fillStyle = `rgba(${color[0]}, ${color[1]}, ${color[2]}, 1)`,
-      ctx.fillRect(0, 0, 10, 10);
-      _assertPixel(canvas, 5, 5, color[0],color[1],color[2],255);
-  }
-  t.done();
-});
-done();
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.linear.tentative-expected.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.linear.tentative-expected.html
new file mode 100644
index 0000000000..c4ad790d56
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.linear.tentative-expected.html
@@ -0,0 +1,43 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>Canvas test: 2d.filter.canvasFilterObject.componentTransfer.linear.tentative</title>
+<h1>2d.filter.canvasFilterObject.componentTransfer.linear.tentative</h1>
+<p class="desc">Test pixels on CanvasFilter() componentTransfer with linear type</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = document.getElementById("canvas");
+  const ctx = canvas.getContext('2d');
+
+  // From https://www.w3.org/TR/SVG11/filters.html#feComponentTransferElement
+  function getColor(inputColor, slopes, intercepts) {
+      return [
+          Math.max(0, Math.min(1,
+            inputColor[0]/255 * slopes[0] + intercepts[0])) * 255,
+          Math.max(0, Math.min(1,
+            inputColor[1]/255 * slopes[1] + intercepts[1])) * 255,
+          Math.max(0, Math.min(1,
+            inputColor[2]/255 * slopes[2] + intercepts[2])) * 255,
+      ];
+  }
+
+  const slopes = [0.5, 1.2, -0.2];
+  const intercepts = [0.25, 0, 0.5];
+
+  const inputColors = [
+      [255, 255, 255],
+      [0, 0, 0],
+      [127, 0, 34],
+      [252, 186, 3],
+      [50, 68, 87],
+  ];
+
+  for (let i = 0 ; i < inputColors.length ; ++i) {
+      const color = inputColors[i];
+      let outputColor = getColor(color, slopes, intercepts);
+      ctx.fillStyle = `rgb(${outputColor[0]}, ${outputColor[1]},
+        ${outputColor[2]})`;
+      ctx.fillRect(i * 10, i * 10, 10, 10);
+  }
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.linear.tentative.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.linear.tentative.html
index adbe557fd9..3fc3bd9eec 100644
--- a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.linear.tentative.html
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.linear.tentative.html
@@ -1,33 +1,16 @@
 <!DOCTYPE html>
 <!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
-<title>OffscreenCanvas test: 2d.filter.canvasFilterObject.componentTransfer.linear.tentative</title>
-<script src="/resources/testharness.js"></script>
-<script src="/resources/testharnessreport.js"></script>
-<script src="/html/canvas/resources/canvas-tests.js"></script>
-
+<link rel="match" href="2d.filter.canvasFilterObject.componentTransfer.linear.tentative-expected.html">
+<meta name=fuzzy content="maxDifference=0-2; totalPixels=0-500">
+<title>Canvas test: 2d.filter.canvasFilterObject.componentTransfer.linear.tentative</title>
 <h1>2d.filter.canvasFilterObject.componentTransfer.linear.tentative</h1>
 <p class="desc">Test pixels on CanvasFilter() componentTransfer with linear type</p>
-
-
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
 <script>
-var t = async_test("Test pixels on CanvasFilter() componentTransfer with linear type");
-var t_pass = t.done.bind(t);
-var t_fail = t.step_func(function(reason) {
-    throw reason;
-});
-t.step(function() {
-
-  var canvas = new OffscreenCanvas(100, 50);
-  var ctx = canvas.getContext('2d');
-
-  // From https://www.w3.org/TR/SVG11/filters.html#feComponentTransferElement
-  function getColor(inputColor, slopes, intercepts) {
-      return [
-          Math.max(0, Math.min(1, inputColor[0]/255 * slopes[0] + intercepts[0])) * 255,
-          Math.max(0, Math.min(1, inputColor[1]/255 * slopes[1] + intercepts[1])) * 255,
-          Math.max(0, Math.min(1, inputColor[2]/255 * slopes[2] + intercepts[2])) * 255,
-      ];
-  }
+  const canvas = new OffscreenCanvas(100, 100);
+  const ctx = canvas.getContext('2d');
 
   const slopes = [0.5, 1.2, -0.2];
   const intercepts = [0.25, 0, 0.5];
@@ -45,13 +28,12 @@ t.step(function() {
       [50, 68, 87],
   ];
 
-  for (const color of inputColors) {
-      let outputColor = getColor(color, slopes, intercepts);
+  for (let i = 0 ; i < inputColors.length ; ++i) {
+      const color = inputColors[i];
       ctx.fillStyle = `rgb(${color[0]}, ${color[1]}, ${color[2]})`;
-      ctx.fillRect(0, 0, 10, 10);
-      _assertPixelApprox(canvas, 5, 5, outputColor[0],outputColor[1],outputColor[2],255, 2);
+      ctx.fillRect(i * 10, i * 10, 10, 10);
   }
-  t.done();
 
-});
+  const outputCanvas = document.getElementById("canvas");
+  outputCanvas.getContext('2d').drawImage(canvas, 0, 0);
 </script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.linear.tentative.w.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.linear.tentative.w.html
new file mode 100644
index 0000000000..054dbce929
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.linear.tentative.w.html
@@ -0,0 +1,53 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<html class="reftest-wait">
+<link rel="match" href="2d.filter.canvasFilterObject.componentTransfer.linear.tentative-expected.html">
+<meta name=fuzzy content="maxDifference=0-2; totalPixels=0-500">
+<title>Canvas test: 2d.filter.canvasFilterObject.componentTransfer.linear.tentative</title>
+<h1>2d.filter.canvasFilterObject.componentTransfer.linear.tentative</h1>
+<p class="desc">Test pixels on CanvasFilter() componentTransfer with linear type</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script id='myWorker' type='text/worker'>
+  self.onmessage = function(e) {
+    const canvas = new OffscreenCanvas(100, 100);
+    const ctx = canvas.getContext('2d');
+
+    const slopes = [0.5, 1.2, -0.2];
+    const intercepts = [0.25, 0, 0.5];
+    ctx.filter = new CanvasFilter({name: 'componentTransfer',
+        funcR: {type: 'linear', slope: slopes[0], intercept: intercepts[0]},
+        funcG: {type: 'linear', slope: slopes[1], intercept: intercepts[1]},
+        funcB: {type: 'linear', slope: slopes[2], intercept: intercepts[2]},
+    });
+
+    const inputColors = [
+        [255, 255, 255],
+        [0, 0, 0],
+        [127, 0, 34],
+        [252, 186, 3],
+        [50, 68, 87],
+    ];
+
+    for (let i = 0 ; i < inputColors.length ; ++i) {
+        const color = inputColors[i];
+        ctx.fillStyle = `rgb(${color[0]}, ${color[1]}, ${color[2]})`;
+        ctx.fillRect(i * 10, i * 10, 10, 10);
+    }
+
+    const bitmap = canvas.transferToImageBitmap();
+    self.postMessage(bitmap, bitmap);
+  };
+</script>
+<script>
+  const blob = new Blob([document.getElementById('myWorker').textContent]);
+  const worker = new Worker(URL.createObjectURL(blob));
+  worker.addEventListener('message', msg => {
+    const outputCtx = document.getElementById("canvas").getContext('2d');
+    outputCtx.drawImage(msg.data, 0, 0);
+    document.documentElement.classList.remove("reftest-wait");
+  });
+  worker.postMessage(null);
+</script>
+</html>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.linear.tentative.worker.js b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.linear.tentative.worker.js
deleted file mode 100644
index fb2e01876f..0000000000
--- a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.linear.tentative.worker.js
+++ /dev/null
@@ -1,52 +0,0 @@
-// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
-// OffscreenCanvas test in a worker:2d.filter.canvasFilterObject.componentTransfer.linear.tentative
-// Description:Test pixels on CanvasFilter() componentTransfer with linear type
-// Note:
-
-importScripts("/resources/testharness.js");
-importScripts("/html/canvas/resources/canvas-tests.js");
-
-var t = async_test("Test pixels on CanvasFilter() componentTransfer with linear type");
-var t_pass = t.done.bind(t);
-var t_fail = t.step_func(function(reason) {
-    throw reason;
-});
-t.step(function() {
-
-  var canvas = new OffscreenCanvas(100, 50);
-  var ctx = canvas.getContext('2d');
-
-  // From https://www.w3.org/TR/SVG11/filters.html#feComponentTransferElement
-  function getColor(inputColor, slopes, intercepts) {
-      return [
-          Math.max(0, Math.min(1, inputColor[0]/255 * slopes[0] + intercepts[0])) * 255,
-          Math.max(0, Math.min(1, inputColor[1]/255 * slopes[1] + intercepts[1])) * 255,
-          Math.max(0, Math.min(1, inputColor[2]/255 * slopes[2] + intercepts[2])) * 255,
-      ];
-  }
-
-  const slopes = [0.5, 1.2, -0.2];
-  const intercepts = [0.25, 0, 0.5];
-  ctx.filter = new CanvasFilter({name: 'componentTransfer',
-      funcR: {type: 'linear', slope: slopes[0], intercept: intercepts[0]},
-      funcG: {type: 'linear', slope: slopes[1], intercept: intercepts[1]},
-      funcB: {type: 'linear', slope: slopes[2], intercept: intercepts[2]},
-  });
-
-  const inputColors = [
-      [255, 255, 255],
-      [0, 0, 0],
-      [127, 0, 34],
-      [252, 186, 3],
-      [50, 68, 87],
-  ];
-
-  for (const color of inputColors) {
-      let outputColor = getColor(color, slopes, intercepts);
-      ctx.fillStyle = `rgb(${color[0]}, ${color[1]}, ${color[2]})`;
-      ctx.fillRect(0, 0, 10, 10);
-      _assertPixelApprox(canvas, 5, 5, outputColor[0],outputColor[1],outputColor[2],255, 2);
-  }
-  t.done();
-});
-done();
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.table.tentative-expected.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.table.tentative-expected.html
new file mode 100644
index 0000000000..29e250614c
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.table.tentative-expected.html
@@ -0,0 +1,51 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>Canvas test: 2d.filter.canvasFilterObject.componentTransfer.table.tentative</title>
+<h1>2d.filter.canvasFilterObject.componentTransfer.table.tentative</h1>
+<p class="desc">Test pixels on CanvasFilter() componentTransfer with table type</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = document.getElementById("canvas");
+  const ctx = canvas.getContext('2d');
+
+  // From https://www.w3.org/TR/SVG11/filters.html#feComponentTransferElement
+  function getTransformedValue(C, V) {
+      // Get the right interval
+      const n = V.length - 1;
+      const k = C == 1 ? n - 1 : Math.floor(C * n);
+      return V[k] + (C - k/n) * n * (V[k + 1] - V[k]);
+  }
+
+  function getColor(inputColor, tableValues) {
+      const result = [0, 0, 0];
+      for (const i in inputColor) {
+          const C = inputColor[i]/255;
+          const Cprime = getTransformedValue(C, tableValues[i]);
+          result[i] = Math.max(0, Math.min(1, Cprime)) * 255;
+      }
+      return result;
+  }
+
+  tableValuesR = [0, 0, 1, 1];
+  tableValuesG = [2, 0, 0.5, 3];
+  tableValuesB = [1, -1, 5, 0];
+
+  const inputColors = [
+      [255, 255, 255],
+      [0, 0, 0],
+      [127, 0, 34],
+      [252, 186, 3],
+      [50, 68, 87],
+  ];
+
+  for (let i = 0 ; i < inputColors.length ; ++i) {
+      const color = inputColors[i];
+      let outputColor = getColor(
+          color, [tableValuesR, tableValuesG, tableValuesB]);
+      ctx.fillStyle = `rgb(${outputColor[0]}, ${outputColor[1]},
+        ${outputColor[2]})`;
+      ctx.fillRect(i * 10, i * 10, 10, 10);
+  }
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.table.tentative.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.table.tentative.html
index 47048b68a1..ef2da126eb 100644
--- a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.table.tentative.html
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.table.tentative.html
@@ -1,42 +1,16 @@
 <!DOCTYPE html>
 <!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
-<title>OffscreenCanvas test: 2d.filter.canvasFilterObject.componentTransfer.table.tentative</title>
-<script src="/resources/testharness.js"></script>
-<script src="/resources/testharnessreport.js"></script>
-<script src="/html/canvas/resources/canvas-tests.js"></script>
-
+<link rel="match" href="2d.filter.canvasFilterObject.componentTransfer.table.tentative-expected.html">
+<meta name=fuzzy content="maxDifference=0-2; totalPixels=0-500">
+<title>Canvas test: 2d.filter.canvasFilterObject.componentTransfer.table.tentative</title>
 <h1>2d.filter.canvasFilterObject.componentTransfer.table.tentative</h1>
 <p class="desc">Test pixels on CanvasFilter() componentTransfer with table type</p>
-
-
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
 <script>
-var t = async_test("Test pixels on CanvasFilter() componentTransfer with table type");
-var t_pass = t.done.bind(t);
-var t_fail = t.step_func(function(reason) {
-    throw reason;
-});
-t.step(function() {
-
-  var canvas = new OffscreenCanvas(100, 50);
-  var ctx = canvas.getContext('2d');
-
-  // From https://www.w3.org/TR/SVG11/filters.html#feComponentTransferElement
-  function getTransformedValue(C, V) {
-      // Get the right interval
-      const n = V.length - 1;
-      const k = C == 1 ? n - 1 : Math.floor(C * n);
-      return V[k] + (C - k/n) * n * (V[k + 1] - V[k]);
-  }
-
-  function getColor(inputColor, tableValues) {
-      const result = [0, 0, 0];
-      for (const i in inputColor) {
-          const C = inputColor[i]/255;
-          const Cprime = getTransformedValue(C, tableValues[i]);
-          result[i] = Math.max(0, Math.min(1, Cprime)) * 255;
-      }
-      return result;
-  }
+  const canvas = new OffscreenCanvas(100, 100);
+  const ctx = canvas.getContext('2d');
 
   tableValuesR = [0, 0, 1, 1];
   tableValuesG = [2, 0, 0.5, 3];
@@ -55,13 +29,12 @@ t.step(function() {
       [50, 68, 87],
   ];
 
-  for (const color of inputColors) {
-      let outputColor = getColor(color, [tableValuesR, tableValuesG, tableValuesB]);
+  for (let i = 0 ; i < inputColors.length ; ++i) {
+      const color = inputColors[i];
       ctx.fillStyle = `rgb(${color[0]}, ${color[1]}, ${color[2]})`;
-      ctx.fillRect(0, 0, 10, 10);
-      _assertPixelApprox(canvas, 5, 5, outputColor[0],outputColor[1],outputColor[2],255, 2);
+      ctx.fillRect(i * 10, i * 10, 10, 10);
   }
-  t.done();
 
-});
+  const outputCanvas = document.getElementById("canvas");
+  outputCanvas.getContext('2d').drawImage(canvas, 0, 0);
 </script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.table.tentative.w.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.table.tentative.w.html
new file mode 100644
index 0000000000..f39723da8e
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.table.tentative.w.html
@@ -0,0 +1,54 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<html class="reftest-wait">
+<link rel="match" href="2d.filter.canvasFilterObject.componentTransfer.table.tentative-expected.html">
+<meta name=fuzzy content="maxDifference=0-2; totalPixels=0-500">
+<title>Canvas test: 2d.filter.canvasFilterObject.componentTransfer.table.tentative</title>
+<h1>2d.filter.canvasFilterObject.componentTransfer.table.tentative</h1>
+<p class="desc">Test pixels on CanvasFilter() componentTransfer with table type</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script id='myWorker' type='text/worker'>
+  self.onmessage = function(e) {
+    const canvas = new OffscreenCanvas(100, 100);
+    const ctx = canvas.getContext('2d');
+
+    tableValuesR = [0, 0, 1, 1];
+    tableValuesG = [2, 0, 0.5, 3];
+    tableValuesB = [1, -1, 5, 0];
+    ctx.filter = new CanvasFilter({name: 'componentTransfer',
+        funcR: {type: 'table', tableValues: tableValuesR},
+        funcG: {type: 'table', tableValues: tableValuesG},
+        funcB: {type: 'table', tableValues: tableValuesB},
+    });
+
+    const inputColors = [
+        [255, 255, 255],
+        [0, 0, 0],
+        [127, 0, 34],
+        [252, 186, 3],
+        [50, 68, 87],
+    ];
+
+    for (let i = 0 ; i < inputColors.length ; ++i) {
+        const color = inputColors[i];
+        ctx.fillStyle = `rgb(${color[0]}, ${color[1]}, ${color[2]})`;
+        ctx.fillRect(i * 10, i * 10, 10, 10);
+    }
+
+    const bitmap = canvas.transferToImageBitmap();
+    self.postMessage(bitmap, bitmap);
+  };
+</script>
+<script>
+  const blob = new Blob([document.getElementById('myWorker').textContent]);
+  const worker = new Worker(URL.createObjectURL(blob));
+  worker.addEventListener('message', msg => {
+    const outputCtx = document.getElementById("canvas").getContext('2d');
+    outputCtx.drawImage(msg.data, 0, 0);
+    document.documentElement.classList.remove("reftest-wait");
+  });
+  worker.postMessage(null);
+</script>
+</html>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.table.tentative.worker.js b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.table.tentative.worker.js
deleted file mode 100644
index 0799e73a58..0000000000
--- a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.componentTransfer.table.tentative.worker.js
+++ /dev/null
@@ -1,62 +0,0 @@
-// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
-// OffscreenCanvas test in a worker:2d.filter.canvasFilterObject.componentTransfer.table.tentative
-// Description:Test pixels on CanvasFilter() componentTransfer with table type
-// Note:
-
-importScripts("/resources/testharness.js");
-importScripts("/html/canvas/resources/canvas-tests.js");
-
-var t = async_test("Test pixels on CanvasFilter() componentTransfer with table type");
-var t_pass = t.done.bind(t);
-var t_fail = t.step_func(function(reason) {
-    throw reason;
-});
-t.step(function() {
-
-  var canvas = new OffscreenCanvas(100, 50);
-  var ctx = canvas.getContext('2d');
-
-  // From https://www.w3.org/TR/SVG11/filters.html#feComponentTransferElement
-  function getTransformedValue(C, V) {
-      // Get the right interval
-      const n = V.length - 1;
-      const k = C == 1 ? n - 1 : Math.floor(C * n);
-      return V[k] + (C - k/n) * n * (V[k + 1] - V[k]);
-  }
-
-  function getColor(inputColor, tableValues) {
-      const result = [0, 0, 0];
-      for (const i in inputColor) {
-          const C = inputColor[i]/255;
-          const Cprime = getTransformedValue(C, tableValues[i]);
-          result[i] = Math.max(0, Math.min(1, Cprime)) * 255;
-      }
-      return result;
-  }
-
-  tableValuesR = [0, 0, 1, 1];
-  tableValuesG = [2, 0, 0.5, 3];
-  tableValuesB = [1, -1, 5, 0];
-  ctx.filter = new CanvasFilter({name: 'componentTransfer',
-      funcR: {type: 'table', tableValues: tableValuesR},
-      funcG: {type: 'table', tableValues: tableValuesG},
-      funcB: {type: 'table', tableValues: tableValuesB},
-  });
-
-  const inputColors = [
-      [255, 255, 255],
-      [0, 0, 0],
-      [127, 0, 34],
-      [252, 186, 3],
-      [50, 68, 87],
-  ];
-
-  for (const color of inputColors) {
-      let outputColor = getColor(color, [tableValuesR, tableValuesG, tableValuesB]);
-      ctx.fillStyle = `rgb(${color[0]}, ${color[1]}, ${color[2]})`;
-      ctx.fillRect(0, 0, 10, 10);
-      _assertPixelApprox(canvas, 5, 5, outputColor[0],outputColor[1],outputColor[2],255, 2);
-  }
-  t.done();
-});
-done();
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.convolveMatrix.exceptions.tentative.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.convolveMatrix.exceptions.tentative.html
index 301d11f888..08f8860e99 100644
--- a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.convolveMatrix.exceptions.tentative.html
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.convolveMatrix.exceptions.tentative.html
@@ -20,23 +20,39 @@ t.step(function() {
   var canvas = new OffscreenCanvas(100, 50);
   var ctx = canvas.getContext('2d');
 
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'convolveMatrix'}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'convolveMatrix', divisor: 2}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'convolveMatrix', kernelMatrix: null}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'convolveMatrix', kernelMatrix: 1}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'convolveMatrix', kernelMatrix: [[1, 0], [0]]}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'convolveMatrix', kernelMatrix: [[1, 'a'], [0]]}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'convolveMatrix', kernelMatrix: [[1, 0], 0]}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'convolveMatrix', kernelMatrix: [[1, 0], [0, Infinity]]}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'convolveMatrix', kernelMatrix: []}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'convolveMatrix', kernelMatrix: [1]}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'convolveMatrix', kernelMatrix: [1, 2, 3, 4]}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'convolveMatrix', kernelMatrix: [[], []]}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'convolveMatrix', kernelMatrix: [[1, 2], []]}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'convolveMatrix', kernelMatrix: [[], [1, 2]]}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'convolveMatrix'}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'convolveMatrix', divisor: 2}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'convolveMatrix', kernelMatrix: null}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'convolveMatrix', kernelMatrix: 1}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'convolveMatrix', kernelMatrix: [[1, 0], [0]]}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'convolveMatrix', kernelMatrix: [[1, 'a'], [0]]}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'convolveMatrix', kernelMatrix: [[1, 0], 0]}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'convolveMatrix', kernelMatrix: [[1, 0], [0, Infinity]]}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'convolveMatrix', kernelMatrix: []}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'convolveMatrix', kernelMatrix: [1]}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'convolveMatrix', kernelMatrix: [1, 2, 3, 4]}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'convolveMatrix', kernelMatrix: [[], []]}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'convolveMatrix', kernelMatrix: [[1, 2], []]}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'convolveMatrix', kernelMatrix: [[], [1, 2]]}); });
   // This should not throw an error
-  ctx.filter = new CanvasFilter({name: 'convolveMatrix', kernelMatrix: [[]]});
-  ctx.filter = new CanvasFilter({name: 'convolveMatrix', kernelMatrix: [[1]]});
+  ctx.filter = new CanvasFilter(
+    {name: 'convolveMatrix', kernelMatrix: [[]]});
+  ctx.filter = new CanvasFilter(
+    {name: 'convolveMatrix', kernelMatrix: [[1]]});
   t.done();
 
 });
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.convolveMatrix.exceptions.tentative.worker.js b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.convolveMatrix.exceptions.tentative.worker.js
index b4ce4d76b2..105ed67a75 100644
--- a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.convolveMatrix.exceptions.tentative.worker.js
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.convolveMatrix.exceptions.tentative.worker.js
@@ -16,23 +16,39 @@ t.step(function() {
   var canvas = new OffscreenCanvas(100, 50);
   var ctx = canvas.getContext('2d');
 
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'convolveMatrix'}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'convolveMatrix', divisor: 2}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'convolveMatrix', kernelMatrix: null}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'convolveMatrix', kernelMatrix: 1}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'convolveMatrix', kernelMatrix: [[1, 0], [0]]}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'convolveMatrix', kernelMatrix: [[1, 'a'], [0]]}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'convolveMatrix', kernelMatrix: [[1, 0], 0]}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'convolveMatrix', kernelMatrix: [[1, 0], [0, Infinity]]}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'convolveMatrix', kernelMatrix: []}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'convolveMatrix', kernelMatrix: [1]}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'convolveMatrix', kernelMatrix: [1, 2, 3, 4]}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'convolveMatrix', kernelMatrix: [[], []]}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'convolveMatrix', kernelMatrix: [[1, 2], []]}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'convolveMatrix', kernelMatrix: [[], [1, 2]]}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'convolveMatrix'}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'convolveMatrix', divisor: 2}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'convolveMatrix', kernelMatrix: null}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'convolveMatrix', kernelMatrix: 1}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'convolveMatrix', kernelMatrix: [[1, 0], [0]]}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'convolveMatrix', kernelMatrix: [[1, 'a'], [0]]}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'convolveMatrix', kernelMatrix: [[1, 0], 0]}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'convolveMatrix', kernelMatrix: [[1, 0], [0, Infinity]]}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'convolveMatrix', kernelMatrix: []}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'convolveMatrix', kernelMatrix: [1]}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'convolveMatrix', kernelMatrix: [1, 2, 3, 4]}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'convolveMatrix', kernelMatrix: [[], []]}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'convolveMatrix', kernelMatrix: [[1, 2], []]}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'convolveMatrix', kernelMatrix: [[], [1, 2]]}); });
   // This should not throw an error
-  ctx.filter = new CanvasFilter({name: 'convolveMatrix', kernelMatrix: [[]]});
-  ctx.filter = new CanvasFilter({name: 'convolveMatrix', kernelMatrix: [[1]]});
+  ctx.filter = new CanvasFilter(
+    {name: 'convolveMatrix', kernelMatrix: [[]]});
+  ctx.filter = new CanvasFilter(
+    {name: 'convolveMatrix', kernelMatrix: [[1]]});
   t.done();
 });
 done();
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.dropShadow.exceptions.tentative.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.dropShadow.exceptions.tentative.html
index 3e55e97e54..cdd501ba8e 100644
--- a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.dropShadow.exceptions.tentative.html
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.dropShadow.exceptions.tentative.html
@@ -20,104 +20,250 @@ t.step(function() {
   var canvas = new OffscreenCanvas(100, 50);
   var ctx = canvas.getContext('2d');
 
+  // Should not throw an error.
   // dx
-  _assert(new CanvasFilter({name: 'dropShadow', dx: 10}), "new CanvasFilter({name: 'dropShadow', dx: 10})");
-  _assert(new CanvasFilter({name: 'dropShadow', dx: -1}), "new CanvasFilter({name: 'dropShadow', dx: -1})");
-  _assert(new CanvasFilter({name: 'dropShadow', dx: 0.5}), "new CanvasFilter({name: 'dropShadow', dx: 0.5})");
-  _assert(new CanvasFilter({name: 'dropShadow', dx: null}), "new CanvasFilter({name: 'dropShadow', dx: null})");
-  _assert(new CanvasFilter({name: 'dropShadow', dx: true}), "new CanvasFilter({name: 'dropShadow', dx: true})");
-  _assert(new CanvasFilter({name: 'dropShadow', dx: false}), "new CanvasFilter({name: 'dropShadow', dx: false})");
-  _assert(new CanvasFilter({name: 'dropShadow', dx: []}), "new CanvasFilter({name: 'dropShadow', dx: []})");
-  _assert(new CanvasFilter({name: 'dropShadow', dx: [20]}), "new CanvasFilter({name: 'dropShadow', dx: [\""+(20)+"\"]})");
-  _assert(new CanvasFilter({name: 'dropShadow', dx: '30'}), "new CanvasFilter({name: 'dropShadow', dx: '30'})");
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: 10});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: -1});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: 0.5});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: null});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: true});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: false});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: []});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: [20]});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: '30'});
   // dy
-  _assert(new CanvasFilter({name: 'dropShadow', dy: 10}), "new CanvasFilter({name: 'dropShadow', dy: 10})");
-  _assert(new CanvasFilter({name: 'dropShadow', dy: -1}), "new CanvasFilter({name: 'dropShadow', dy: -1})");
-  _assert(new CanvasFilter({name: 'dropShadow', dy: 0.5}), "new CanvasFilter({name: 'dropShadow', dy: 0.5})");
-  _assert(new CanvasFilter({name: 'dropShadow', dy: null}), "new CanvasFilter({name: 'dropShadow', dy: null})");
-  _assert(new CanvasFilter({name: 'dropShadow', dy: true}), "new CanvasFilter({name: 'dropShadow', dy: true})");
-  _assert(new CanvasFilter({name: 'dropShadow', dy: false}), "new CanvasFilter({name: 'dropShadow', dy: false})");
-  _assert(new CanvasFilter({name: 'dropShadow', dy: []}), "new CanvasFilter({name: 'dropShadow', dy: []})");
-  _assert(new CanvasFilter({name: 'dropShadow', dy: [20]}), "new CanvasFilter({name: 'dropShadow', dy: [\""+(20)+"\"]})");
-  _assert(new CanvasFilter({name: 'dropShadow', dy: '30'}), "new CanvasFilter({name: 'dropShadow', dy: '30'})");
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: 10});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: -1});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: 0.5});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: null});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: true});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: false});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: []});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: [20]});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: '30'});
   // floodOpacity
-  _assert(new CanvasFilter({name: 'dropShadow', floodOpacity: 10}), "new CanvasFilter({name: 'dropShadow', floodOpacity: 10})");
-  _assert(new CanvasFilter({name: 'dropShadow', floodOpacity: -1}), "new CanvasFilter({name: 'dropShadow', floodOpacity: -1})");
-  _assert(new CanvasFilter({name: 'dropShadow', floodOpacity: 0.5}), "new CanvasFilter({name: 'dropShadow', floodOpacity: 0.5})");
-  _assert(new CanvasFilter({name: 'dropShadow', floodOpacity: null}), "new CanvasFilter({name: 'dropShadow', floodOpacity: null})");
-  _assert(new CanvasFilter({name: 'dropShadow', floodOpacity: true}), "new CanvasFilter({name: 'dropShadow', floodOpacity: true})");
-  _assert(new CanvasFilter({name: 'dropShadow', floodOpacity: false}), "new CanvasFilter({name: 'dropShadow', floodOpacity: false})");
-  _assert(new CanvasFilter({name: 'dropShadow', floodOpacity: []}), "new CanvasFilter({name: 'dropShadow', floodOpacity: []})");
-  _assert(new CanvasFilter({name: 'dropShadow', floodOpacity: [20]}), "new CanvasFilter({name: 'dropShadow', floodOpacity: [\""+(20)+"\"]})");
-  _assert(new CanvasFilter({name: 'dropShadow', floodOpacity: '30'}), "new CanvasFilter({name: 'dropShadow', floodOpacity: '30'})");
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: 10});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: -1});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: 0.5});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: null});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: true});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: false});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: []});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: [20]});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: '30'});
+  // dx
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: 10});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: -1});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: 0.5});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: null});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: true});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: false});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: []});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: [20]});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: '30'});
+  // dy
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: 10});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: -1});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: 0.5});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: null});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: true});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: false});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: []});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: [20]});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: '30'});
+  // floodOpacity
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: 10});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: -1});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: 0.5});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: null});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: true});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: false});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: []});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: [20]});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: '30'});
   // stdDeviation
-  _assert(new CanvasFilter({name: 'dropShadow', stdDeviation: 10}), "new CanvasFilter({name: 'dropShadow', stdDeviation: 10})");
-  _assert(new CanvasFilter({name: 'dropShadow', stdDeviation: -1}), "new CanvasFilter({name: 'dropShadow', stdDeviation: -1})");
-  _assert(new CanvasFilter({name: 'dropShadow', stdDeviation: 0.5}), "new CanvasFilter({name: 'dropShadow', stdDeviation: 0.5})");
-  _assert(new CanvasFilter({name: 'dropShadow', stdDeviation: null}), "new CanvasFilter({name: 'dropShadow', stdDeviation: null})");
-  _assert(new CanvasFilter({name: 'dropShadow', stdDeviation: true}), "new CanvasFilter({name: 'dropShadow', stdDeviation: true})");
-  _assert(new CanvasFilter({name: 'dropShadow', stdDeviation: false}), "new CanvasFilter({name: 'dropShadow', stdDeviation: false})");
-  _assert(new CanvasFilter({name: 'dropShadow', stdDeviation: []}), "new CanvasFilter({name: 'dropShadow', stdDeviation: []})");
-  _assert(new CanvasFilter({name: 'dropShadow', stdDeviation: [20]}), "new CanvasFilter({name: 'dropShadow', stdDeviation: [\""+(20)+"\"]})");
-  _assert(new CanvasFilter({name: 'dropShadow', stdDeviation: '30'}), "new CanvasFilter({name: 'dropShadow', stdDeviation: '30'})");
-  _assert(new CanvasFilter({name: 'dropShadow', stdDeviation: [10, -1]}), "new CanvasFilter({name: 'dropShadow', stdDeviation: [10, -1]})");
-  _assert(new CanvasFilter({name: 'dropShadow', stdDeviation: [0.5, null]}), "new CanvasFilter({name: 'dropShadow', stdDeviation: [0.5, null]})");
-  _assert(new CanvasFilter({name: 'dropShadow', stdDeviation: [true, false]}), "new CanvasFilter({name: 'dropShadow', stdDeviation: [true, false]})");
-  _assert(new CanvasFilter({name: 'dropShadow', stdDeviation: [[], [20]]}), "new CanvasFilter({name: 'dropShadow', stdDeviation: [[], [\""+(20)+"\"]]})");
-  _assert(new CanvasFilter({name: 'dropShadow', stdDeviation: ['30', ['40']]}), "new CanvasFilter({name: 'dropShadow', stdDeviation: ['30', ['40']]})");
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: 10});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: -1});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: 0.5});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: null});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: true});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: false});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: []});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: [20]});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: '30'});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: [10, -1]});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: [0.5, null]});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: [true, false]});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: [[], [20]]});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: ['30', ['40']]});
   // floodColor
-  _assert(new CanvasFilter({name: 'dropShadow', floodColor: 'red'}), "new CanvasFilter({name: 'dropShadow', floodColor: 'red'})");
-  _assert(new CanvasFilter({name: 'dropShadow', floodColor: 'canvas'}), "new CanvasFilter({name: 'dropShadow', floodColor: 'canvas'})");
-  _assert(new CanvasFilter({name: 'dropShadow', floodColor: 'rgba(4, -3, 0.5, 1)'}), "new CanvasFilter({name: 'dropShadow', floodColor: 'rgba(4, -3, 0.5, 1)'})");
-  _assert(new CanvasFilter({name: 'dropShadow', floodColor: '#aabbccdd'}), "new CanvasFilter({name: 'dropShadow', floodColor: '#aabbccdd'})");
-  _assert(new CanvasFilter({name: 'dropShadow', floodColor: '#abcd'}), "new CanvasFilter({name: 'dropShadow', floodColor: '#abcd'})");
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodColor: 'red'});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodColor: 'canvas'});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodColor: 'rgba(4, -3, 0.5, 1)'});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodColor: '#aabbccdd'});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodColor: '#abcd'});
 
+  // Should throw a TypeError.
   // dx
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', dx: NaN}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', dx: Infinity}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', dx: -Infinity}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', dx: undefined}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', dx: 'test'}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', dx: {}}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', dx: [1, 2]}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: NaN}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: Infinity}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: -Infinity}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: undefined}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: 'test'}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: {}}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: [1, 2]}); });
   // dy
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', dy: NaN}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', dy: Infinity}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', dy: -Infinity}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', dy: undefined}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', dy: 'test'}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', dy: {}}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', dy: [1, 2]}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: NaN}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: Infinity}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: -Infinity}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: undefined}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: 'test'}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: {}}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: [1, 2]}); });
   // floodOpacity
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', floodOpacity: NaN}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', floodOpacity: Infinity}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', floodOpacity: -Infinity}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', floodOpacity: undefined}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', floodOpacity: 'test'}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', floodOpacity: {}}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', floodOpacity: [1, 2]}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: NaN}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: Infinity}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: -Infinity}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: undefined}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: 'test'}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: {}}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: [1, 2]}); });
   // stdDeviation
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', stdDeviation: NaN}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', stdDeviation: Infinity}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', stdDeviation: -Infinity}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', stdDeviation: undefined}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', stdDeviation: 'test'}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', stdDeviation: {}}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', stdDeviation: [1, 2, 3]}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', stdDeviation: [1, NaN]}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', stdDeviation: [1, Infinity]}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', stdDeviation: [1, -Infinity]}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', stdDeviation: [1, undefined]}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', stdDeviation: [1, 'test']}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', stdDeviation: [1, {}]}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', stdDeviation: [1, [2, 3]]}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: NaN}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: Infinity}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: -Infinity}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: undefined}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: 'test'}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: {}}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: [1, 2, 3]}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: [1, NaN]}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: [1, Infinity]}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: [1, -Infinity]}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: [1, undefined]}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: [1, 'test']}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: [1, {}]}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: [1, [2, 3]]}); });
   // floodColor
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', floodColor: 'test'}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', floodColor: 'rgba(NaN, 3, 2, 1)'}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', floodColor: 10}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', floodColor: undefined}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', floodColor: null}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', floodColor: NaN}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodColor: 'test'}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodColor: 'rgba(NaN, 3, 2, 1)'}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodColor: 10}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodColor: undefined}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodColor: null}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodColor: NaN}); });
   t.done();
 
 });
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.dropShadow.exceptions.tentative.worker.js b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.dropShadow.exceptions.tentative.worker.js
index bd18524f28..1d56865e68 100644
--- a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.dropShadow.exceptions.tentative.worker.js
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.dropShadow.exceptions.tentative.worker.js
@@ -16,104 +16,250 @@ t.step(function() {
   var canvas = new OffscreenCanvas(100, 50);
   var ctx = canvas.getContext('2d');
 
+  // Should not throw an error.
   // dx
-  _assert(new CanvasFilter({name: 'dropShadow', dx: 10}), "new CanvasFilter({name: 'dropShadow', dx: 10})");
-  _assert(new CanvasFilter({name: 'dropShadow', dx: -1}), "new CanvasFilter({name: 'dropShadow', dx: -1})");
-  _assert(new CanvasFilter({name: 'dropShadow', dx: 0.5}), "new CanvasFilter({name: 'dropShadow', dx: 0.5})");
-  _assert(new CanvasFilter({name: 'dropShadow', dx: null}), "new CanvasFilter({name: 'dropShadow', dx: null})");
-  _assert(new CanvasFilter({name: 'dropShadow', dx: true}), "new CanvasFilter({name: 'dropShadow', dx: true})");
-  _assert(new CanvasFilter({name: 'dropShadow', dx: false}), "new CanvasFilter({name: 'dropShadow', dx: false})");
-  _assert(new CanvasFilter({name: 'dropShadow', dx: []}), "new CanvasFilter({name: 'dropShadow', dx: []})");
-  _assert(new CanvasFilter({name: 'dropShadow', dx: [20]}), "new CanvasFilter({name: 'dropShadow', dx: [\""+(20)+"\"]})");
-  _assert(new CanvasFilter({name: 'dropShadow', dx: '30'}), "new CanvasFilter({name: 'dropShadow', dx: '30'})");
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: 10});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: -1});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: 0.5});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: null});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: true});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: false});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: []});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: [20]});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: '30'});
   // dy
-  _assert(new CanvasFilter({name: 'dropShadow', dy: 10}), "new CanvasFilter({name: 'dropShadow', dy: 10})");
-  _assert(new CanvasFilter({name: 'dropShadow', dy: -1}), "new CanvasFilter({name: 'dropShadow', dy: -1})");
-  _assert(new CanvasFilter({name: 'dropShadow', dy: 0.5}), "new CanvasFilter({name: 'dropShadow', dy: 0.5})");
-  _assert(new CanvasFilter({name: 'dropShadow', dy: null}), "new CanvasFilter({name: 'dropShadow', dy: null})");
-  _assert(new CanvasFilter({name: 'dropShadow', dy: true}), "new CanvasFilter({name: 'dropShadow', dy: true})");
-  _assert(new CanvasFilter({name: 'dropShadow', dy: false}), "new CanvasFilter({name: 'dropShadow', dy: false})");
-  _assert(new CanvasFilter({name: 'dropShadow', dy: []}), "new CanvasFilter({name: 'dropShadow', dy: []})");
-  _assert(new CanvasFilter({name: 'dropShadow', dy: [20]}), "new CanvasFilter({name: 'dropShadow', dy: [\""+(20)+"\"]})");
-  _assert(new CanvasFilter({name: 'dropShadow', dy: '30'}), "new CanvasFilter({name: 'dropShadow', dy: '30'})");
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: 10});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: -1});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: 0.5});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: null});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: true});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: false});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: []});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: [20]});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: '30'});
   // floodOpacity
-  _assert(new CanvasFilter({name: 'dropShadow', floodOpacity: 10}), "new CanvasFilter({name: 'dropShadow', floodOpacity: 10})");
-  _assert(new CanvasFilter({name: 'dropShadow', floodOpacity: -1}), "new CanvasFilter({name: 'dropShadow', floodOpacity: -1})");
-  _assert(new CanvasFilter({name: 'dropShadow', floodOpacity: 0.5}), "new CanvasFilter({name: 'dropShadow', floodOpacity: 0.5})");
-  _assert(new CanvasFilter({name: 'dropShadow', floodOpacity: null}), "new CanvasFilter({name: 'dropShadow', floodOpacity: null})");
-  _assert(new CanvasFilter({name: 'dropShadow', floodOpacity: true}), "new CanvasFilter({name: 'dropShadow', floodOpacity: true})");
-  _assert(new CanvasFilter({name: 'dropShadow', floodOpacity: false}), "new CanvasFilter({name: 'dropShadow', floodOpacity: false})");
-  _assert(new CanvasFilter({name: 'dropShadow', floodOpacity: []}), "new CanvasFilter({name: 'dropShadow', floodOpacity: []})");
-  _assert(new CanvasFilter({name: 'dropShadow', floodOpacity: [20]}), "new CanvasFilter({name: 'dropShadow', floodOpacity: [\""+(20)+"\"]})");
-  _assert(new CanvasFilter({name: 'dropShadow', floodOpacity: '30'}), "new CanvasFilter({name: 'dropShadow', floodOpacity: '30'})");
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: 10});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: -1});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: 0.5});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: null});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: true});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: false});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: []});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: [20]});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: '30'});
+  // dx
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: 10});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: -1});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: 0.5});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: null});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: true});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: false});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: []});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: [20]});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: '30'});
+  // dy
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: 10});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: -1});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: 0.5});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: null});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: true});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: false});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: []});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: [20]});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: '30'});
+  // floodOpacity
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: 10});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: -1});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: 0.5});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: null});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: true});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: false});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: []});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: [20]});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: '30'});
   // stdDeviation
-  _assert(new CanvasFilter({name: 'dropShadow', stdDeviation: 10}), "new CanvasFilter({name: 'dropShadow', stdDeviation: 10})");
-  _assert(new CanvasFilter({name: 'dropShadow', stdDeviation: -1}), "new CanvasFilter({name: 'dropShadow', stdDeviation: -1})");
-  _assert(new CanvasFilter({name: 'dropShadow', stdDeviation: 0.5}), "new CanvasFilter({name: 'dropShadow', stdDeviation: 0.5})");
-  _assert(new CanvasFilter({name: 'dropShadow', stdDeviation: null}), "new CanvasFilter({name: 'dropShadow', stdDeviation: null})");
-  _assert(new CanvasFilter({name: 'dropShadow', stdDeviation: true}), "new CanvasFilter({name: 'dropShadow', stdDeviation: true})");
-  _assert(new CanvasFilter({name: 'dropShadow', stdDeviation: false}), "new CanvasFilter({name: 'dropShadow', stdDeviation: false})");
-  _assert(new CanvasFilter({name: 'dropShadow', stdDeviation: []}), "new CanvasFilter({name: 'dropShadow', stdDeviation: []})");
-  _assert(new CanvasFilter({name: 'dropShadow', stdDeviation: [20]}), "new CanvasFilter({name: 'dropShadow', stdDeviation: [\""+(20)+"\"]})");
-  _assert(new CanvasFilter({name: 'dropShadow', stdDeviation: '30'}), "new CanvasFilter({name: 'dropShadow', stdDeviation: '30'})");
-  _assert(new CanvasFilter({name: 'dropShadow', stdDeviation: [10, -1]}), "new CanvasFilter({name: 'dropShadow', stdDeviation: [10, -1]})");
-  _assert(new CanvasFilter({name: 'dropShadow', stdDeviation: [0.5, null]}), "new CanvasFilter({name: 'dropShadow', stdDeviation: [0.5, null]})");
-  _assert(new CanvasFilter({name: 'dropShadow', stdDeviation: [true, false]}), "new CanvasFilter({name: 'dropShadow', stdDeviation: [true, false]})");
-  _assert(new CanvasFilter({name: 'dropShadow', stdDeviation: [[], [20]]}), "new CanvasFilter({name: 'dropShadow', stdDeviation: [[], [\""+(20)+"\"]]})");
-  _assert(new CanvasFilter({name: 'dropShadow', stdDeviation: ['30', ['40']]}), "new CanvasFilter({name: 'dropShadow', stdDeviation: ['30', ['40']]})");
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: 10});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: -1});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: 0.5});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: null});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: true});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: false});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: []});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: [20]});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: '30'});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: [10, -1]});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: [0.5, null]});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: [true, false]});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: [[], [20]]});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: ['30', ['40']]});
   // floodColor
-  _assert(new CanvasFilter({name: 'dropShadow', floodColor: 'red'}), "new CanvasFilter({name: 'dropShadow', floodColor: 'red'})");
-  _assert(new CanvasFilter({name: 'dropShadow', floodColor: 'canvas'}), "new CanvasFilter({name: 'dropShadow', floodColor: 'canvas'})");
-  _assert(new CanvasFilter({name: 'dropShadow', floodColor: 'rgba(4, -3, 0.5, 1)'}), "new CanvasFilter({name: 'dropShadow', floodColor: 'rgba(4, -3, 0.5, 1)'})");
-  _assert(new CanvasFilter({name: 'dropShadow', floodColor: '#aabbccdd'}), "new CanvasFilter({name: 'dropShadow', floodColor: '#aabbccdd'})");
-  _assert(new CanvasFilter({name: 'dropShadow', floodColor: '#abcd'}), "new CanvasFilter({name: 'dropShadow', floodColor: '#abcd'})");
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodColor: 'red'});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodColor: 'canvas'});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodColor: 'rgba(4, -3, 0.5, 1)'});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodColor: '#aabbccdd'});
+  ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodColor: '#abcd'});
 
+  // Should throw a TypeError.
   // dx
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', dx: NaN}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', dx: Infinity}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', dx: -Infinity}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', dx: undefined}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', dx: 'test'}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', dx: {}}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', dx: [1, 2]}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: NaN}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: Infinity}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: -Infinity}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: undefined}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: 'test'}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: {}}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dx: [1, 2]}); });
   // dy
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', dy: NaN}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', dy: Infinity}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', dy: -Infinity}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', dy: undefined}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', dy: 'test'}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', dy: {}}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', dy: [1, 2]}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: NaN}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: Infinity}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: -Infinity}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: undefined}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: 'test'}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: {}}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', dy: [1, 2]}); });
   // floodOpacity
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', floodOpacity: NaN}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', floodOpacity: Infinity}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', floodOpacity: -Infinity}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', floodOpacity: undefined}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', floodOpacity: 'test'}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', floodOpacity: {}}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', floodOpacity: [1, 2]}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: NaN}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: Infinity}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: -Infinity}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: undefined}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: 'test'}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: {}}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodOpacity: [1, 2]}); });
   // stdDeviation
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', stdDeviation: NaN}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', stdDeviation: Infinity}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', stdDeviation: -Infinity}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', stdDeviation: undefined}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', stdDeviation: 'test'}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', stdDeviation: {}}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', stdDeviation: [1, 2, 3]}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', stdDeviation: [1, NaN]}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', stdDeviation: [1, Infinity]}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', stdDeviation: [1, -Infinity]}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', stdDeviation: [1, undefined]}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', stdDeviation: [1, 'test']}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', stdDeviation: [1, {}]}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', stdDeviation: [1, [2, 3]]}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: NaN}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: Infinity}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: -Infinity}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: undefined}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: 'test'}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: {}}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: [1, 2, 3]}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: [1, NaN]}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: [1, Infinity]}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: [1, -Infinity]}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: [1, undefined]}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: [1, 'test']}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: [1, {}]}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', stdDeviation: [1, [2, 3]]}); });
   // floodColor
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', floodColor: 'test'}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', floodColor: 'rgba(NaN, 3, 2, 1)'}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', floodColor: 10}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', floodColor: undefined}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', floodColor: null}); });
-  assert_throws_js(TypeError, function() { new CanvasFilter({name: 'dropShadow', floodColor: NaN}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodColor: 'test'}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodColor: 'rgba(NaN, 3, 2, 1)'}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodColor: 10}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodColor: undefined}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodColor: null}); });
+  assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(
+    {name: 'dropShadow', floodColor: NaN}); });
   t.done();
 });
 done();
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.dropShadow.tentative.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.dropShadow.tentative.html
index 81eb1eae45..7569304b95 100644
--- a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.dropShadow.tentative.html
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.dropShadow.tentative.html
@@ -22,86 +22,58 @@
   // Parameter defaults.
   ctx.filter = new CanvasFilter({name: 'dropShadow'});
   ctx.fillRect(10, 10, 80, 80);
-
   // All parameters specified.
-  ctx.filter = new CanvasFilter(
-    {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 5,
+  ctx.filter = new CanvasFilter({name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 5,
      floodColor: 'purple', floodOpacity: 0.7});
   ctx.fillRect(110, 10, 80, 80);
-
   // Named color.
-  ctx.filter = new CanvasFilter(
-    {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 3,
+  ctx.filter = new CanvasFilter({name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 3,
      floodColor: 'purple'});
   ctx.fillRect(10, 110, 80, 80);
-
   // System color.
-  ctx.filter = new CanvasFilter(
-    {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 3,
+  ctx.filter = new CanvasFilter({name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 3,
      floodColor: 'LinkText'});
   ctx.fillRect(110, 110, 80, 80);
-
   // Numerical color.
-  ctx.filter = new CanvasFilter(
-    {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 3,
+  ctx.filter = new CanvasFilter({name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 3,
      floodColor: 'rgba(20, 50, 130, 1)'});
   ctx.fillRect(210, 110, 80, 80);
-
   // Transparent floodColor.
-  ctx.filter = new CanvasFilter(
-    {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 3,
+  ctx.filter = new CanvasFilter({name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 3,
      floodColor: 'rgba(20, 50, 130, 0.7)'});
   ctx.fillRect(310, 110, 80, 80);
-
   // Transparent floodColor and floodOpacity.
-  ctx.filter = new CanvasFilter(
-    {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 3,
+  ctx.filter = new CanvasFilter({name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 3,
      floodColor: 'rgba(20, 50, 130, 0.7)', floodOpacity: 0.7});
   ctx.fillRect(410, 110, 80, 80);
-
   // No blur.
-  ctx.filter = new CanvasFilter(
-    {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 0,
+  ctx.filter = new CanvasFilter({name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 0,
      floodColor: 'purple'});
   ctx.fillRect(10, 210, 80, 80);
-
   // Single float blur.
-  ctx.filter = new CanvasFilter(
-    {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 5,
+  ctx.filter = new CanvasFilter({name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 5,
      floodColor: 'purple'});
   ctx.fillRect(110, 210, 80, 80);
-
   // Single negative float blur.
-  ctx.filter = new CanvasFilter(
-    {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: -5,
+  ctx.filter = new CanvasFilter({name: 'dropShadow', dx: 9, dy: 12, stdDeviation: -5,
      floodColor: 'purple'});
   ctx.fillRect(210, 210, 80, 80);
-
   // Two floats (X&Y) blur.
-  ctx.filter = new CanvasFilter(
-    {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: [3, 5],
+  ctx.filter = new CanvasFilter({name: 'dropShadow', dx: 9, dy: 12, stdDeviation: [3, 5],
      floodColor: 'purple'});
   ctx.fillRect(310, 210, 80, 80);
-
   // Two negative floats (X&Y) blur.
-  ctx.filter = new CanvasFilter(
-    {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: [-3, -5],
+  ctx.filter = new CanvasFilter({name: 'dropShadow', dx: 9, dy: 12, stdDeviation: [-3, -5],
      floodColor: 'purple'});
   ctx.fillRect(410, 210, 80, 80);
-
   // Degenerate parameter values.
-  ctx.filter = new CanvasFilter(
-    {name: 'dropShadow', dx: [-5], dy: [], stdDeviation: null,
+  ctx.filter = new CanvasFilter({name: 'dropShadow', dx: [-5], dy: [], stdDeviation: null,
      floodColor: 'purple', floodOpacity: [2]});
   ctx.fillRect(10, 310, 80, 80);
-
-  ctx.filter = new CanvasFilter(
-    {name: 'dropShadow', dx: null, dy: '5', stdDeviation: [[-5], ['3']],
+  ctx.filter = new CanvasFilter({name: 'dropShadow', dx: null, dy: '5', stdDeviation: [[-5], ['3']],
      floodColor: 'purple', floodOpacity: '0.8'});
   ctx.fillRect(110, 310, 80, 80);
-
-  ctx.filter = new CanvasFilter(
-    {name: 'dropShadow', dx: true, dy: ['10'], stdDeviation: false,
+  ctx.filter = new CanvasFilter({name: 'dropShadow', dx: true, dy: ['10'], stdDeviation: false,
      floodColor: 'purple', floodOpacity: ['0.4']});
   ctx.fillRect(210, 310, 80, 80);
 
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.dropShadow.tentative.w.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.dropShadow.tentative.w.html
index fe9087244a..2a26af4ec3 100644
--- a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.dropShadow.tentative.w.html
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.dropShadow.tentative.w.html
@@ -24,86 +24,58 @@
     // Parameter defaults.
     ctx.filter = new CanvasFilter({name: 'dropShadow'});
     ctx.fillRect(10, 10, 80, 80);
-
     // All parameters specified.
-    ctx.filter = new CanvasFilter(
-      {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 5,
+    ctx.filter = new CanvasFilter({name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 5,
        floodColor: 'purple', floodOpacity: 0.7});
     ctx.fillRect(110, 10, 80, 80);
-
     // Named color.
-    ctx.filter = new CanvasFilter(
-      {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 3,
+    ctx.filter = new CanvasFilter({name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 3,
        floodColor: 'purple'});
     ctx.fillRect(10, 110, 80, 80);
-
     // System color.
-    ctx.filter = new CanvasFilter(
-      {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 3,
+    ctx.filter = new CanvasFilter({name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 3,
        floodColor: 'LinkText'});
     ctx.fillRect(110, 110, 80, 80);
-
     // Numerical color.
-    ctx.filter = new CanvasFilter(
-      {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 3,
+    ctx.filter = new CanvasFilter({name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 3,
        floodColor: 'rgba(20, 50, 130, 1)'});
     ctx.fillRect(210, 110, 80, 80);
-
     // Transparent floodColor.
-    ctx.filter = new CanvasFilter(
-      {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 3,
+    ctx.filter = new CanvasFilter({name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 3,
        floodColor: 'rgba(20, 50, 130, 0.7)'});
     ctx.fillRect(310, 110, 80, 80);
-
     // Transparent floodColor and floodOpacity.
-    ctx.filter = new CanvasFilter(
-      {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 3,
+    ctx.filter = new CanvasFilter({name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 3,
        floodColor: 'rgba(20, 50, 130, 0.7)', floodOpacity: 0.7});
     ctx.fillRect(410, 110, 80, 80);
-
     // No blur.
-    ctx.filter = new CanvasFilter(
-      {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 0,
+    ctx.filter = new CanvasFilter({name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 0,
        floodColor: 'purple'});
     ctx.fillRect(10, 210, 80, 80);
-
     // Single float blur.
-    ctx.filter = new CanvasFilter(
-      {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 5,
+    ctx.filter = new CanvasFilter({name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 5,
        floodColor: 'purple'});
     ctx.fillRect(110, 210, 80, 80);
-
     // Single negative float blur.
-    ctx.filter = new CanvasFilter(
-      {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: -5,
+    ctx.filter = new CanvasFilter({name: 'dropShadow', dx: 9, dy: 12, stdDeviation: -5,
        floodColor: 'purple'});
     ctx.fillRect(210, 210, 80, 80);
-
     // Two floats (X&Y) blur.
-    ctx.filter = new CanvasFilter(
-      {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: [3, 5],
+    ctx.filter = new CanvasFilter({name: 'dropShadow', dx: 9, dy: 12, stdDeviation: [3, 5],
        floodColor: 'purple'});
     ctx.fillRect(310, 210, 80, 80);
-
     // Two negative floats (X&Y) blur.
-    ctx.filter = new CanvasFilter(
-      {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: [-3, -5],
+    ctx.filter = new CanvasFilter({name: 'dropShadow', dx: 9, dy: 12, stdDeviation: [-3, -5],
        floodColor: 'purple'});
     ctx.fillRect(410, 210, 80, 80);
-
     // Degenerate parameter values.
-    ctx.filter = new CanvasFilter(
-      {name: 'dropShadow', dx: [-5], dy: [], stdDeviation: null,
+    ctx.filter = new CanvasFilter({name: 'dropShadow', dx: [-5], dy: [], stdDeviation: null,
        floodColor: 'purple', floodOpacity: [2]});
     ctx.fillRect(10, 310, 80, 80);
-
-    ctx.filter = new CanvasFilter(
-      {name: 'dropShadow', dx: null, dy: '5', stdDeviation: [[-5], ['3']],
+    ctx.filter = new CanvasFilter({name: 'dropShadow', dx: null, dy: '5', stdDeviation: [[-5], ['3']],
        floodColor: 'purple', floodOpacity: '0.8'});
     ctx.fillRect(110, 310, 80, 80);
-
-    ctx.filter = new CanvasFilter(
-      {name: 'dropShadow', dx: true, dy: ['10'], stdDeviation: false,
+    ctx.filter = new CanvasFilter({name: 'dropShadow', dx: true, dy: ['10'], stdDeviation: false,
        floodColor: 'purple', floodOpacity: ['0.4']});
     ctx.fillRect(210, 310, 80, 80);
 
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.isotropic.tentative-expected.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.isotropic.tentative-expected.html
new file mode 100644
index 0000000000..dac31c97f1
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.isotropic.tentative-expected.html
@@ -0,0 +1,15 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>Canvas test: 2d.filter.canvasFilterObject.gaussianBlur.isotropic.tentative</title>
+<h1>2d.filter.canvasFilterObject.gaussianBlur.isotropic.tentative</h1>
+<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
+
+<svg xmlns="http://www.w3.org/2000/svg"
+     width="100" height="100"
+     color-interpolation-filters="sRGB">
+  <filter id="blur" x="-50%" y="-50%" width="200%" height="200%">
+    <feGaussianBlur stdDeviation="4 4" />
+  </filter>
+  <rect x="25" y="25" width="50" height="50"
+        fill="teal" filter="url(#blur)" />
+</svg>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.isotropic.tentative.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.isotropic.tentative.html
new file mode 100644
index 0000000000..801e6fdb8c
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.isotropic.tentative.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<link rel="match" href="2d.filter.canvasFilterObject.gaussianBlur.isotropic.tentative-expected.html">
+<title>Canvas test: 2d.filter.canvasFilterObject.gaussianBlur.isotropic.tentative</title>
+<h1>2d.filter.canvasFilterObject.gaussianBlur.isotropic.tentative</h1>
+<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = new OffscreenCanvas(100, 100);
+  const ctx = canvas.getContext('2d');
+
+  ctx.fillStyle = 'teal';
+  ctx.filter = new CanvasFilter({
+      name: 'gaussianBlur',
+      stdDeviation: [4, 4],
+  });
+  ctx.fillRect(25, 25, 50, 50);
+
+  const outputCanvas = document.getElementById("canvas");
+  outputCanvas.getContext('2d').drawImage(canvas, 0, 0);
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.isotropic.tentative.w.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.isotropic.tentative.w.html
new file mode 100644
index 0000000000..6c7c7f7649
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.isotropic.tentative.w.html
@@ -0,0 +1,37 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<html class="reftest-wait">
+<link rel="match" href="2d.filter.canvasFilterObject.gaussianBlur.isotropic.tentative-expected.html">
+<title>Canvas test: 2d.filter.canvasFilterObject.gaussianBlur.isotropic.tentative</title>
+<h1>2d.filter.canvasFilterObject.gaussianBlur.isotropic.tentative</h1>
+<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script id='myWorker' type='text/worker'>
+  self.onmessage = function(e) {
+    const canvas = new OffscreenCanvas(100, 100);
+    const ctx = canvas.getContext('2d');
+
+    ctx.fillStyle = 'teal';
+    ctx.filter = new CanvasFilter({
+        name: 'gaussianBlur',
+        stdDeviation: [4, 4],
+    });
+    ctx.fillRect(25, 25, 50, 50);
+
+    const bitmap = canvas.transferToImageBitmap();
+    self.postMessage(bitmap, bitmap);
+  };
+</script>
+<script>
+  const blob = new Blob([document.getElementById('myWorker').textContent]);
+  const worker = new Worker(URL.createObjectURL(blob));
+  worker.addEventListener('message', msg => {
+    const outputCtx = document.getElementById("canvas").getContext('2d');
+    outputCtx.drawImage(msg.data, 0, 0);
+    document.documentElement.classList.remove("reftest-wait");
+  });
+  worker.postMessage(null);
+</script>
+</html>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.mostly-x.tentative-expected.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.mostly-x.tentative-expected.html
new file mode 100644
index 0000000000..88d0cb2de2
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.mostly-x.tentative-expected.html
@@ -0,0 +1,15 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>Canvas test: 2d.filter.canvasFilterObject.gaussianBlur.mostly-x.tentative</title>
+<h1>2d.filter.canvasFilterObject.gaussianBlur.mostly-x.tentative</h1>
+<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
+
+<svg xmlns="http://www.w3.org/2000/svg"
+     width="100" height="100"
+     color-interpolation-filters="sRGB">
+  <filter id="blur" x="-50%" y="-50%" width="200%" height="200%">
+    <feGaussianBlur stdDeviation="4 1" />
+  </filter>
+  <rect x="25" y="25" width="50" height="50"
+        fill="teal" filter="url(#blur)" />
+</svg>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.mostly-x.tentative.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.mostly-x.tentative.html
new file mode 100644
index 0000000000..ba986d8e7b
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.mostly-x.tentative.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<link rel="match" href="2d.filter.canvasFilterObject.gaussianBlur.mostly-x.tentative-expected.html">
+<title>Canvas test: 2d.filter.canvasFilterObject.gaussianBlur.mostly-x.tentative</title>
+<h1>2d.filter.canvasFilterObject.gaussianBlur.mostly-x.tentative</h1>
+<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = new OffscreenCanvas(100, 100);
+  const ctx = canvas.getContext('2d');
+
+  ctx.fillStyle = 'teal';
+  ctx.filter = new CanvasFilter({
+      name: 'gaussianBlur',
+      stdDeviation: [4, 1],
+  });
+  ctx.fillRect(25, 25, 50, 50);
+
+  const outputCanvas = document.getElementById("canvas");
+  outputCanvas.getContext('2d').drawImage(canvas, 0, 0);
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.mostly-x.tentative.w.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.mostly-x.tentative.w.html
new file mode 100644
index 0000000000..86fe086327
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.mostly-x.tentative.w.html
@@ -0,0 +1,37 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<html class="reftest-wait">
+<link rel="match" href="2d.filter.canvasFilterObject.gaussianBlur.mostly-x.tentative-expected.html">
+<title>Canvas test: 2d.filter.canvasFilterObject.gaussianBlur.mostly-x.tentative</title>
+<h1>2d.filter.canvasFilterObject.gaussianBlur.mostly-x.tentative</h1>
+<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script id='myWorker' type='text/worker'>
+  self.onmessage = function(e) {
+    const canvas = new OffscreenCanvas(100, 100);
+    const ctx = canvas.getContext('2d');
+
+    ctx.fillStyle = 'teal';
+    ctx.filter = new CanvasFilter({
+        name: 'gaussianBlur',
+        stdDeviation: [4, 1],
+    });
+    ctx.fillRect(25, 25, 50, 50);
+
+    const bitmap = canvas.transferToImageBitmap();
+    self.postMessage(bitmap, bitmap);
+  };
+</script>
+<script>
+  const blob = new Blob([document.getElementById('myWorker').textContent]);
+  const worker = new Worker(URL.createObjectURL(blob));
+  worker.addEventListener('message', msg => {
+    const outputCtx = document.getElementById("canvas").getContext('2d');
+    outputCtx.drawImage(msg.data, 0, 0);
+    document.documentElement.classList.remove("reftest-wait");
+  });
+  worker.postMessage(null);
+</script>
+</html>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.mostly-y.tentative-expected.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.mostly-y.tentative-expected.html
new file mode 100644
index 0000000000..744983d4ae
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.mostly-y.tentative-expected.html
@@ -0,0 +1,15 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>Canvas test: 2d.filter.canvasFilterObject.gaussianBlur.mostly-y.tentative</title>
+<h1>2d.filter.canvasFilterObject.gaussianBlur.mostly-y.tentative</h1>
+<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
+
+<svg xmlns="http://www.w3.org/2000/svg"
+     width="100" height="100"
+     color-interpolation-filters="sRGB">
+  <filter id="blur" x="-50%" y="-50%" width="200%" height="200%">
+    <feGaussianBlur stdDeviation="1 4" />
+  </filter>
+  <rect x="25" y="25" width="50" height="50"
+        fill="teal" filter="url(#blur)" />
+</svg>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.mostly-y.tentative.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.mostly-y.tentative.html
new file mode 100644
index 0000000000..0265cfa6c4
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.mostly-y.tentative.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<link rel="match" href="2d.filter.canvasFilterObject.gaussianBlur.mostly-y.tentative-expected.html">
+<title>Canvas test: 2d.filter.canvasFilterObject.gaussianBlur.mostly-y.tentative</title>
+<h1>2d.filter.canvasFilterObject.gaussianBlur.mostly-y.tentative</h1>
+<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = new OffscreenCanvas(100, 100);
+  const ctx = canvas.getContext('2d');
+
+  ctx.fillStyle = 'teal';
+  ctx.filter = new CanvasFilter({
+      name: 'gaussianBlur',
+      stdDeviation: [1, 4],
+  });
+  ctx.fillRect(25, 25, 50, 50);
+
+  const outputCanvas = document.getElementById("canvas");
+  outputCanvas.getContext('2d').drawImage(canvas, 0, 0);
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.mostly-y.tentative.w.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.mostly-y.tentative.w.html
new file mode 100644
index 0000000000..c22b320857
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.mostly-y.tentative.w.html
@@ -0,0 +1,37 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<html class="reftest-wait">
+<link rel="match" href="2d.filter.canvasFilterObject.gaussianBlur.mostly-y.tentative-expected.html">
+<title>Canvas test: 2d.filter.canvasFilterObject.gaussianBlur.mostly-y.tentative</title>
+<h1>2d.filter.canvasFilterObject.gaussianBlur.mostly-y.tentative</h1>
+<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script id='myWorker' type='text/worker'>
+  self.onmessage = function(e) {
+    const canvas = new OffscreenCanvas(100, 100);
+    const ctx = canvas.getContext('2d');
+
+    ctx.fillStyle = 'teal';
+    ctx.filter = new CanvasFilter({
+        name: 'gaussianBlur',
+        stdDeviation: [1, 4],
+    });
+    ctx.fillRect(25, 25, 50, 50);
+
+    const bitmap = canvas.transferToImageBitmap();
+    self.postMessage(bitmap, bitmap);
+  };
+</script>
+<script>
+  const blob = new Blob([document.getElementById('myWorker').textContent]);
+  const worker = new Worker(URL.createObjectURL(blob));
+  worker.addEventListener('message', msg => {
+    const outputCtx = document.getElementById("canvas").getContext('2d');
+    outputCtx.drawImage(msg.data, 0, 0);
+    document.documentElement.classList.remove("reftest-wait");
+  });
+  worker.postMessage(null);
+</script>
+</html>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.isotropic-expected.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.isotropic-expected.html
deleted file mode 100644
index f9571f208e..0000000000
--- a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.isotropic-expected.html
+++ /dev/null
@@ -1,15 +0,0 @@
-<!DOCTYPE html>
-<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
-<title>Canvas test: 2d.filter.canvasFilterObject.gaussianBlur.tentative.isotropic</title>
-<h1>2d.filter.canvasFilterObject.gaussianBlur.tentative.isotropic</h1>
-<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
-
-<svg xmlns="http://www.w3.org/2000/svg"
-     width="100" height="100"
-     color-interpolation-filters="sRGB">
-  <filter id="blur" x="-50%" y="-50%" width="200%" height="200%">
-    <feGaussianBlur stdDeviation="4 4" />
-  </filter>
-  <rect x="25" y="25" width="50" height="50"
-        fill="teal" filter="url(#blur)" />
-</svg>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.isotropic.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.isotropic.html
deleted file mode 100644
index 4417a1917c..0000000000
--- a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.isotropic.html
+++ /dev/null
@@ -1,23 +0,0 @@
-<!DOCTYPE html>
-<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
-<link rel="match" href="2d.filter.canvasFilterObject.gaussianBlur.tentative.isotropic-expected.html">
-<title>Canvas test: 2d.filter.canvasFilterObject.gaussianBlur.tentative.isotropic</title>
-<h1>2d.filter.canvasFilterObject.gaussianBlur.tentative.isotropic</h1>
-<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
-<canvas id="canvas" width="100" height="100">
-  <p class="fallback">FAIL (fallback content)</p>
-</canvas>
-<script>
-  const canvas = new OffscreenCanvas(100, 100);
-  const ctx = canvas.getContext('2d');
-
-  ctx.fillStyle = 'teal';
-  ctx.filter = new CanvasFilter({
-      name: 'gaussianBlur',
-      stdDeviation: [4, 4],
-  });
-  ctx.fillRect(25, 25, 50, 50);
-
-  const outputCanvas = document.getElementById("canvas");
-  outputCanvas.getContext('2d').drawImage(canvas, 0, 0);
-</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.isotropic.w.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.isotropic.w.html
deleted file mode 100644
index d2024ad205..0000000000
--- a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.isotropic.w.html
+++ /dev/null
@@ -1,37 +0,0 @@
-<!DOCTYPE html>
-<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
-<html class="reftest-wait">
-<link rel="match" href="2d.filter.canvasFilterObject.gaussianBlur.tentative.isotropic-expected.html">
-<title>Canvas test: 2d.filter.canvasFilterObject.gaussianBlur.tentative.isotropic</title>
-<h1>2d.filter.canvasFilterObject.gaussianBlur.tentative.isotropic</h1>
-<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
-<canvas id="canvas" width="100" height="100">
-  <p class="fallback">FAIL (fallback content)</p>
-</canvas>
-<script id='myWorker' type='text/worker'>
-  self.onmessage = function(e) {
-    const canvas = new OffscreenCanvas(100, 100);
-    const ctx = canvas.getContext('2d');
-
-    ctx.fillStyle = 'teal';
-    ctx.filter = new CanvasFilter({
-        name: 'gaussianBlur',
-        stdDeviation: [4, 4],
-    });
-    ctx.fillRect(25, 25, 50, 50);
-
-    const bitmap = canvas.transferToImageBitmap();
-    self.postMessage(bitmap, bitmap);
-  };
-</script>
-<script>
-  const blob = new Blob([document.getElementById('myWorker').textContent]);
-  const worker = new Worker(URL.createObjectURL(blob));
-  worker.addEventListener('message', msg => {
-    const outputCtx = document.getElementById("canvas").getContext('2d');
-    outputCtx.drawImage(msg.data, 0, 0);
-    document.documentElement.classList.remove("reftest-wait");
-  });
-  worker.postMessage(null);
-</script>
-</html>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.mostly-x-expected.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.mostly-x-expected.html
deleted file mode 100644
index e76613271f..0000000000
--- a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.mostly-x-expected.html
+++ /dev/null
@@ -1,15 +0,0 @@
-<!DOCTYPE html>
-<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
-<title>Canvas test: 2d.filter.canvasFilterObject.gaussianBlur.tentative.mostly-x</title>
-<h1>2d.filter.canvasFilterObject.gaussianBlur.tentative.mostly-x</h1>
-<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
-
-<svg xmlns="http://www.w3.org/2000/svg"
-     width="100" height="100"
-     color-interpolation-filters="sRGB">
-  <filter id="blur" x="-50%" y="-50%" width="200%" height="200%">
-    <feGaussianBlur stdDeviation="4 1" />
-  </filter>
-  <rect x="25" y="25" width="50" height="50"
-        fill="teal" filter="url(#blur)" />
-</svg>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.mostly-x.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.mostly-x.html
deleted file mode 100644
index 2ea26359fe..0000000000
--- a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.mostly-x.html
+++ /dev/null
@@ -1,23 +0,0 @@
-<!DOCTYPE html>
-<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
-<link rel="match" href="2d.filter.canvasFilterObject.gaussianBlur.tentative.mostly-x-expected.html">
-<title>Canvas test: 2d.filter.canvasFilterObject.gaussianBlur.tentative.mostly-x</title>
-<h1>2d.filter.canvasFilterObject.gaussianBlur.tentative.mostly-x</h1>
-<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
-<canvas id="canvas" width="100" height="100">
-  <p class="fallback">FAIL (fallback content)</p>
-</canvas>
-<script>
-  const canvas = new OffscreenCanvas(100, 100);
-  const ctx = canvas.getContext('2d');
-
-  ctx.fillStyle = 'teal';
-  ctx.filter = new CanvasFilter({
-      name: 'gaussianBlur',
-      stdDeviation: [4, 1],
-  });
-  ctx.fillRect(25, 25, 50, 50);
-
-  const outputCanvas = document.getElementById("canvas");
-  outputCanvas.getContext('2d').drawImage(canvas, 0, 0);
-</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.mostly-x.w.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.mostly-x.w.html
deleted file mode 100644
index fa49ea4682..0000000000
--- a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.mostly-x.w.html
+++ /dev/null
@@ -1,37 +0,0 @@
-<!DOCTYPE html>
-<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
-<html class="reftest-wait">
-<link rel="match" href="2d.filter.canvasFilterObject.gaussianBlur.tentative.mostly-x-expected.html">
-<title>Canvas test: 2d.filter.canvasFilterObject.gaussianBlur.tentative.mostly-x</title>
-<h1>2d.filter.canvasFilterObject.gaussianBlur.tentative.mostly-x</h1>
-<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
-<canvas id="canvas" width="100" height="100">
-  <p class="fallback">FAIL (fallback content)</p>
-</canvas>
-<script id='myWorker' type='text/worker'>
-  self.onmessage = function(e) {
-    const canvas = new OffscreenCanvas(100, 100);
-    const ctx = canvas.getContext('2d');
-
-    ctx.fillStyle = 'teal';
-    ctx.filter = new CanvasFilter({
-        name: 'gaussianBlur',
-        stdDeviation: [4, 1],
-    });
-    ctx.fillRect(25, 25, 50, 50);
-
-    const bitmap = canvas.transferToImageBitmap();
-    self.postMessage(bitmap, bitmap);
-  };
-</script>
-<script>
-  const blob = new Blob([document.getElementById('myWorker').textContent]);
-  const worker = new Worker(URL.createObjectURL(blob));
-  worker.addEventListener('message', msg => {
-    const outputCtx = document.getElementById("canvas").getContext('2d');
-    outputCtx.drawImage(msg.data, 0, 0);
-    document.documentElement.classList.remove("reftest-wait");
-  });
-  worker.postMessage(null);
-</script>
-</html>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.mostly-y-expected.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.mostly-y-expected.html
deleted file mode 100644
index 0f214fca9f..0000000000
--- a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.mostly-y-expected.html
+++ /dev/null
@@ -1,15 +0,0 @@
-<!DOCTYPE html>
-<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
-<title>Canvas test: 2d.filter.canvasFilterObject.gaussianBlur.tentative.mostly-y</title>
-<h1>2d.filter.canvasFilterObject.gaussianBlur.tentative.mostly-y</h1>
-<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
-
-<svg xmlns="http://www.w3.org/2000/svg"
-     width="100" height="100"
-     color-interpolation-filters="sRGB">
-  <filter id="blur" x="-50%" y="-50%" width="200%" height="200%">
-    <feGaussianBlur stdDeviation="1 4" />
-  </filter>
-  <rect x="25" y="25" width="50" height="50"
-        fill="teal" filter="url(#blur)" />
-</svg>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.mostly-y.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.mostly-y.html
deleted file mode 100644
index a9783ccb6a..0000000000
--- a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.mostly-y.html
+++ /dev/null
@@ -1,23 +0,0 @@
-<!DOCTYPE html>
-<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
-<link rel="match" href="2d.filter.canvasFilterObject.gaussianBlur.tentative.mostly-y-expected.html">
-<title>Canvas test: 2d.filter.canvasFilterObject.gaussianBlur.tentative.mostly-y</title>
-<h1>2d.filter.canvasFilterObject.gaussianBlur.tentative.mostly-y</h1>
-<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
-<canvas id="canvas" width="100" height="100">
-  <p class="fallback">FAIL (fallback content)</p>
-</canvas>
-<script>
-  const canvas = new OffscreenCanvas(100, 100);
-  const ctx = canvas.getContext('2d');
-
-  ctx.fillStyle = 'teal';
-  ctx.filter = new CanvasFilter({
-      name: 'gaussianBlur',
-      stdDeviation: [1, 4],
-  });
-  ctx.fillRect(25, 25, 50, 50);
-
-  const outputCanvas = document.getElementById("canvas");
-  outputCanvas.getContext('2d').drawImage(canvas, 0, 0);
-</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.mostly-y.w.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.mostly-y.w.html
deleted file mode 100644
index ab83f50ea0..0000000000
--- a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.mostly-y.w.html
+++ /dev/null
@@ -1,37 +0,0 @@
-<!DOCTYPE html>
-<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
-<html class="reftest-wait">
-<link rel="match" href="2d.filter.canvasFilterObject.gaussianBlur.tentative.mostly-y-expected.html">
-<title>Canvas test: 2d.filter.canvasFilterObject.gaussianBlur.tentative.mostly-y</title>
-<h1>2d.filter.canvasFilterObject.gaussianBlur.tentative.mostly-y</h1>
-<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
-<canvas id="canvas" width="100" height="100">
-  <p class="fallback">FAIL (fallback content)</p>
-</canvas>
-<script id='myWorker' type='text/worker'>
-  self.onmessage = function(e) {
-    const canvas = new OffscreenCanvas(100, 100);
-    const ctx = canvas.getContext('2d');
-
-    ctx.fillStyle = 'teal';
-    ctx.filter = new CanvasFilter({
-        name: 'gaussianBlur',
-        stdDeviation: [1, 4],
-    });
-    ctx.fillRect(25, 25, 50, 50);
-
-    const bitmap = canvas.transferToImageBitmap();
-    self.postMessage(bitmap, bitmap);
-  };
-</script>
-<script>
-  const blob = new Blob([document.getElementById('myWorker').textContent]);
-  const worker = new Worker(URL.createObjectURL(blob));
-  worker.addEventListener('message', msg => {
-    const outputCtx = document.getElementById("canvas").getContext('2d');
-    outputCtx.drawImage(msg.data, 0, 0);
-    document.documentElement.classList.remove("reftest-wait");
-  });
-  worker.postMessage(null);
-</script>
-</html>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.x-only-expected.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.x-only-expected.html
deleted file mode 100644
index 285a641726..0000000000
--- a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.x-only-expected.html
+++ /dev/null
@@ -1,15 +0,0 @@
-<!DOCTYPE html>
-<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
-<title>Canvas test: 2d.filter.canvasFilterObject.gaussianBlur.tentative.x-only</title>
-<h1>2d.filter.canvasFilterObject.gaussianBlur.tentative.x-only</h1>
-<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
-
-<svg xmlns="http://www.w3.org/2000/svg"
-     width="100" height="100"
-     color-interpolation-filters="sRGB">
-  <filter id="blur" x="-50%" y="-50%" width="200%" height="200%">
-    <feGaussianBlur stdDeviation="4 0" />
-  </filter>
-  <rect x="25" y="25" width="50" height="50"
-        fill="teal" filter="url(#blur)" />
-</svg>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.x-only.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.x-only.html
deleted file mode 100644
index 3028c2a700..0000000000
--- a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.x-only.html
+++ /dev/null
@@ -1,23 +0,0 @@
-<!DOCTYPE html>
-<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
-<link rel="match" href="2d.filter.canvasFilterObject.gaussianBlur.tentative.x-only-expected.html">
-<title>Canvas test: 2d.filter.canvasFilterObject.gaussianBlur.tentative.x-only</title>
-<h1>2d.filter.canvasFilterObject.gaussianBlur.tentative.x-only</h1>
-<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
-<canvas id="canvas" width="100" height="100">
-  <p class="fallback">FAIL (fallback content)</p>
-</canvas>
-<script>
-  const canvas = new OffscreenCanvas(100, 100);
-  const ctx = canvas.getContext('2d');
-
-  ctx.fillStyle = 'teal';
-  ctx.filter = new CanvasFilter({
-      name: 'gaussianBlur',
-      stdDeviation: [4, 0],
-  });
-  ctx.fillRect(25, 25, 50, 50);
-
-  const outputCanvas = document.getElementById("canvas");
-  outputCanvas.getContext('2d').drawImage(canvas, 0, 0);
-</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.x-only.w.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.x-only.w.html
deleted file mode 100644
index e8482cf3ed..0000000000
--- a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.x-only.w.html
+++ /dev/null
@@ -1,37 +0,0 @@
-<!DOCTYPE html>
-<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
-<html class="reftest-wait">
-<link rel="match" href="2d.filter.canvasFilterObject.gaussianBlur.tentative.x-only-expected.html">
-<title>Canvas test: 2d.filter.canvasFilterObject.gaussianBlur.tentative.x-only</title>
-<h1>2d.filter.canvasFilterObject.gaussianBlur.tentative.x-only</h1>
-<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
-<canvas id="canvas" width="100" height="100">
-  <p class="fallback">FAIL (fallback content)</p>
-</canvas>
-<script id='myWorker' type='text/worker'>
-  self.onmessage = function(e) {
-    const canvas = new OffscreenCanvas(100, 100);
-    const ctx = canvas.getContext('2d');
-
-    ctx.fillStyle = 'teal';
-    ctx.filter = new CanvasFilter({
-        name: 'gaussianBlur',
-        stdDeviation: [4, 0],
-    });
-    ctx.fillRect(25, 25, 50, 50);
-
-    const bitmap = canvas.transferToImageBitmap();
-    self.postMessage(bitmap, bitmap);
-  };
-</script>
-<script>
-  const blob = new Blob([document.getElementById('myWorker').textContent]);
-  const worker = new Worker(URL.createObjectURL(blob));
-  worker.addEventListener('message', msg => {
-    const outputCtx = document.getElementById("canvas").getContext('2d');
-    outputCtx.drawImage(msg.data, 0, 0);
-    document.documentElement.classList.remove("reftest-wait");
-  });
-  worker.postMessage(null);
-</script>
-</html>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.y-only-expected.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.y-only-expected.html
deleted file mode 100644
index d59945b5da..0000000000
--- a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.y-only-expected.html
+++ /dev/null
@@ -1,15 +0,0 @@
-<!DOCTYPE html>
-<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
-<title>Canvas test: 2d.filter.canvasFilterObject.gaussianBlur.tentative.y-only</title>
-<h1>2d.filter.canvasFilterObject.gaussianBlur.tentative.y-only</h1>
-<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
-
-<svg xmlns="http://www.w3.org/2000/svg"
-     width="100" height="100"
-     color-interpolation-filters="sRGB">
-  <filter id="blur" x="-50%" y="-50%" width="200%" height="200%">
-    <feGaussianBlur stdDeviation="0 4" />
-  </filter>
-  <rect x="25" y="25" width="50" height="50"
-        fill="teal" filter="url(#blur)" />
-</svg>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.y-only.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.y-only.html
deleted file mode 100644
index fca324716b..0000000000
--- a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.y-only.html
+++ /dev/null
@@ -1,23 +0,0 @@
-<!DOCTYPE html>
-<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
-<link rel="match" href="2d.filter.canvasFilterObject.gaussianBlur.tentative.y-only-expected.html">
-<title>Canvas test: 2d.filter.canvasFilterObject.gaussianBlur.tentative.y-only</title>
-<h1>2d.filter.canvasFilterObject.gaussianBlur.tentative.y-only</h1>
-<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
-<canvas id="canvas" width="100" height="100">
-  <p class="fallback">FAIL (fallback content)</p>
-</canvas>
-<script>
-  const canvas = new OffscreenCanvas(100, 100);
-  const ctx = canvas.getContext('2d');
-
-  ctx.fillStyle = 'teal';
-  ctx.filter = new CanvasFilter({
-      name: 'gaussianBlur',
-      stdDeviation: [0, 4],
-  });
-  ctx.fillRect(25, 25, 50, 50);
-
-  const outputCanvas = document.getElementById("canvas");
-  outputCanvas.getContext('2d').drawImage(canvas, 0, 0);
-</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.y-only.w.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.y-only.w.html
deleted file mode 100644
index 50cfb3083a..0000000000
--- a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.tentative.y-only.w.html
+++ /dev/null
@@ -1,37 +0,0 @@
-<!DOCTYPE html>
-<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
-<html class="reftest-wait">
-<link rel="match" href="2d.filter.canvasFilterObject.gaussianBlur.tentative.y-only-expected.html">
-<title>Canvas test: 2d.filter.canvasFilterObject.gaussianBlur.tentative.y-only</title>
-<h1>2d.filter.canvasFilterObject.gaussianBlur.tentative.y-only</h1>
-<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
-<canvas id="canvas" width="100" height="100">
-  <p class="fallback">FAIL (fallback content)</p>
-</canvas>
-<script id='myWorker' type='text/worker'>
-  self.onmessage = function(e) {
-    const canvas = new OffscreenCanvas(100, 100);
-    const ctx = canvas.getContext('2d');
-
-    ctx.fillStyle = 'teal';
-    ctx.filter = new CanvasFilter({
-        name: 'gaussianBlur',
-        stdDeviation: [0, 4],
-    });
-    ctx.fillRect(25, 25, 50, 50);
-
-    const bitmap = canvas.transferToImageBitmap();
-    self.postMessage(bitmap, bitmap);
-  };
-</script>
-<script>
-  const blob = new Blob([document.getElementById('myWorker').textContent]);
-  const worker = new Worker(URL.createObjectURL(blob));
-  worker.addEventListener('message', msg => {
-    const outputCtx = document.getElementById("canvas").getContext('2d');
-    outputCtx.drawImage(msg.data, 0, 0);
-    document.documentElement.classList.remove("reftest-wait");
-  });
-  worker.postMessage(null);
-</script>
-</html>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.x-only.tentative-expected.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.x-only.tentative-expected.html
new file mode 100644
index 0000000000..e611113e42
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.x-only.tentative-expected.html
@@ -0,0 +1,15 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>Canvas test: 2d.filter.canvasFilterObject.gaussianBlur.x-only.tentative</title>
+<h1>2d.filter.canvasFilterObject.gaussianBlur.x-only.tentative</h1>
+<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
+
+<svg xmlns="http://www.w3.org/2000/svg"
+     width="100" height="100"
+     color-interpolation-filters="sRGB">
+  <filter id="blur" x="-50%" y="-50%" width="200%" height="200%">
+    <feGaussianBlur stdDeviation="4 0" />
+  </filter>
+  <rect x="25" y="25" width="50" height="50"
+        fill="teal" filter="url(#blur)" />
+</svg>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.x-only.tentative.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.x-only.tentative.html
new file mode 100644
index 0000000000..3ed8e9ddf9
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.x-only.tentative.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<link rel="match" href="2d.filter.canvasFilterObject.gaussianBlur.x-only.tentative-expected.html">
+<title>Canvas test: 2d.filter.canvasFilterObject.gaussianBlur.x-only.tentative</title>
+<h1>2d.filter.canvasFilterObject.gaussianBlur.x-only.tentative</h1>
+<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = new OffscreenCanvas(100, 100);
+  const ctx = canvas.getContext('2d');
+
+  ctx.fillStyle = 'teal';
+  ctx.filter = new CanvasFilter({
+      name: 'gaussianBlur',
+      stdDeviation: [4, 0],
+  });
+  ctx.fillRect(25, 25, 50, 50);
+
+  const outputCanvas = document.getElementById("canvas");
+  outputCanvas.getContext('2d').drawImage(canvas, 0, 0);
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.x-only.tentative.w.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.x-only.tentative.w.html
new file mode 100644
index 0000000000..35cbc1b365
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.x-only.tentative.w.html
@@ -0,0 +1,37 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<html class="reftest-wait">
+<link rel="match" href="2d.filter.canvasFilterObject.gaussianBlur.x-only.tentative-expected.html">
+<title>Canvas test: 2d.filter.canvasFilterObject.gaussianBlur.x-only.tentative</title>
+<h1>2d.filter.canvasFilterObject.gaussianBlur.x-only.tentative</h1>
+<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script id='myWorker' type='text/worker'>
+  self.onmessage = function(e) {
+    const canvas = new OffscreenCanvas(100, 100);
+    const ctx = canvas.getContext('2d');
+
+    ctx.fillStyle = 'teal';
+    ctx.filter = new CanvasFilter({
+        name: 'gaussianBlur',
+        stdDeviation: [4, 0],
+    });
+    ctx.fillRect(25, 25, 50, 50);
+
+    const bitmap = canvas.transferToImageBitmap();
+    self.postMessage(bitmap, bitmap);
+  };
+</script>
+<script>
+  const blob = new Blob([document.getElementById('myWorker').textContent]);
+  const worker = new Worker(URL.createObjectURL(blob));
+  worker.addEventListener('message', msg => {
+    const outputCtx = document.getElementById("canvas").getContext('2d');
+    outputCtx.drawImage(msg.data, 0, 0);
+    document.documentElement.classList.remove("reftest-wait");
+  });
+  worker.postMessage(null);
+</script>
+</html>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.y-only.tentative-expected.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.y-only.tentative-expected.html
new file mode 100644
index 0000000000..c6d915cb07
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.y-only.tentative-expected.html
@@ -0,0 +1,15 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>Canvas test: 2d.filter.canvasFilterObject.gaussianBlur.y-only.tentative</title>
+<h1>2d.filter.canvasFilterObject.gaussianBlur.y-only.tentative</h1>
+<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
+
+<svg xmlns="http://www.w3.org/2000/svg"
+     width="100" height="100"
+     color-interpolation-filters="sRGB">
+  <filter id="blur" x="-50%" y="-50%" width="200%" height="200%">
+    <feGaussianBlur stdDeviation="0 4" />
+  </filter>
+  <rect x="25" y="25" width="50" height="50"
+        fill="teal" filter="url(#blur)" />
+</svg>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.y-only.tentative.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.y-only.tentative.html
new file mode 100644
index 0000000000..f563ad9d77
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.y-only.tentative.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<link rel="match" href="2d.filter.canvasFilterObject.gaussianBlur.y-only.tentative-expected.html">
+<title>Canvas test: 2d.filter.canvasFilterObject.gaussianBlur.y-only.tentative</title>
+<h1>2d.filter.canvasFilterObject.gaussianBlur.y-only.tentative</h1>
+<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = new OffscreenCanvas(100, 100);
+  const ctx = canvas.getContext('2d');
+
+  ctx.fillStyle = 'teal';
+  ctx.filter = new CanvasFilter({
+      name: 'gaussianBlur',
+      stdDeviation: [0, 4],
+  });
+  ctx.fillRect(25, 25, 50, 50);
+
+  const outputCanvas = document.getElementById("canvas");
+  outputCanvas.getContext('2d').drawImage(canvas, 0, 0);
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.y-only.tentative.w.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.y-only.tentative.w.html
new file mode 100644
index 0000000000..171a41caa8
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.gaussianBlur.y-only.tentative.w.html
@@ -0,0 +1,37 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<html class="reftest-wait">
+<link rel="match" href="2d.filter.canvasFilterObject.gaussianBlur.y-only.tentative-expected.html">
+<title>Canvas test: 2d.filter.canvasFilterObject.gaussianBlur.y-only.tentative</title>
+<h1>2d.filter.canvasFilterObject.gaussianBlur.y-only.tentative</h1>
+<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script id='myWorker' type='text/worker'>
+  self.onmessage = function(e) {
+    const canvas = new OffscreenCanvas(100, 100);
+    const ctx = canvas.getContext('2d');
+
+    ctx.fillStyle = 'teal';
+    ctx.filter = new CanvasFilter({
+        name: 'gaussianBlur',
+        stdDeviation: [0, 4],
+    });
+    ctx.fillRect(25, 25, 50, 50);
+
+    const bitmap = canvas.transferToImageBitmap();
+    self.postMessage(bitmap, bitmap);
+  };
+</script>
+<script>
+  const blob = new Blob([document.getElementById('myWorker').textContent]);
+  const worker = new Worker(URL.createObjectURL(blob));
+  worker.addEventListener('message', msg => {
+    const outputCtx = document.getElementById("canvas").getContext('2d');
+    outputCtx.drawImage(msg.data, 0, 0);
+    document.documentElement.classList.remove("reftest-wait");
+  });
+  worker.postMessage(null);
+</script>
+</html>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.turbulence.inputTypes.tentative.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.turbulence.inputTypes.tentative.html
index 040c62a96b..8ad2a5ccfb 100644
--- a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.turbulence.inputTypes.tentative.html
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.turbulence.inputTypes.tentative.html
@@ -117,12 +117,12 @@ t.step(function() {
 
   for (testCase of errorTestCases) {
     const filterOptions = {...{name: 'turbulence'}, ...testCase};
-    assert_throws_js(TypeError, function() { new CanvasFilter(filterOptions); });
+    assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(filterOptions); });
   }
 
   for (testCase of workingTestCases) {
     const filterOptions = {...{name: 'turbulence'}, ...testCase};
-    _assert(new CanvasFilter(filterOptions) != null, "new CanvasFilter(filterOptions) != null");
+    ctx.filter = new CanvasFilter(filterOptions);
   }
   t.done();
 
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.turbulence.inputTypes.tentative.worker.js b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.turbulence.inputTypes.tentative.worker.js
index 1a950a9207..16199cb0ec 100644
--- a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.turbulence.inputTypes.tentative.worker.js
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.canvasFilterObject.turbulence.inputTypes.tentative.worker.js
@@ -113,12 +113,12 @@ t.step(function() {
 
   for (testCase of errorTestCases) {
     const filterOptions = {...{name: 'turbulence'}, ...testCase};
-    assert_throws_js(TypeError, function() { new CanvasFilter(filterOptions); });
+    assert_throws_js(TypeError, function() { ctx.filter = new CanvasFilter(filterOptions); });
   }
 
   for (testCase of workingTestCases) {
     const filterOptions = {...{name: 'turbulence'}, ...testCase};
-    _assert(new CanvasFilter(filterOptions) != null, "new CanvasFilter(filterOptions) != null");
+    ctx.filter = new CanvasFilter(filterOptions);
   }
   t.done();
 });
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.blur.exceptions.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.blur.exceptions.html
new file mode 100644
index 0000000000..36dd856456
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.blur.exceptions.html
@@ -0,0 +1,38 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>OffscreenCanvas test: 2d.filter.layers.blur.exceptions</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+
+<h1>2d.filter.layers.blur.exceptions</h1>
+<p class="desc">Test exceptions on gaussianBlur filter</p>
+
+
+<script>
+var t = async_test("Test exceptions on gaussianBlur filter");
+var t_pass = t.done.bind(t);
+var t_fail = t.step_func(function(reason) {
+    throw reason;
+});
+t.step(function() {
+
+  var canvas = new OffscreenCanvas(100, 50);
+  var ctx = canvas.getContext('2d');
+
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'gaussianBlur'}}); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'gaussianBlur', stdDeviation: undefined}}); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'gaussianBlur', stdDeviation: 'foo'}}); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'gaussianBlur', stdDeviation: [1,2,3]}}); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'gaussianBlur', stdDeviation: NaN}}); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'gaussianBlur', stdDeviation: {}}}); });
+  t.done();
+
+});
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.blur.exceptions.worker.js b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.blur.exceptions.worker.js
new file mode 100644
index 0000000000..a053b8113c
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.blur.exceptions.worker.js
@@ -0,0 +1,33 @@
+// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
+// OffscreenCanvas test in a worker:2d.filter.layers.blur.exceptions
+// Description:Test exceptions on gaussianBlur filter
+// Note:
+
+importScripts("/resources/testharness.js");
+importScripts("/html/canvas/resources/canvas-tests.js");
+
+var t = async_test("Test exceptions on gaussianBlur filter");
+var t_pass = t.done.bind(t);
+var t_fail = t.step_func(function(reason) {
+    throw reason;
+});
+t.step(function() {
+
+  var canvas = new OffscreenCanvas(100, 50);
+  var ctx = canvas.getContext('2d');
+
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'gaussianBlur'}}); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'gaussianBlur', stdDeviation: undefined}}); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'gaussianBlur', stdDeviation: 'foo'}}); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'gaussianBlur', stdDeviation: [1,2,3]}}); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'gaussianBlur', stdDeviation: NaN}}); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'gaussianBlur', stdDeviation: {}}}); });
+  t.done();
+});
+done();
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.colorMatrix.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.colorMatrix.html
new file mode 100644
index 0000000000..9e12acbbe0
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.colorMatrix.html
@@ -0,0 +1,105 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>OffscreenCanvas test: 2d.filter.layers.colorMatrix</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+
+<h1>2d.filter.layers.colorMatrix</h1>
+<p class="desc">Test the functionality of ColorMatrix filters</p>
+
+
+<script>
+var t = async_test("Test the functionality of ColorMatrix filters");
+var t_pass = t.done.bind(t);
+var t_fail = t.step_func(function(reason) {
+    throw reason;
+});
+t.step(function() {
+
+  var canvas = new OffscreenCanvas(100, 50);
+  var ctx = canvas.getContext('2d');
+
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'colorMatrix', values: undefined}}); });
+
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'colorMatrix', values: 'foo'}}); });
+
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'colorMatrix', values: null}}); });
+
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'colorMatrix', values: [1, 2, 3]}}); });
+
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'colorMatrix',
+     values: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18,
+              19, 'a']}}); });
+
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'colorMatrix',
+     values: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18,
+              19, Infinity]}}); });
+
+  ctx.fillStyle = '#f00';
+  ctx.beginLayer({filter:
+    {name: 'colorMatrix', type: 'hueRotate', values: 0}});
+  ctx.fillRect(0, 0, 100, 50);
+  ctx.endLayer();
+  _assertPixelApprox(canvas, 10,10, 255,0,0,255, 2);
+
+  ctx.beginLayer({filter:
+    {name: 'colorMatrix', type: 'hueRotate', values: 90}});
+  ctx.fillRect(0, 0, 100, 50);
+  ctx.endLayer();
+  _assertPixelApprox(canvas, 10,10, 0,91,0,255, 2);
+
+  ctx.beginLayer({filter:
+    {name: 'colorMatrix', type: 'hueRotate', values: 180}});
+  ctx.fillRect(0, 0, 100, 50);
+  ctx.endLayer();
+  _assertPixelApprox(canvas, 10,10, 0,109,109,255, 2);
+
+  ctx.beginLayer({filter:
+    {name: 'colorMatrix', type: 'hueRotate', values: 270}});
+  ctx.fillRect(0, 0, 100, 50);
+  ctx.endLayer();
+  _assertPixelApprox(canvas, 10,10, 109,18,255,255, 2);
+
+  ctx.beginLayer({filter:
+    {name: 'colorMatrix', type: 'saturate', values: 0.5}});
+  ctx.fillRect(0, 0, 100, 50);
+  ctx.endLayer();
+  _assertPixelApprox(canvas, 10,10, 155,27,27,255, 2);
+
+  ctx.clearRect(0, 0, 100, 50);
+  ctx.beginLayer({filter:
+    {name: 'colorMatrix', type: 'luminanceToAlpha'}});
+  ctx.fillRect(0, 0, 100, 50);
+  ctx.endLayer();
+  _assertPixelApprox(canvas, 10,10, 0,0,0,54, 2);
+
+  ctx.beginLayer({filter:
+    {name: 'colorMatrix', values: [
+      0, 0, 0, 0, 0,
+      1, 1, 1, 1, 0,
+      0, 0, 0, 0, 0,
+      0, 0, 0, 1, 0
+    ]}});
+  ctx.fillRect(0, 0, 50, 25);
+  ctx.fillStyle = '#0f0';
+  ctx.fillRect(50, 0, 50, 25);
+  ctx.fillStyle = '#00f';
+  ctx.fillRect(0, 25, 50, 25);
+  ctx.fillStyle = '#fff';
+  ctx.fillRect(50, 25, 50, 25);
+  ctx.endLayer();
+  _assertPixelApprox(canvas, 10,10, 0,255,0,255, 2);
+  _assertPixelApprox(canvas, 60,10, 0,255,0,255, 2);
+  _assertPixelApprox(canvas, 10,30, 0,255,0,255, 2);
+  _assertPixelApprox(canvas, 60,30, 0,255,0,255, 2);
+  t.done();
+
+});
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.colorMatrix.worker.js b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.colorMatrix.worker.js
new file mode 100644
index 0000000000..12cdff3868
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.colorMatrix.worker.js
@@ -0,0 +1,100 @@
+// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
+// OffscreenCanvas test in a worker:2d.filter.layers.colorMatrix
+// Description:Test the functionality of ColorMatrix filters
+// Note:
+
+importScripts("/resources/testharness.js");
+importScripts("/html/canvas/resources/canvas-tests.js");
+
+var t = async_test("Test the functionality of ColorMatrix filters");
+var t_pass = t.done.bind(t);
+var t_fail = t.step_func(function(reason) {
+    throw reason;
+});
+t.step(function() {
+
+  var canvas = new OffscreenCanvas(100, 50);
+  var ctx = canvas.getContext('2d');
+
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'colorMatrix', values: undefined}}); });
+
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'colorMatrix', values: 'foo'}}); });
+
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'colorMatrix', values: null}}); });
+
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'colorMatrix', values: [1, 2, 3]}}); });
+
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'colorMatrix',
+     values: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18,
+              19, 'a']}}); });
+
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'colorMatrix',
+     values: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18,
+              19, Infinity]}}); });
+
+  ctx.fillStyle = '#f00';
+  ctx.beginLayer({filter:
+    {name: 'colorMatrix', type: 'hueRotate', values: 0}});
+  ctx.fillRect(0, 0, 100, 50);
+  ctx.endLayer();
+  _assertPixelApprox(canvas, 10,10, 255,0,0,255, 2);
+
+  ctx.beginLayer({filter:
+    {name: 'colorMatrix', type: 'hueRotate', values: 90}});
+  ctx.fillRect(0, 0, 100, 50);
+  ctx.endLayer();
+  _assertPixelApprox(canvas, 10,10, 0,91,0,255, 2);
+
+  ctx.beginLayer({filter:
+    {name: 'colorMatrix', type: 'hueRotate', values: 180}});
+  ctx.fillRect(0, 0, 100, 50);
+  ctx.endLayer();
+  _assertPixelApprox(canvas, 10,10, 0,109,109,255, 2);
+
+  ctx.beginLayer({filter:
+    {name: 'colorMatrix', type: 'hueRotate', values: 270}});
+  ctx.fillRect(0, 0, 100, 50);
+  ctx.endLayer();
+  _assertPixelApprox(canvas, 10,10, 109,18,255,255, 2);
+
+  ctx.beginLayer({filter:
+    {name: 'colorMatrix', type: 'saturate', values: 0.5}});
+  ctx.fillRect(0, 0, 100, 50);
+  ctx.endLayer();
+  _assertPixelApprox(canvas, 10,10, 155,27,27,255, 2);
+
+  ctx.clearRect(0, 0, 100, 50);
+  ctx.beginLayer({filter:
+    {name: 'colorMatrix', type: 'luminanceToAlpha'}});
+  ctx.fillRect(0, 0, 100, 50);
+  ctx.endLayer();
+  _assertPixelApprox(canvas, 10,10, 0,0,0,54, 2);
+
+  ctx.beginLayer({filter:
+    {name: 'colorMatrix', values: [
+      0, 0, 0, 0, 0,
+      1, 1, 1, 1, 0,
+      0, 0, 0, 0, 0,
+      0, 0, 0, 1, 0
+    ]}});
+  ctx.fillRect(0, 0, 50, 25);
+  ctx.fillStyle = '#0f0';
+  ctx.fillRect(50, 0, 50, 25);
+  ctx.fillStyle = '#00f';
+  ctx.fillRect(0, 25, 50, 25);
+  ctx.fillStyle = '#fff';
+  ctx.fillRect(50, 25, 50, 25);
+  ctx.endLayer();
+  _assertPixelApprox(canvas, 10,10, 0,255,0,255, 2);
+  _assertPixelApprox(canvas, 60,10, 0,255,0,255, 2);
+  _assertPixelApprox(canvas, 10,30, 0,255,0,255, 2);
+  _assertPixelApprox(canvas, 60,30, 0,255,0,255, 2);
+  t.done();
+});
+done();
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.componentTransfer.discrete-expected.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.componentTransfer.discrete-expected.html
new file mode 100644
index 0000000000..8419953b3d
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.componentTransfer.discrete-expected.html
@@ -0,0 +1,50 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>Canvas test: 2d.filter.layers.componentTransfer.discrete</title>
+<h1>2d.filter.layers.componentTransfer.discrete</h1>
+<p class="desc">Test pixels on CanvasFilter() componentTransfer with discrete type</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = document.getElementById("canvas");
+  const ctx = canvas.getContext('2d');
+
+  // From https://www.w3.org/TR/SVG11/filters.html#feComponentTransferElement
+  function getTransformedValue(C, V) {
+      // Get the right interval
+      const n = V.length;
+      const k = C == 1 ? n - 1 : Math.floor(C * n);
+      return V[k];
+  }
+
+  function getColor(inputColor, tableValues) {
+      const result = [0, 0, 0];
+      for (const i in inputColor) {
+          const C = inputColor[i]/255;
+          const Cprime = getTransformedValue(C, tableValues[i]);
+          result[i] = Math.max(0, Math.min(1, Cprime)) * 255;
+      }
+      return result;
+  }
+
+  tableValuesR = [0, 0, 1, 1];
+  tableValuesG = [2, 0, 0.5, 3];
+  tableValuesB = [1, -1, 5, 0];
+
+  const inputColors = [
+      [255, 255, 255],
+      [0, 0, 0],
+      [127, 0, 34],
+      [252, 186, 3],
+      [50, 68, 87],
+  ];
+  for (let i = 0 ; i < inputColors.length ; ++i) {
+      const color = inputColors[i];
+      let outputColor = getColor(
+          color, [tableValuesR, tableValuesG, tableValuesB]);
+      ctx.fillStyle = `rgb(${outputColor[0]}, ${outputColor[1]},
+        ${outputColor[2]})`;
+      ctx.fillRect(i * 10, i * 10, 10, 10);
+  }
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.componentTransfer.discrete.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.componentTransfer.discrete.html
new file mode 100644
index 0000000000..459c2f2850
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.componentTransfer.discrete.html
@@ -0,0 +1,41 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<link rel="match" href="2d.filter.layers.componentTransfer.discrete-expected.html">
+<meta name=fuzzy content="maxDifference=0-2; totalPixels=0-500">
+<title>Canvas test: 2d.filter.layers.componentTransfer.discrete</title>
+<h1>2d.filter.layers.componentTransfer.discrete</h1>
+<p class="desc">Test pixels on CanvasFilter() componentTransfer with discrete type</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = new OffscreenCanvas(100, 100);
+  const ctx = canvas.getContext('2d');
+
+  tableValuesR = [0, 0, 1, 1];
+  tableValuesG = [2, 0, 0.5, 3];
+  tableValuesB = [1, -1, 5, 0];
+  ctx.beginLayer({filter: {name: 'componentTransfer',
+      funcR: {type: 'discrete', tableValues: tableValuesR},
+      funcG: {type: 'discrete', tableValues: tableValuesG},
+      funcB: {type: 'discrete', tableValues: tableValuesB},
+  }});
+
+  const inputColors = [
+      [255, 255, 255],
+      [0, 0, 0],
+      [127, 0, 34],
+      [252, 186, 3],
+      [50, 68, 87],
+  ];
+
+  for (let i = 0 ; i < inputColors.length ; ++i) {
+      const color = inputColors[i];
+      ctx.fillStyle = `rgb(${color[0]}, ${color[1]}, ${color[2]})`;
+      ctx.fillRect(i * 10, i * 10, 10, 10);
+  }
+  ctx.endLayer();
+
+  const outputCanvas = document.getElementById("canvas");
+  outputCanvas.getContext('2d').drawImage(canvas, 0, 0);
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.componentTransfer.discrete.w.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.componentTransfer.discrete.w.html
new file mode 100644
index 0000000000..86e1d54fb7
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.componentTransfer.discrete.w.html
@@ -0,0 +1,55 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<html class="reftest-wait">
+<link rel="match" href="2d.filter.layers.componentTransfer.discrete-expected.html">
+<meta name=fuzzy content="maxDifference=0-2; totalPixels=0-500">
+<title>Canvas test: 2d.filter.layers.componentTransfer.discrete</title>
+<h1>2d.filter.layers.componentTransfer.discrete</h1>
+<p class="desc">Test pixels on CanvasFilter() componentTransfer with discrete type</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script id='myWorker' type='text/worker'>
+  self.onmessage = function(e) {
+    const canvas = new OffscreenCanvas(100, 100);
+    const ctx = canvas.getContext('2d');
+
+    tableValuesR = [0, 0, 1, 1];
+    tableValuesG = [2, 0, 0.5, 3];
+    tableValuesB = [1, -1, 5, 0];
+    ctx.beginLayer({filter: {name: 'componentTransfer',
+        funcR: {type: 'discrete', tableValues: tableValuesR},
+        funcG: {type: 'discrete', tableValues: tableValuesG},
+        funcB: {type: 'discrete', tableValues: tableValuesB},
+    }});
+
+    const inputColors = [
+        [255, 255, 255],
+        [0, 0, 0],
+        [127, 0, 34],
+        [252, 186, 3],
+        [50, 68, 87],
+    ];
+
+    for (let i = 0 ; i < inputColors.length ; ++i) {
+        const color = inputColors[i];
+        ctx.fillStyle = `rgb(${color[0]}, ${color[1]}, ${color[2]})`;
+        ctx.fillRect(i * 10, i * 10, 10, 10);
+    }
+    ctx.endLayer();
+
+    const bitmap = canvas.transferToImageBitmap();
+    self.postMessage(bitmap, bitmap);
+  };
+</script>
+<script>
+  const blob = new Blob([document.getElementById('myWorker').textContent]);
+  const worker = new Worker(URL.createObjectURL(blob));
+  worker.addEventListener('message', msg => {
+    const outputCtx = document.getElementById("canvas").getContext('2d');
+    outputCtx.drawImage(msg.data, 0, 0);
+    document.documentElement.classList.remove("reftest-wait");
+  });
+  worker.postMessage(null);
+</script>
+</html>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.componentTransfer.gamma-expected.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.componentTransfer.gamma-expected.html
new file mode 100644
index 0000000000..3e5d980896
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.componentTransfer.gamma-expected.html
@@ -0,0 +1,44 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>Canvas test: 2d.filter.layers.componentTransfer.gamma</title>
+<h1>2d.filter.layers.componentTransfer.gamma</h1>
+<p class="desc">Test pixels on CanvasFilter() componentTransfer with gamma type</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = document.getElementById("canvas");
+  const ctx = canvas.getContext('2d');
+
+  // From https://www.w3.org/TR/SVG11/filters.html#feComponentTransferElement
+  function getColor(inputColor, amplitude, exponent, offset) {
+      return [
+          Math.max(0, Math.min(1, Math.pow(inputColor[0]/255,
+            exponent[0]) * amplitude[0] + offset[0])) * 255,
+          Math.max(0, Math.min(1, Math.pow(inputColor[1]/255,
+            exponent[1]) * amplitude[1] + offset[1])) * 255,
+          Math.max(0, Math.min(1, Math.pow(inputColor[2]/255,
+            exponent[2]) * amplitude[2] + offset[2])) * 255,
+      ];
+  }
+
+  const amplitudes = [2, 1.1, 0.5];
+  const exponents = [5, 3, 1];
+  const offsets = [0.25, 0, 0.5];
+
+  const inputColors = [
+      [255, 255, 255],
+      [0, 0, 0],
+      [127, 0, 34],
+      [252, 186, 3],
+      [50, 68, 87],
+  ];
+
+  for (let i = 0 ; i < inputColors.length ; ++i) {
+      const color = inputColors[i];
+      let outputColor = getColor(color, amplitudes, exponents, offsets);
+      ctx.fillStyle = `rgb(${outputColor[0]}, ${outputColor[1]},
+        ${outputColor[2]})`;
+      ctx.fillRect(i * 10, i * 10, 10, 10);
+  }
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.componentTransfer.gamma.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.componentTransfer.gamma.html
new file mode 100644
index 0000000000..9012115adf
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.componentTransfer.gamma.html
@@ -0,0 +1,44 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<link rel="match" href="2d.filter.layers.componentTransfer.gamma-expected.html">
+<meta name=fuzzy content="maxDifference=0-2; totalPixels=0-500">
+<title>Canvas test: 2d.filter.layers.componentTransfer.gamma</title>
+<h1>2d.filter.layers.componentTransfer.gamma</h1>
+<p class="desc">Test pixels on CanvasFilter() componentTransfer with gamma type</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = new OffscreenCanvas(100, 100);
+  const ctx = canvas.getContext('2d');
+
+  const amplitudes = [2, 1.1, 0.5];
+  const exponents = [5, 3, 1];
+  const offsets = [0.25, 0, 0.5];
+  ctx.beginLayer({filter: {name: 'componentTransfer',
+      funcR: {type: 'gamma', amplitude: amplitudes[0],
+        exponent: exponents[0], offset: offsets[0]},
+      funcG: {type: 'gamma', amplitude: amplitudes[1],
+        exponent: exponents[1], offset: offsets[1]},
+      funcB: {type: 'gamma', amplitude: amplitudes[2],
+        exponent: exponents[2], offset: offsets[2]},
+  }});
+
+  const inputColors = [
+      [255, 255, 255],
+      [0, 0, 0],
+      [127, 0, 34],
+      [252, 186, 3],
+      [50, 68, 87],
+  ];
+
+  for (let i = 0 ; i < inputColors.length ; ++i) {
+      const color = inputColors[i];
+      ctx.fillStyle = `rgb(${color[0]}, ${color[1]}, ${color[2]})`;
+      ctx.fillRect(i * 10, i * 10, 10, 10);
+  }
+  ctx.endLayer();
+
+  const outputCanvas = document.getElementById("canvas");
+  outputCanvas.getContext('2d').drawImage(canvas, 0, 0);
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.componentTransfer.gamma.w.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.componentTransfer.gamma.w.html
new file mode 100644
index 0000000000..767bcc58e5
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.componentTransfer.gamma.w.html
@@ -0,0 +1,58 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<html class="reftest-wait">
+<link rel="match" href="2d.filter.layers.componentTransfer.gamma-expected.html">
+<meta name=fuzzy content="maxDifference=0-2; totalPixels=0-500">
+<title>Canvas test: 2d.filter.layers.componentTransfer.gamma</title>
+<h1>2d.filter.layers.componentTransfer.gamma</h1>
+<p class="desc">Test pixels on CanvasFilter() componentTransfer with gamma type</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script id='myWorker' type='text/worker'>
+  self.onmessage = function(e) {
+    const canvas = new OffscreenCanvas(100, 100);
+    const ctx = canvas.getContext('2d');
+
+    const amplitudes = [2, 1.1, 0.5];
+    const exponents = [5, 3, 1];
+    const offsets = [0.25, 0, 0.5];
+    ctx.beginLayer({filter: {name: 'componentTransfer',
+        funcR: {type: 'gamma', amplitude: amplitudes[0],
+          exponent: exponents[0], offset: offsets[0]},
+        funcG: {type: 'gamma', amplitude: amplitudes[1],
+          exponent: exponents[1], offset: offsets[1]},
+        funcB: {type: 'gamma', amplitude: amplitudes[2],
+          exponent: exponents[2], offset: offsets[2]},
+    }});
+
+    const inputColors = [
+        [255, 255, 255],
+        [0, 0, 0],
+        [127, 0, 34],
+        [252, 186, 3],
+        [50, 68, 87],
+    ];
+
+    for (let i = 0 ; i < inputColors.length ; ++i) {
+        const color = inputColors[i];
+        ctx.fillStyle = `rgb(${color[0]}, ${color[1]}, ${color[2]})`;
+        ctx.fillRect(i * 10, i * 10, 10, 10);
+    }
+    ctx.endLayer();
+
+    const bitmap = canvas.transferToImageBitmap();
+    self.postMessage(bitmap, bitmap);
+  };
+</script>
+<script>
+  const blob = new Blob([document.getElementById('myWorker').textContent]);
+  const worker = new Worker(URL.createObjectURL(blob));
+  worker.addEventListener('message', msg => {
+    const outputCtx = document.getElementById("canvas").getContext('2d');
+    outputCtx.drawImage(msg.data, 0, 0);
+    document.documentElement.classList.remove("reftest-wait");
+  });
+  worker.postMessage(null);
+</script>
+</html>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.componentTransfer.identity-expected.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.componentTransfer.identity-expected.html
new file mode 100644
index 0000000000..9f1439f37b
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.componentTransfer.identity-expected.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>Canvas test: 2d.filter.layers.componentTransfer.identity</title>
+<h1>2d.filter.layers.componentTransfer.identity</h1>
+<p class="desc">Test pixels on CanvasFilter() componentTransfer with identity type</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = document.getElementById("canvas");
+  const ctx = canvas.getContext('2d');
+
+  const inputColors = [
+      [255, 255, 255],
+      [0, 0, 0],
+      [127, 0, 34],
+      [252, 186, 3],
+      [50, 68, 87],
+  ];
+
+  for (let i = 0 ; i < inputColors.length ; ++i) {
+      let outputColor = inputColors[i];
+      ctx.fillStyle = `rgb(${outputColor[0]}, ${outputColor[1]},
+        ${outputColor[2]})`;
+      ctx.fillRect(i * 10, i * 10, 10, 10);
+  }
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.componentTransfer.identity.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.componentTransfer.identity.html
new file mode 100644
index 0000000000..901dae3bed
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.componentTransfer.identity.html
@@ -0,0 +1,37 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<link rel="match" href="2d.filter.layers.componentTransfer.identity-expected.html">
+<title>Canvas test: 2d.filter.layers.componentTransfer.identity</title>
+<h1>2d.filter.layers.componentTransfer.identity</h1>
+<p class="desc">Test pixels on CanvasFilter() componentTransfer with identity type</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = new OffscreenCanvas(100, 100);
+  const ctx = canvas.getContext('2d');
+
+  ctx.beginLayer({filter: {name: 'componentTransfer',
+      funcR: {type: 'identity'},
+      funcG: {type: 'identity'},
+      funcB: {type: 'identity'},
+  }});
+
+  const inputColors = [
+      [255, 255, 255],
+      [0, 0, 0],
+      [127, 0, 34],
+      [252, 186, 3],
+      [50, 68, 87],
+  ];
+
+  for (let i = 0 ; i < inputColors.length ; ++i) {
+      const color = inputColors[i];
+      ctx.fillStyle = `rgb(${color[0]}, ${color[1]}, ${color[2]})`;
+      ctx.fillRect(i * 10, i * 10, 10, 10);
+  }
+  ctx.endLayer();
+
+  const outputCanvas = document.getElementById("canvas");
+  outputCanvas.getContext('2d').drawImage(canvas, 0, 0);
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.componentTransfer.identity.w.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.componentTransfer.identity.w.html
new file mode 100644
index 0000000000..2e45018755
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.componentTransfer.identity.w.html
@@ -0,0 +1,51 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<html class="reftest-wait">
+<link rel="match" href="2d.filter.layers.componentTransfer.identity-expected.html">
+<title>Canvas test: 2d.filter.layers.componentTransfer.identity</title>
+<h1>2d.filter.layers.componentTransfer.identity</h1>
+<p class="desc">Test pixels on CanvasFilter() componentTransfer with identity type</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script id='myWorker' type='text/worker'>
+  self.onmessage = function(e) {
+    const canvas = new OffscreenCanvas(100, 100);
+    const ctx = canvas.getContext('2d');
+
+    ctx.beginLayer({filter: {name: 'componentTransfer',
+        funcR: {type: 'identity'},
+        funcG: {type: 'identity'},
+        funcB: {type: 'identity'},
+    }});
+
+    const inputColors = [
+        [255, 255, 255],
+        [0, 0, 0],
+        [127, 0, 34],
+        [252, 186, 3],
+        [50, 68, 87],
+    ];
+
+    for (let i = 0 ; i < inputColors.length ; ++i) {
+        const color = inputColors[i];
+        ctx.fillStyle = `rgb(${color[0]}, ${color[1]}, ${color[2]})`;
+        ctx.fillRect(i * 10, i * 10, 10, 10);
+    }
+    ctx.endLayer();
+
+    const bitmap = canvas.transferToImageBitmap();
+    self.postMessage(bitmap, bitmap);
+  };
+</script>
+<script>
+  const blob = new Blob([document.getElementById('myWorker').textContent]);
+  const worker = new Worker(URL.createObjectURL(blob));
+  worker.addEventListener('message', msg => {
+    const outputCtx = document.getElementById("canvas").getContext('2d');
+    outputCtx.drawImage(msg.data, 0, 0);
+    document.documentElement.classList.remove("reftest-wait");
+  });
+  worker.postMessage(null);
+</script>
+</html>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.componentTransfer.linear-expected.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.componentTransfer.linear-expected.html
new file mode 100644
index 0000000000..f922055ff2
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.componentTransfer.linear-expected.html
@@ -0,0 +1,44 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>Canvas test: 2d.filter.layers.componentTransfer.linear</title>
+<h1>2d.filter.layers.componentTransfer.linear</h1>
+<p class="desc">Test pixels on CanvasFilter() componentTransfer with linear type</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = document.getElementById("canvas");
+  const ctx = canvas.getContext('2d');
+
+  // From https://www.w3.org/TR/SVG11/filters.html#feComponentTransferElement
+  function getColor(inputColor, slopes, intercepts) {
+      return [
+          Math.max(0, Math.min(1,
+            inputColor[0]/255 * slopes[0] + intercepts[0])) * 255,
+          Math.max(0, Math.min(1,
+            inputColor[1]/255 * slopes[1] + intercepts[1])) * 255,
+          Math.max(0, Math.min(1,
+            inputColor[2]/255 * slopes[2] + intercepts[2])) * 255,
+      ];
+  }
+
+  const slopes = [0.5, 1.2, -0.2];
+  const intercepts = [0.25, 0, 0.5];
+
+  const inputColors = [
+      [255, 255, 255],
+      [0, 0, 0],
+      [127, 0, 34],
+      [252, 186, 3],
+      [50, 68, 87],
+  ];
+
+  for (let i = 0 ; i < inputColors.length ; ++i) {
+      const color = inputColors[i];
+      let outputColor = getColor(color, slopes, intercepts);
+      ctx.fillStyle = `rgb(${outputColor[0]}, ${outputColor[1]},
+        ${outputColor[2]})`;
+      ctx.fillRect(i * 10, i * 10, 10, 10);
+  }
+  ctx.endLayer();
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.componentTransfer.linear.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.componentTransfer.linear.html
new file mode 100644
index 0000000000..f418b72ad5
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.componentTransfer.linear.html
@@ -0,0 +1,40 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<link rel="match" href="2d.filter.layers.componentTransfer.linear-expected.html">
+<meta name=fuzzy content="maxDifference=0-2; totalPixels=0-500">
+<title>Canvas test: 2d.filter.layers.componentTransfer.linear</title>
+<h1>2d.filter.layers.componentTransfer.linear</h1>
+<p class="desc">Test pixels on CanvasFilter() componentTransfer with linear type</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = new OffscreenCanvas(100, 100);
+  const ctx = canvas.getContext('2d');
+
+  const slopes = [0.5, 1.2, -0.2];
+  const intercepts = [0.25, 0, 0.5];
+  ctx.beginLayer({filter: {name: 'componentTransfer',
+      funcR: {type: 'linear', slope: slopes[0], intercept: intercepts[0]},
+      funcG: {type: 'linear', slope: slopes[1], intercept: intercepts[1]},
+      funcB: {type: 'linear', slope: slopes[2], intercept: intercepts[2]},
+  }});
+
+  const inputColors = [
+      [255, 255, 255],
+      [0, 0, 0],
+      [127, 0, 34],
+      [252, 186, 3],
+      [50, 68, 87],
+  ];
+
+  for (let i = 0 ; i < inputColors.length ; ++i) {
+      const color = inputColors[i];
+      ctx.fillStyle = `rgb(${color[0]}, ${color[1]}, ${color[2]})`;
+      ctx.fillRect(i * 10, i * 10, 10, 10);
+  }
+  ctx.endLayer();
+
+  const outputCanvas = document.getElementById("canvas");
+  outputCanvas.getContext('2d').drawImage(canvas, 0, 0);
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.componentTransfer.linear.w.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.componentTransfer.linear.w.html
new file mode 100644
index 0000000000..fbc29c86c1
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.componentTransfer.linear.w.html
@@ -0,0 +1,54 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<html class="reftest-wait">
+<link rel="match" href="2d.filter.layers.componentTransfer.linear-expected.html">
+<meta name=fuzzy content="maxDifference=0-2; totalPixels=0-500">
+<title>Canvas test: 2d.filter.layers.componentTransfer.linear</title>
+<h1>2d.filter.layers.componentTransfer.linear</h1>
+<p class="desc">Test pixels on CanvasFilter() componentTransfer with linear type</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script id='myWorker' type='text/worker'>
+  self.onmessage = function(e) {
+    const canvas = new OffscreenCanvas(100, 100);
+    const ctx = canvas.getContext('2d');
+
+    const slopes = [0.5, 1.2, -0.2];
+    const intercepts = [0.25, 0, 0.5];
+    ctx.beginLayer({filter: {name: 'componentTransfer',
+        funcR: {type: 'linear', slope: slopes[0], intercept: intercepts[0]},
+        funcG: {type: 'linear', slope: slopes[1], intercept: intercepts[1]},
+        funcB: {type: 'linear', slope: slopes[2], intercept: intercepts[2]},
+    }});
+
+    const inputColors = [
+        [255, 255, 255],
+        [0, 0, 0],
+        [127, 0, 34],
+        [252, 186, 3],
+        [50, 68, 87],
+    ];
+
+    for (let i = 0 ; i < inputColors.length ; ++i) {
+        const color = inputColors[i];
+        ctx.fillStyle = `rgb(${color[0]}, ${color[1]}, ${color[2]})`;
+        ctx.fillRect(i * 10, i * 10, 10, 10);
+    }
+    ctx.endLayer();
+
+    const bitmap = canvas.transferToImageBitmap();
+    self.postMessage(bitmap, bitmap);
+  };
+</script>
+<script>
+  const blob = new Blob([document.getElementById('myWorker').textContent]);
+  const worker = new Worker(URL.createObjectURL(blob));
+  worker.addEventListener('message', msg => {
+    const outputCtx = document.getElementById("canvas").getContext('2d');
+    outputCtx.drawImage(msg.data, 0, 0);
+    document.documentElement.classList.remove("reftest-wait");
+  });
+  worker.postMessage(null);
+</script>
+</html>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.componentTransfer.table-expected.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.componentTransfer.table-expected.html
new file mode 100644
index 0000000000..0f6736d87d
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.componentTransfer.table-expected.html
@@ -0,0 +1,51 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>Canvas test: 2d.filter.layers.componentTransfer.table</title>
+<h1>2d.filter.layers.componentTransfer.table</h1>
+<p class="desc">Test pixels on CanvasFilter() componentTransfer with table type</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = document.getElementById("canvas");
+  const ctx = canvas.getContext('2d');
+
+  // From https://www.w3.org/TR/SVG11/filters.html#feComponentTransferElement
+  function getTransformedValue(C, V) {
+      // Get the right interval
+      const n = V.length - 1;
+      const k = C == 1 ? n - 1 : Math.floor(C * n);
+      return V[k] + (C - k/n) * n * (V[k + 1] - V[k]);
+  }
+
+  function getColor(inputColor, tableValues) {
+      const result = [0, 0, 0];
+      for (const i in inputColor) {
+          const C = inputColor[i]/255;
+          const Cprime = getTransformedValue(C, tableValues[i]);
+          result[i] = Math.max(0, Math.min(1, Cprime)) * 255;
+      }
+      return result;
+  }
+
+  tableValuesR = [0, 0, 1, 1];
+  tableValuesG = [2, 0, 0.5, 3];
+  tableValuesB = [1, -1, 5, 0];
+
+  const inputColors = [
+      [255, 255, 255],
+      [0, 0, 0],
+      [127, 0, 34],
+      [252, 186, 3],
+      [50, 68, 87],
+  ];
+
+  for (let i = 0 ; i < inputColors.length ; ++i) {
+      const color = inputColors[i];
+      let outputColor = getColor(
+          color, [tableValuesR, tableValuesG, tableValuesB]);
+      ctx.fillStyle = `rgb(${outputColor[0]}, ${outputColor[1]},
+        ${outputColor[2]})`;
+      ctx.fillRect(i * 10, i * 10, 10, 10);
+  }
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.componentTransfer.table.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.componentTransfer.table.html
new file mode 100644
index 0000000000..ef5e0f847b
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.componentTransfer.table.html
@@ -0,0 +1,41 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<link rel="match" href="2d.filter.layers.componentTransfer.table-expected.html">
+<meta name=fuzzy content="maxDifference=0-2; totalPixels=0-500">
+<title>Canvas test: 2d.filter.layers.componentTransfer.table</title>
+<h1>2d.filter.layers.componentTransfer.table</h1>
+<p class="desc">Test pixels on CanvasFilter() componentTransfer with table type</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = new OffscreenCanvas(100, 100);
+  const ctx = canvas.getContext('2d');
+
+  tableValuesR = [0, 0, 1, 1];
+  tableValuesG = [2, 0, 0.5, 3];
+  tableValuesB = [1, -1, 5, 0];
+  ctx.beginLayer({filter: {name: 'componentTransfer',
+      funcR: {type: 'table', tableValues: tableValuesR},
+      funcG: {type: 'table', tableValues: tableValuesG},
+      funcB: {type: 'table', tableValues: tableValuesB},
+  }});
+
+  const inputColors = [
+      [255, 255, 255],
+      [0, 0, 0],
+      [127, 0, 34],
+      [252, 186, 3],
+      [50, 68, 87],
+  ];
+
+  for (let i = 0 ; i < inputColors.length ; ++i) {
+      const color = inputColors[i];
+      ctx.fillStyle = `rgb(${color[0]}, ${color[1]}, ${color[2]})`;
+      ctx.fillRect(i * 10, i * 10, 10, 10);
+  }
+  ctx.endLayer();
+
+  const outputCanvas = document.getElementById("canvas");
+  outputCanvas.getContext('2d').drawImage(canvas, 0, 0);
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.componentTransfer.table.w.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.componentTransfer.table.w.html
new file mode 100644
index 0000000000..b11f0ef6f3
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.componentTransfer.table.w.html
@@ -0,0 +1,55 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<html class="reftest-wait">
+<link rel="match" href="2d.filter.layers.componentTransfer.table-expected.html">
+<meta name=fuzzy content="maxDifference=0-2; totalPixels=0-500">
+<title>Canvas test: 2d.filter.layers.componentTransfer.table</title>
+<h1>2d.filter.layers.componentTransfer.table</h1>
+<p class="desc">Test pixels on CanvasFilter() componentTransfer with table type</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script id='myWorker' type='text/worker'>
+  self.onmessage = function(e) {
+    const canvas = new OffscreenCanvas(100, 100);
+    const ctx = canvas.getContext('2d');
+
+    tableValuesR = [0, 0, 1, 1];
+    tableValuesG = [2, 0, 0.5, 3];
+    tableValuesB = [1, -1, 5, 0];
+    ctx.beginLayer({filter: {name: 'componentTransfer',
+        funcR: {type: 'table', tableValues: tableValuesR},
+        funcG: {type: 'table', tableValues: tableValuesG},
+        funcB: {type: 'table', tableValues: tableValuesB},
+    }});
+
+    const inputColors = [
+        [255, 255, 255],
+        [0, 0, 0],
+        [127, 0, 34],
+        [252, 186, 3],
+        [50, 68, 87],
+    ];
+
+    for (let i = 0 ; i < inputColors.length ; ++i) {
+        const color = inputColors[i];
+        ctx.fillStyle = `rgb(${color[0]}, ${color[1]}, ${color[2]})`;
+        ctx.fillRect(i * 10, i * 10, 10, 10);
+    }
+    ctx.endLayer();
+
+    const bitmap = canvas.transferToImageBitmap();
+    self.postMessage(bitmap, bitmap);
+  };
+</script>
+<script>
+  const blob = new Blob([document.getElementById('myWorker').textContent]);
+  const worker = new Worker(URL.createObjectURL(blob));
+  worker.addEventListener('message', msg => {
+    const outputCtx = document.getElementById("canvas").getContext('2d');
+    outputCtx.drawImage(msg.data, 0, 0);
+    document.documentElement.classList.remove("reftest-wait");
+  });
+  worker.postMessage(null);
+</script>
+</html>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.convolveMatrix.exceptions.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.convolveMatrix.exceptions.html
new file mode 100644
index 0000000000..798822f104
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.convolveMatrix.exceptions.html
@@ -0,0 +1,61 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>OffscreenCanvas test: 2d.filter.layers.convolveMatrix.exceptions</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+
+<h1>2d.filter.layers.convolveMatrix.exceptions</h1>
+<p class="desc">Test exceptions on CanvasFilter() convolveMatrix</p>
+
+
+<script>
+var t = async_test("Test exceptions on CanvasFilter() convolveMatrix");
+var t_pass = t.done.bind(t);
+var t_fail = t.step_func(function(reason) {
+    throw reason;
+});
+t.step(function() {
+
+  var canvas = new OffscreenCanvas(100, 50);
+  var ctx = canvas.getContext('2d');
+
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'convolveMatrix'}}); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'convolveMatrix', divisor: 2}}); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'convolveMatrix', kernelMatrix: null}}); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'convolveMatrix', kernelMatrix: 1}}); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'convolveMatrix', kernelMatrix: [[1, 0], [0]]}}); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'convolveMatrix', kernelMatrix: [[1, 'a'], [0]]}}); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'convolveMatrix', kernelMatrix: [[1, 0], 0]}}); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'convolveMatrix', kernelMatrix: [[1, 0], [0, Infinity]]}}); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'convolveMatrix', kernelMatrix: []}}); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'convolveMatrix', kernelMatrix: [1]}}); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'convolveMatrix', kernelMatrix: [1, 2, 3, 4]}}); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'convolveMatrix', kernelMatrix: [[], []]}}); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'convolveMatrix', kernelMatrix: [[1, 2], []]}}); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'convolveMatrix', kernelMatrix: [[], [1, 2]]}}); });
+  // This should not throw an error
+  ctx.beginLayer({filter:
+    {name: 'convolveMatrix', kernelMatrix: [[]]}});
+  ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'convolveMatrix', kernelMatrix: [[1]]}});
+  ctx.endLayer();
+  t.done();
+
+});
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.convolveMatrix.exceptions.worker.js b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.convolveMatrix.exceptions.worker.js
new file mode 100644
index 0000000000..fa3be89ba2
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.convolveMatrix.exceptions.worker.js
@@ -0,0 +1,56 @@
+// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
+// OffscreenCanvas test in a worker:2d.filter.layers.convolveMatrix.exceptions
+// Description:Test exceptions on CanvasFilter() convolveMatrix
+// Note:
+
+importScripts("/resources/testharness.js");
+importScripts("/html/canvas/resources/canvas-tests.js");
+
+var t = async_test("Test exceptions on CanvasFilter() convolveMatrix");
+var t_pass = t.done.bind(t);
+var t_fail = t.step_func(function(reason) {
+    throw reason;
+});
+t.step(function() {
+
+  var canvas = new OffscreenCanvas(100, 50);
+  var ctx = canvas.getContext('2d');
+
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'convolveMatrix'}}); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'convolveMatrix', divisor: 2}}); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'convolveMatrix', kernelMatrix: null}}); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'convolveMatrix', kernelMatrix: 1}}); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'convolveMatrix', kernelMatrix: [[1, 0], [0]]}}); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'convolveMatrix', kernelMatrix: [[1, 'a'], [0]]}}); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'convolveMatrix', kernelMatrix: [[1, 0], 0]}}); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'convolveMatrix', kernelMatrix: [[1, 0], [0, Infinity]]}}); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'convolveMatrix', kernelMatrix: []}}); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'convolveMatrix', kernelMatrix: [1]}}); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'convolveMatrix', kernelMatrix: [1, 2, 3, 4]}}); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'convolveMatrix', kernelMatrix: [[], []]}}); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'convolveMatrix', kernelMatrix: [[1, 2], []]}}); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'convolveMatrix', kernelMatrix: [[], [1, 2]]}}); });
+  // This should not throw an error
+  ctx.beginLayer({filter:
+    {name: 'convolveMatrix', kernelMatrix: [[]]}});
+  ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'convolveMatrix', kernelMatrix: [[1]]}});
+  ctx.endLayer();
+  t.done();
+});
+done();
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.dropShadow-expected.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.dropShadow-expected.html
new file mode 100644
index 0000000000..1719d99b4a
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.dropShadow-expected.html
@@ -0,0 +1,57 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>Canvas test: 2d.filter.layers.dropShadow</title>
+<h1>2d.filter.layers.dropShadow</h1>
+<p class="desc">Test CanvasFilter() dropShadow object.</p>
+
+<svg xmlns="http://www.w3.org/2000/svg"
+     width=520 height=420
+     color-interpolation-filters="sRGB">
+  <rect x=0 y=0 width=100% height=50 fill="teal" />
+  <rect x=0 y=100 width=100% height=50 fill="teal" />
+  <rect x=0 y=200 width=100% height=50 fill="teal" />
+  <rect x=0 y=300 width=100% height=50 fill="teal" />
+
+  <rect x=10 y=10 width=80 height=80 fill="crimson"
+        filter="drop-shadow(2px 2px 2px black)"/>
+  <rect x=110 y=10 width=80 height=80 fill="crimson"
+        filter="drop-shadow(9px 12px 5px rgba(128, 0, 128, 0.7))"/>
+
+  <rect x=10 y=110 width=80 height=80 fill="crimson"
+        filter="drop-shadow(9px 12px 3px purple)"/>
+  <rect x=110 y=110 width=80 height=80 fill="crimson"
+        filter="drop-shadow(9px 12px 3px LinkText)"/>
+  <rect x=210 y=110 width=80 height=80 fill="crimson"
+        filter="drop-shadow(9px 12px 3px rgba(20, 50, 130, 1))"/>
+  <rect x=310 y=110 width=80 height=80 fill="crimson"
+        filter="drop-shadow(9px 12px 3px rgba(20, 50, 130, 0.7))"/>
+  <rect x=410 y=110 width=80 height=80 fill="crimson"
+        filter="drop-shadow(9px 12px 3px rgba(20, 50, 130, 0.49))"/>
+
+  <rect x=10 y=210 width=80 height=80 fill="crimson"
+        filter="drop-shadow(9px 12px 0px purple)"/>
+  <rect x=110 y=210 width=80 height=80 fill="crimson"
+        filter="drop-shadow(9px 12px 5px purple)"/>
+  <rect x=210 y=210 width=80 height=80 fill="crimson"
+        filter="drop-shadow(9px 12px 0px purple)"/>
+  <filter id="separable-filter"
+          x="-100%" y="-100%" width="300%" height="300%">
+    <feDropShadow dx=9 dy=12 stdDeviation="3 5" flood-color="purple"/>
+  </filter>
+  <rect x=310 y=210 width=80 height=80 fill="crimson"
+        filter="url(#separable-filter)"/>
+  <rect x=410 y=210 width=80 height=80 fill="crimson"
+        filter="drop-shadow(9px 12px 0px purple)"/>
+
+  <rect x=10 y=310 width=80 height=80 fill="crimson"
+        filter="drop-shadow(-5px 0px 0px purple)"/>
+  <filter id="separable-filter-degenerate"
+          x="-100%" y="-100%" width="300%" height="300%">
+    <feDropShadow dx=0 dy=5 stdDeviation="0 3"
+        flood-color="rgba(128, 0, 128, 0.8)"/>
+  </filter>
+  <rect x=110 y=310 width=80 height=80 fill="crimson"
+        filter="url(#separable-filter-degenerate)"/>
+  <rect x=210 y=310 width=80 height=80 fill="crimson"
+        filter="drop-shadow(1px 10px 0px rgba(128, 0, 128, 0.4))"/>
+</svg>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.dropShadow.exceptions.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.dropShadow.exceptions.html
new file mode 100644
index 0000000000..10392dea5a
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.dropShadow.exceptions.html
@@ -0,0 +1,270 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>OffscreenCanvas test: 2d.filter.layers.dropShadow.exceptions</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+
+<h1>2d.filter.layers.dropShadow.exceptions</h1>
+<p class="desc">Test exceptions on CanvasFilter() dropShadow object</p>
+
+
+<script>
+var t = async_test("Test exceptions on CanvasFilter() dropShadow object");
+var t_pass = t.done.bind(t);
+var t_fail = t.step_func(function(reason) {
+    throw reason;
+});
+t.step(function() {
+
+  var canvas = new OffscreenCanvas(100, 50);
+  var ctx = canvas.getContext('2d');
+
+  // Should not throw an error.
+  // dx
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: 10}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: -1}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: 0.5}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: null}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: true}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: false}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: []}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: [20]}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: '30'}}); ctx.endLayer();
+  // dy
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: 10}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: -1}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: 0.5}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: null}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: true}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: false}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: []}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: [20]}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: '30'}}); ctx.endLayer();
+  // floodOpacity
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: 10}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: -1}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: 0.5}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: null}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: true}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: false}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: []}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: [20]}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: '30'}}); ctx.endLayer();
+  // dx
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: 10}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: -1}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: 0.5}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: null}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: true}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: false}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: []}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: [20]}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: '30'}}); ctx.endLayer();
+  // dy
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: 10}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: -1}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: 0.5}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: null}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: true}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: false}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: []}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: [20]}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: '30'}}); ctx.endLayer();
+  // floodOpacity
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: 10}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: -1}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: 0.5}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: null}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: true}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: false}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: []}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: [20]}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: '30'}}); ctx.endLayer();
+  // stdDeviation
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: 10}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: -1}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: 0.5}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: null}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: true}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: false}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: []}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: [20]}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: '30'}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: [10, -1]}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: [0.5, null]}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: [true, false]}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: [[], [20]]}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: ['30', ['40']]}}); ctx.endLayer();
+  // floodColor
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', floodColor: 'red'}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', floodColor: 'canvas'}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', floodColor: 'rgba(4, -3, 0.5, 1)'}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', floodColor: '#aabbccdd'}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', floodColor: '#abcd'}}); ctx.endLayer();
+
+  // Should throw a TypeError.
+  // dx
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: NaN}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: Infinity}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: -Infinity}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: undefined}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: 'test'}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: {}}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: [1, 2]}}); ctx.endLayer(); });
+  // dy
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: NaN}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: Infinity}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: -Infinity}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: undefined}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: 'test'}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: {}}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: [1, 2]}}); ctx.endLayer(); });
+  // floodOpacity
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: NaN}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: Infinity}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: -Infinity}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: undefined}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: 'test'}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: {}}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: [1, 2]}}); ctx.endLayer(); });
+  // stdDeviation
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: NaN}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: Infinity}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: -Infinity}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: undefined}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: 'test'}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: {}}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: [1, 2, 3]}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: [1, NaN]}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: [1, Infinity]}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: [1, -Infinity]}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: [1, undefined]}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: [1, 'test']}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: [1, {}]}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: [1, [2, 3]]}}); ctx.endLayer(); });
+  // floodColor
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', floodColor: 'test'}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', floodColor: 'rgba(NaN, 3, 2, 1)'}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', floodColor: 10}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', floodColor: undefined}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', floodColor: null}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', floodColor: NaN}}); ctx.endLayer(); });
+  t.done();
+
+});
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.dropShadow.exceptions.worker.js b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.dropShadow.exceptions.worker.js
new file mode 100644
index 0000000000..86b8c56af6
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.dropShadow.exceptions.worker.js
@@ -0,0 +1,265 @@
+// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
+// OffscreenCanvas test in a worker:2d.filter.layers.dropShadow.exceptions
+// Description:Test exceptions on CanvasFilter() dropShadow object
+// Note:
+
+importScripts("/resources/testharness.js");
+importScripts("/html/canvas/resources/canvas-tests.js");
+
+var t = async_test("Test exceptions on CanvasFilter() dropShadow object");
+var t_pass = t.done.bind(t);
+var t_fail = t.step_func(function(reason) {
+    throw reason;
+});
+t.step(function() {
+
+  var canvas = new OffscreenCanvas(100, 50);
+  var ctx = canvas.getContext('2d');
+
+  // Should not throw an error.
+  // dx
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: 10}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: -1}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: 0.5}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: null}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: true}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: false}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: []}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: [20]}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: '30'}}); ctx.endLayer();
+  // dy
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: 10}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: -1}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: 0.5}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: null}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: true}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: false}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: []}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: [20]}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: '30'}}); ctx.endLayer();
+  // floodOpacity
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: 10}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: -1}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: 0.5}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: null}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: true}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: false}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: []}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: [20]}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: '30'}}); ctx.endLayer();
+  // dx
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: 10}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: -1}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: 0.5}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: null}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: true}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: false}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: []}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: [20]}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: '30'}}); ctx.endLayer();
+  // dy
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: 10}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: -1}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: 0.5}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: null}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: true}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: false}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: []}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: [20]}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: '30'}}); ctx.endLayer();
+  // floodOpacity
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: 10}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: -1}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: 0.5}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: null}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: true}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: false}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: []}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: [20]}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: '30'}}); ctx.endLayer();
+  // stdDeviation
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: 10}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: -1}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: 0.5}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: null}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: true}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: false}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: []}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: [20]}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: '30'}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: [10, -1]}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: [0.5, null]}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: [true, false]}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: [[], [20]]}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: ['30', ['40']]}}); ctx.endLayer();
+  // floodColor
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', floodColor: 'red'}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', floodColor: 'canvas'}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', floodColor: 'rgba(4, -3, 0.5, 1)'}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', floodColor: '#aabbccdd'}}); ctx.endLayer();
+  ctx.beginLayer({filter:
+    {name: 'dropShadow', floodColor: '#abcd'}}); ctx.endLayer();
+
+  // Should throw a TypeError.
+  // dx
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: NaN}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: Infinity}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: -Infinity}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: undefined}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: 'test'}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: {}}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', dx: [1, 2]}}); ctx.endLayer(); });
+  // dy
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: NaN}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: Infinity}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: -Infinity}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: undefined}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: 'test'}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: {}}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', dy: [1, 2]}}); ctx.endLayer(); });
+  // floodOpacity
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: NaN}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: Infinity}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: -Infinity}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: undefined}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: 'test'}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: {}}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', floodOpacity: [1, 2]}}); ctx.endLayer(); });
+  // stdDeviation
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: NaN}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: Infinity}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: -Infinity}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: undefined}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: 'test'}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: {}}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: [1, 2, 3]}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: [1, NaN]}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: [1, Infinity]}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: [1, -Infinity]}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: [1, undefined]}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: [1, 'test']}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: [1, {}]}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', stdDeviation: [1, [2, 3]]}}); ctx.endLayer(); });
+  // floodColor
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', floodColor: 'test'}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', floodColor: 'rgba(NaN, 3, 2, 1)'}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', floodColor: 10}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', floodColor: undefined}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', floodColor: null}}); ctx.endLayer(); });
+  assert_throws_js(TypeError, function() { ctx.beginLayer({filter:
+    {name: 'dropShadow', floodColor: NaN}}); ctx.endLayer(); });
+  t.done();
+});
+done();
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.dropShadow.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.dropShadow.html
new file mode 100644
index 0000000000..1ecf309fc4
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.dropShadow.html
@@ -0,0 +1,97 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<link rel="match" href="2d.filter.layers.dropShadow-expected.html">
+<title>Canvas test: 2d.filter.layers.dropShadow</title>
+<h1>2d.filter.layers.dropShadow</h1>
+<p class="desc">Test CanvasFilter() dropShadow object.</p>
+<canvas id="canvas" width="520" height="420">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = new OffscreenCanvas(520, 420);
+  const ctx = canvas.getContext('2d');
+
+  ctx.fillStyle = 'teal';
+  ctx.fillRect(0, 0, 520, 50);
+  ctx.fillRect(0, 100, 520, 50);
+  ctx.fillRect(0, 200, 520, 50);
+  ctx.fillRect(0, 300, 520, 50);
+
+  ctx.fillStyle = 'crimson';
+
+  // Parameter defaults.
+  ctx.beginLayer({filter: {name: 'dropShadow'}});
+  ctx.fillRect(10, 10, 80, 80);
+  ctx.endLayer();
+  // All parameters specified.
+  ctx.beginLayer({filter: {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 5,
+     floodColor: 'purple', floodOpacity: 0.7}});
+  ctx.fillRect(110, 10, 80, 80);
+  ctx.endLayer();
+  // Named color.
+  ctx.beginLayer({filter: {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 3,
+     floodColor: 'purple'}});
+  ctx.fillRect(10, 110, 80, 80);
+  ctx.endLayer();
+  // System color.
+  ctx.beginLayer({filter: {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 3,
+     floodColor: 'LinkText'}});
+  ctx.fillRect(110, 110, 80, 80);
+  ctx.endLayer();
+  // Numerical color.
+  ctx.beginLayer({filter: {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 3,
+     floodColor: 'rgba(20, 50, 130, 1)'}});
+  ctx.fillRect(210, 110, 80, 80);
+  ctx.endLayer();
+  // Transparent floodColor.
+  ctx.beginLayer({filter: {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 3,
+     floodColor: 'rgba(20, 50, 130, 0.7)'}});
+  ctx.fillRect(310, 110, 80, 80);
+  ctx.endLayer();
+  // Transparent floodColor and floodOpacity.
+  ctx.beginLayer({filter: {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 3,
+     floodColor: 'rgba(20, 50, 130, 0.7)', floodOpacity: 0.7}});
+  ctx.fillRect(410, 110, 80, 80);
+  ctx.endLayer();
+  // No blur.
+  ctx.beginLayer({filter: {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 0,
+     floodColor: 'purple'}});
+  ctx.fillRect(10, 210, 80, 80);
+  ctx.endLayer();
+  // Single float blur.
+  ctx.beginLayer({filter: {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 5,
+     floodColor: 'purple'}});
+  ctx.fillRect(110, 210, 80, 80);
+  ctx.endLayer();
+  // Single negative float blur.
+  ctx.beginLayer({filter: {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: -5,
+     floodColor: 'purple'}});
+  ctx.fillRect(210, 210, 80, 80);
+  ctx.endLayer();
+  // Two floats (X&Y) blur.
+  ctx.beginLayer({filter: {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: [3, 5],
+     floodColor: 'purple'}});
+  ctx.fillRect(310, 210, 80, 80);
+  ctx.endLayer();
+  // Two negative floats (X&Y) blur.
+  ctx.beginLayer({filter: {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: [-3, -5],
+     floodColor: 'purple'}});
+  ctx.fillRect(410, 210, 80, 80);
+  ctx.endLayer();
+  // Degenerate parameter values.
+  ctx.beginLayer({filter: {name: 'dropShadow', dx: [-5], dy: [], stdDeviation: null,
+     floodColor: 'purple', floodOpacity: [2]}});
+  ctx.fillRect(10, 310, 80, 80);
+  ctx.endLayer();
+  ctx.beginLayer({filter: {name: 'dropShadow', dx: null, dy: '5', stdDeviation: [[-5], ['3']],
+     floodColor: 'purple', floodOpacity: '0.8'}});
+  ctx.fillRect(110, 310, 80, 80);
+  ctx.endLayer();
+  ctx.beginLayer({filter: {name: 'dropShadow', dx: true, dy: ['10'], stdDeviation: false,
+     floodColor: 'purple', floodOpacity: ['0.4']}});
+  ctx.fillRect(210, 310, 80, 80);
+  ctx.endLayer();
+
+  const outputCanvas = document.getElementById("canvas");
+  outputCanvas.getContext('2d').drawImage(canvas, 0, 0);
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.dropShadow.w.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.dropShadow.w.html
new file mode 100644
index 0000000000..e73b573779
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.dropShadow.w.html
@@ -0,0 +1,111 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<html class="reftest-wait">
+<link rel="match" href="2d.filter.layers.dropShadow-expected.html">
+<title>Canvas test: 2d.filter.layers.dropShadow</title>
+<h1>2d.filter.layers.dropShadow</h1>
+<p class="desc">Test CanvasFilter() dropShadow object.</p>
+<canvas id="canvas" width="520" height="420">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script id='myWorker' type='text/worker'>
+  self.onmessage = function(e) {
+    const canvas = new OffscreenCanvas(520, 420);
+    const ctx = canvas.getContext('2d');
+
+    ctx.fillStyle = 'teal';
+    ctx.fillRect(0, 0, 520, 50);
+    ctx.fillRect(0, 100, 520, 50);
+    ctx.fillRect(0, 200, 520, 50);
+    ctx.fillRect(0, 300, 520, 50);
+
+    ctx.fillStyle = 'crimson';
+
+    // Parameter defaults.
+    ctx.beginLayer({filter: {name: 'dropShadow'}});
+    ctx.fillRect(10, 10, 80, 80);
+    ctx.endLayer();
+    // All parameters specified.
+    ctx.beginLayer({filter: {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 5,
+       floodColor: 'purple', floodOpacity: 0.7}});
+    ctx.fillRect(110, 10, 80, 80);
+    ctx.endLayer();
+    // Named color.
+    ctx.beginLayer({filter: {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 3,
+       floodColor: 'purple'}});
+    ctx.fillRect(10, 110, 80, 80);
+    ctx.endLayer();
+    // System color.
+    ctx.beginLayer({filter: {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 3,
+       floodColor: 'LinkText'}});
+    ctx.fillRect(110, 110, 80, 80);
+    ctx.endLayer();
+    // Numerical color.
+    ctx.beginLayer({filter: {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 3,
+       floodColor: 'rgba(20, 50, 130, 1)'}});
+    ctx.fillRect(210, 110, 80, 80);
+    ctx.endLayer();
+    // Transparent floodColor.
+    ctx.beginLayer({filter: {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 3,
+       floodColor: 'rgba(20, 50, 130, 0.7)'}});
+    ctx.fillRect(310, 110, 80, 80);
+    ctx.endLayer();
+    // Transparent floodColor and floodOpacity.
+    ctx.beginLayer({filter: {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 3,
+       floodColor: 'rgba(20, 50, 130, 0.7)', floodOpacity: 0.7}});
+    ctx.fillRect(410, 110, 80, 80);
+    ctx.endLayer();
+    // No blur.
+    ctx.beginLayer({filter: {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 0,
+       floodColor: 'purple'}});
+    ctx.fillRect(10, 210, 80, 80);
+    ctx.endLayer();
+    // Single float blur.
+    ctx.beginLayer({filter: {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 5,
+       floodColor: 'purple'}});
+    ctx.fillRect(110, 210, 80, 80);
+    ctx.endLayer();
+    // Single negative float blur.
+    ctx.beginLayer({filter: {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: -5,
+       floodColor: 'purple'}});
+    ctx.fillRect(210, 210, 80, 80);
+    ctx.endLayer();
+    // Two floats (X&Y) blur.
+    ctx.beginLayer({filter: {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: [3, 5],
+       floodColor: 'purple'}});
+    ctx.fillRect(310, 210, 80, 80);
+    ctx.endLayer();
+    // Two negative floats (X&Y) blur.
+    ctx.beginLayer({filter: {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: [-3, -5],
+       floodColor: 'purple'}});
+    ctx.fillRect(410, 210, 80, 80);
+    ctx.endLayer();
+    // Degenerate parameter values.
+    ctx.beginLayer({filter: {name: 'dropShadow', dx: [-5], dy: [], stdDeviation: null,
+       floodColor: 'purple', floodOpacity: [2]}});
+    ctx.fillRect(10, 310, 80, 80);
+    ctx.endLayer();
+    ctx.beginLayer({filter: {name: 'dropShadow', dx: null, dy: '5', stdDeviation: [[-5], ['3']],
+       floodColor: 'purple', floodOpacity: '0.8'}});
+    ctx.fillRect(110, 310, 80, 80);
+    ctx.endLayer();
+    ctx.beginLayer({filter: {name: 'dropShadow', dx: true, dy: ['10'], stdDeviation: false,
+       floodColor: 'purple', floodOpacity: ['0.4']}});
+    ctx.fillRect(210, 310, 80, 80);
+    ctx.endLayer();
+
+    const bitmap = canvas.transferToImageBitmap();
+    self.postMessage(bitmap, bitmap);
+  };
+</script>
+<script>
+  const blob = new Blob([document.getElementById('myWorker').textContent]);
+  const worker = new Worker(URL.createObjectURL(blob));
+  worker.addEventListener('message', msg => {
+    const outputCtx = document.getElementById("canvas").getContext('2d');
+    outputCtx.drawImage(msg.data, 0, 0);
+    document.documentElement.classList.remove("reftest-wait");
+  });
+  worker.postMessage(null);
+</script>
+</html>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.gaussianBlur.isotropic-expected.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.gaussianBlur.isotropic-expected.html
new file mode 100644
index 0000000000..4f93754862
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.gaussianBlur.isotropic-expected.html
@@ -0,0 +1,15 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>Canvas test: 2d.filter.layers.gaussianBlur.isotropic</title>
+<h1>2d.filter.layers.gaussianBlur.isotropic</h1>
+<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
+
+<svg xmlns="http://www.w3.org/2000/svg"
+     width="100" height="100"
+     color-interpolation-filters="sRGB">
+  <filter id="blur" x="-50%" y="-50%" width="200%" height="200%">
+    <feGaussianBlur stdDeviation="4 4" />
+  </filter>
+  <rect x="25" y="25" width="50" height="50"
+        fill="teal" filter="url(#blur)" />
+</svg>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.gaussianBlur.isotropic.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.gaussianBlur.isotropic.html
new file mode 100644
index 0000000000..50a98df1be
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.gaussianBlur.isotropic.html
@@ -0,0 +1,24 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<link rel="match" href="2d.filter.layers.gaussianBlur.isotropic-expected.html">
+<title>Canvas test: 2d.filter.layers.gaussianBlur.isotropic</title>
+<h1>2d.filter.layers.gaussianBlur.isotropic</h1>
+<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = new OffscreenCanvas(100, 100);
+  const ctx = canvas.getContext('2d');
+
+  ctx.fillStyle = 'teal';
+  ctx.beginLayer({filter: {
+      name: 'gaussianBlur',
+      stdDeviation: [4, 4],
+  }});
+  ctx.fillRect(25, 25, 50, 50);
+  ctx.endLayer();
+
+  const outputCanvas = document.getElementById("canvas");
+  outputCanvas.getContext('2d').drawImage(canvas, 0, 0);
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.gaussianBlur.isotropic.w.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.gaussianBlur.isotropic.w.html
new file mode 100644
index 0000000000..a68b8e78a2
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.gaussianBlur.isotropic.w.html
@@ -0,0 +1,38 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<html class="reftest-wait">
+<link rel="match" href="2d.filter.layers.gaussianBlur.isotropic-expected.html">
+<title>Canvas test: 2d.filter.layers.gaussianBlur.isotropic</title>
+<h1>2d.filter.layers.gaussianBlur.isotropic</h1>
+<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script id='myWorker' type='text/worker'>
+  self.onmessage = function(e) {
+    const canvas = new OffscreenCanvas(100, 100);
+    const ctx = canvas.getContext('2d');
+
+    ctx.fillStyle = 'teal';
+    ctx.beginLayer({filter: {
+        name: 'gaussianBlur',
+        stdDeviation: [4, 4],
+    }});
+    ctx.fillRect(25, 25, 50, 50);
+    ctx.endLayer();
+
+    const bitmap = canvas.transferToImageBitmap();
+    self.postMessage(bitmap, bitmap);
+  };
+</script>
+<script>
+  const blob = new Blob([document.getElementById('myWorker').textContent]);
+  const worker = new Worker(URL.createObjectURL(blob));
+  worker.addEventListener('message', msg => {
+    const outputCtx = document.getElementById("canvas").getContext('2d');
+    outputCtx.drawImage(msg.data, 0, 0);
+    document.documentElement.classList.remove("reftest-wait");
+  });
+  worker.postMessage(null);
+</script>
+</html>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.gaussianBlur.mostly-x-expected.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.gaussianBlur.mostly-x-expected.html
new file mode 100644
index 0000000000..255270c192
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.gaussianBlur.mostly-x-expected.html
@@ -0,0 +1,15 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>Canvas test: 2d.filter.layers.gaussianBlur.mostly-x</title>
+<h1>2d.filter.layers.gaussianBlur.mostly-x</h1>
+<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
+
+<svg xmlns="http://www.w3.org/2000/svg"
+     width="100" height="100"
+     color-interpolation-filters="sRGB">
+  <filter id="blur" x="-50%" y="-50%" width="200%" height="200%">
+    <feGaussianBlur stdDeviation="4 1" />
+  </filter>
+  <rect x="25" y="25" width="50" height="50"
+        fill="teal" filter="url(#blur)" />
+</svg>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.gaussianBlur.mostly-x.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.gaussianBlur.mostly-x.html
new file mode 100644
index 0000000000..efc634796c
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.gaussianBlur.mostly-x.html
@@ -0,0 +1,24 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<link rel="match" href="2d.filter.layers.gaussianBlur.mostly-x-expected.html">
+<title>Canvas test: 2d.filter.layers.gaussianBlur.mostly-x</title>
+<h1>2d.filter.layers.gaussianBlur.mostly-x</h1>
+<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = new OffscreenCanvas(100, 100);
+  const ctx = canvas.getContext('2d');
+
+  ctx.fillStyle = 'teal';
+  ctx.beginLayer({filter: {
+      name: 'gaussianBlur',
+      stdDeviation: [4, 1],
+  }});
+  ctx.fillRect(25, 25, 50, 50);
+  ctx.endLayer();
+
+  const outputCanvas = document.getElementById("canvas");
+  outputCanvas.getContext('2d').drawImage(canvas, 0, 0);
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.gaussianBlur.mostly-x.w.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.gaussianBlur.mostly-x.w.html
new file mode 100644
index 0000000000..7d20d78503
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.gaussianBlur.mostly-x.w.html
@@ -0,0 +1,38 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<html class="reftest-wait">
+<link rel="match" href="2d.filter.layers.gaussianBlur.mostly-x-expected.html">
+<title>Canvas test: 2d.filter.layers.gaussianBlur.mostly-x</title>
+<h1>2d.filter.layers.gaussianBlur.mostly-x</h1>
+<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script id='myWorker' type='text/worker'>
+  self.onmessage = function(e) {
+    const canvas = new OffscreenCanvas(100, 100);
+    const ctx = canvas.getContext('2d');
+
+    ctx.fillStyle = 'teal';
+    ctx.beginLayer({filter: {
+        name: 'gaussianBlur',
+        stdDeviation: [4, 1],
+    }});
+    ctx.fillRect(25, 25, 50, 50);
+    ctx.endLayer();
+
+    const bitmap = canvas.transferToImageBitmap();
+    self.postMessage(bitmap, bitmap);
+  };
+</script>
+<script>
+  const blob = new Blob([document.getElementById('myWorker').textContent]);
+  const worker = new Worker(URL.createObjectURL(blob));
+  worker.addEventListener('message', msg => {
+    const outputCtx = document.getElementById("canvas").getContext('2d');
+    outputCtx.drawImage(msg.data, 0, 0);
+    document.documentElement.classList.remove("reftest-wait");
+  });
+  worker.postMessage(null);
+</script>
+</html>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.gaussianBlur.mostly-y-expected.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.gaussianBlur.mostly-y-expected.html
new file mode 100644
index 0000000000..76a46b1533
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.gaussianBlur.mostly-y-expected.html
@@ -0,0 +1,15 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>Canvas test: 2d.filter.layers.gaussianBlur.mostly-y</title>
+<h1>2d.filter.layers.gaussianBlur.mostly-y</h1>
+<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
+
+<svg xmlns="http://www.w3.org/2000/svg"
+     width="100" height="100"
+     color-interpolation-filters="sRGB">
+  <filter id="blur" x="-50%" y="-50%" width="200%" height="200%">
+    <feGaussianBlur stdDeviation="1 4" />
+  </filter>
+  <rect x="25" y="25" width="50" height="50"
+        fill="teal" filter="url(#blur)" />
+</svg>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.gaussianBlur.mostly-y.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.gaussianBlur.mostly-y.html
new file mode 100644
index 0000000000..bdc6e66fe5
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.gaussianBlur.mostly-y.html
@@ -0,0 +1,24 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<link rel="match" href="2d.filter.layers.gaussianBlur.mostly-y-expected.html">
+<title>Canvas test: 2d.filter.layers.gaussianBlur.mostly-y</title>
+<h1>2d.filter.layers.gaussianBlur.mostly-y</h1>
+<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = new OffscreenCanvas(100, 100);
+  const ctx = canvas.getContext('2d');
+
+  ctx.fillStyle = 'teal';
+  ctx.beginLayer({filter: {
+      name: 'gaussianBlur',
+      stdDeviation: [1, 4],
+  }});
+  ctx.fillRect(25, 25, 50, 50);
+  ctx.endLayer();
+
+  const outputCanvas = document.getElementById("canvas");
+  outputCanvas.getContext('2d').drawImage(canvas, 0, 0);
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.gaussianBlur.mostly-y.w.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.gaussianBlur.mostly-y.w.html
new file mode 100644
index 0000000000..dfd6438b19
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.gaussianBlur.mostly-y.w.html
@@ -0,0 +1,38 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<html class="reftest-wait">
+<link rel="match" href="2d.filter.layers.gaussianBlur.mostly-y-expected.html">
+<title>Canvas test: 2d.filter.layers.gaussianBlur.mostly-y</title>
+<h1>2d.filter.layers.gaussianBlur.mostly-y</h1>
+<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script id='myWorker' type='text/worker'>
+  self.onmessage = function(e) {
+    const canvas = new OffscreenCanvas(100, 100);
+    const ctx = canvas.getContext('2d');
+
+    ctx.fillStyle = 'teal';
+    ctx.beginLayer({filter: {
+        name: 'gaussianBlur',
+        stdDeviation: [1, 4],
+    }});
+    ctx.fillRect(25, 25, 50, 50);
+    ctx.endLayer();
+
+    const bitmap = canvas.transferToImageBitmap();
+    self.postMessage(bitmap, bitmap);
+  };
+</script>
+<script>
+  const blob = new Blob([document.getElementById('myWorker').textContent]);
+  const worker = new Worker(URL.createObjectURL(blob));
+  worker.addEventListener('message', msg => {
+    const outputCtx = document.getElementById("canvas").getContext('2d');
+    outputCtx.drawImage(msg.data, 0, 0);
+    document.documentElement.classList.remove("reftest-wait");
+  });
+  worker.postMessage(null);
+</script>
+</html>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.gaussianBlur.x-only-expected.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.gaussianBlur.x-only-expected.html
new file mode 100644
index 0000000000..26741f9847
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.gaussianBlur.x-only-expected.html
@@ -0,0 +1,15 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>Canvas test: 2d.filter.layers.gaussianBlur.x-only</title>
+<h1>2d.filter.layers.gaussianBlur.x-only</h1>
+<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
+
+<svg xmlns="http://www.w3.org/2000/svg"
+     width="100" height="100"
+     color-interpolation-filters="sRGB">
+  <filter id="blur" x="-50%" y="-50%" width="200%" height="200%">
+    <feGaussianBlur stdDeviation="4 0" />
+  </filter>
+  <rect x="25" y="25" width="50" height="50"
+        fill="teal" filter="url(#blur)" />
+</svg>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.gaussianBlur.x-only.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.gaussianBlur.x-only.html
new file mode 100644
index 0000000000..0d42acb8b5
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.gaussianBlur.x-only.html
@@ -0,0 +1,24 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<link rel="match" href="2d.filter.layers.gaussianBlur.x-only-expected.html">
+<title>Canvas test: 2d.filter.layers.gaussianBlur.x-only</title>
+<h1>2d.filter.layers.gaussianBlur.x-only</h1>
+<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = new OffscreenCanvas(100, 100);
+  const ctx = canvas.getContext('2d');
+
+  ctx.fillStyle = 'teal';
+  ctx.beginLayer({filter: {
+      name: 'gaussianBlur',
+      stdDeviation: [4, 0],
+  }});
+  ctx.fillRect(25, 25, 50, 50);
+  ctx.endLayer();
+
+  const outputCanvas = document.getElementById("canvas");
+  outputCanvas.getContext('2d').drawImage(canvas, 0, 0);
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.gaussianBlur.x-only.w.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.gaussianBlur.x-only.w.html
new file mode 100644
index 0000000000..b235c7ad38
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.gaussianBlur.x-only.w.html
@@ -0,0 +1,38 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<html class="reftest-wait">
+<link rel="match" href="2d.filter.layers.gaussianBlur.x-only-expected.html">
+<title>Canvas test: 2d.filter.layers.gaussianBlur.x-only</title>
+<h1>2d.filter.layers.gaussianBlur.x-only</h1>
+<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script id='myWorker' type='text/worker'>
+  self.onmessage = function(e) {
+    const canvas = new OffscreenCanvas(100, 100);
+    const ctx = canvas.getContext('2d');
+
+    ctx.fillStyle = 'teal';
+    ctx.beginLayer({filter: {
+        name: 'gaussianBlur',
+        stdDeviation: [4, 0],
+    }});
+    ctx.fillRect(25, 25, 50, 50);
+    ctx.endLayer();
+
+    const bitmap = canvas.transferToImageBitmap();
+    self.postMessage(bitmap, bitmap);
+  };
+</script>
+<script>
+  const blob = new Blob([document.getElementById('myWorker').textContent]);
+  const worker = new Worker(URL.createObjectURL(blob));
+  worker.addEventListener('message', msg => {
+    const outputCtx = document.getElementById("canvas").getContext('2d');
+    outputCtx.drawImage(msg.data, 0, 0);
+    document.documentElement.classList.remove("reftest-wait");
+  });
+  worker.postMessage(null);
+</script>
+</html>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.gaussianBlur.y-only-expected.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.gaussianBlur.y-only-expected.html
new file mode 100644
index 0000000000..d00eec6b57
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.gaussianBlur.y-only-expected.html
@@ -0,0 +1,15 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>Canvas test: 2d.filter.layers.gaussianBlur.y-only</title>
+<h1>2d.filter.layers.gaussianBlur.y-only</h1>
+<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
+
+<svg xmlns="http://www.w3.org/2000/svg"
+     width="100" height="100"
+     color-interpolation-filters="sRGB">
+  <filter id="blur" x="-50%" y="-50%" width="200%" height="200%">
+    <feGaussianBlur stdDeviation="0 4" />
+  </filter>
+  <rect x="25" y="25" width="50" height="50"
+        fill="teal" filter="url(#blur)" />
+</svg>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.gaussianBlur.y-only.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.gaussianBlur.y-only.html
new file mode 100644
index 0000000000..c9bc85d699
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.gaussianBlur.y-only.html
@@ -0,0 +1,24 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<link rel="match" href="2d.filter.layers.gaussianBlur.y-only-expected.html">
+<title>Canvas test: 2d.filter.layers.gaussianBlur.y-only</title>
+<h1>2d.filter.layers.gaussianBlur.y-only</h1>
+<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = new OffscreenCanvas(100, 100);
+  const ctx = canvas.getContext('2d');
+
+  ctx.fillStyle = 'teal';
+  ctx.beginLayer({filter: {
+      name: 'gaussianBlur',
+      stdDeviation: [0, 4],
+  }});
+  ctx.fillRect(25, 25, 50, 50);
+  ctx.endLayer();
+
+  const outputCanvas = document.getElementById("canvas");
+  outputCanvas.getContext('2d').drawImage(canvas, 0, 0);
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.gaussianBlur.y-only.w.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.gaussianBlur.y-only.w.html
new file mode 100644
index 0000000000..5deb96c255
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.gaussianBlur.y-only.w.html
@@ -0,0 +1,38 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<html class="reftest-wait">
+<link rel="match" href="2d.filter.layers.gaussianBlur.y-only-expected.html">
+<title>Canvas test: 2d.filter.layers.gaussianBlur.y-only</title>
+<h1>2d.filter.layers.gaussianBlur.y-only</h1>
+<p class="desc">Test CanvasFilter() with gaussianBlur.</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script id='myWorker' type='text/worker'>
+  self.onmessage = function(e) {
+    const canvas = new OffscreenCanvas(100, 100);
+    const ctx = canvas.getContext('2d');
+
+    ctx.fillStyle = 'teal';
+    ctx.beginLayer({filter: {
+        name: 'gaussianBlur',
+        stdDeviation: [0, 4],
+    }});
+    ctx.fillRect(25, 25, 50, 50);
+    ctx.endLayer();
+
+    const bitmap = canvas.transferToImageBitmap();
+    self.postMessage(bitmap, bitmap);
+  };
+</script>
+<script>
+  const blob = new Blob([document.getElementById('myWorker').textContent]);
+  const worker = new Worker(URL.createObjectURL(blob));
+  worker.addEventListener('message', msg => {
+    const outputCtx = document.getElementById("canvas").getContext('2d');
+    outputCtx.drawImage(msg.data, 0, 0);
+    document.documentElement.classList.remove("reftest-wait");
+  });
+  worker.postMessage(null);
+</script>
+</html>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.turbulence.inputTypes.html b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.turbulence.inputTypes.html
new file mode 100644
index 0000000000..27f7748c84
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.turbulence.inputTypes.html
@@ -0,0 +1,131 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>OffscreenCanvas test: 2d.filter.layers.turbulence.inputTypes</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+
+<h1>2d.filter.layers.turbulence.inputTypes</h1>
+<p class="desc">Test exceptions on CanvasFilter() turbulence object</p>
+
+
+<script>
+var t = async_test("Test exceptions on CanvasFilter() turbulence object");
+var t_pass = t.done.bind(t);
+var t_fail = t.step_func(function(reason) {
+    throw reason;
+});
+t.step(function() {
+
+  var canvas = new OffscreenCanvas(100, 50);
+  var ctx = canvas.getContext('2d');
+
+  const errorTestCases = [
+    {baseFrequency: {}},
+    {baseFrequency: -1},
+    {baseFrequency: [0, -1]},
+    {baseFrequency: NaN},
+    {baseFrequency: Infinity},
+    {baseFrequency: undefined},
+    {baseFrequency: -Infinity},
+    {baseFrequency: 'test'},
+
+    {numOctaves: {}},
+    {numOctaves: -1},
+    {numOctaves: NaN},
+    {numOctaves: Infinity},
+    {numOctaves: undefined},
+    {numOctaves: -Infinity},
+    {numOctaves: [1, 1]},
+    {numOctaves: 'test'},
+
+    {seed: {}},
+    {seed: NaN},
+    {seed: Infinity},
+    {seed: undefined},
+    {seed: -Infinity},
+    {seed: [1, 1]},
+    {seed: 'test'},
+
+    {stitchTiles: {}},
+    {stitchTiles: NaN},
+    {stitchTiles: Infinity},
+    {stitchTiles: undefined},
+    {stitchTiles: -Infinity},
+    {stitchTiles: [1, 1]},
+    {stitchTiles: 'test'},
+    {stitchTiles: null},
+    {stitchTiles: []},
+    {stitchTiles: [10]},
+    {stitchTiles: 30},
+    {stitchTiles: false},
+    {stitchTiles: true},
+    {stitchTiles: '10'},
+    {stitchTiles: -1},
+
+    {type: {}},
+    {type: NaN},
+    {type: Infinity},
+    {type: undefined},
+    {type: -Infinity},
+    {type: [1, 1]},
+    {type: 'test'},
+    {type: null},
+    {type: []},
+    {type: [10]},
+    {type: 30},
+    {type: false},
+    {type: true},
+    {type: '10'},
+    {type: -1},
+  ]
+
+  // null and [] = 0 when parsed as number
+  const workingTestCases = [
+    {baseFrequency: null},
+    {baseFrequency: []},
+    {baseFrequency: [10]},
+    {baseFrequency: [10, 3]},
+    {baseFrequency: 30},
+    {baseFrequency: false},
+    {baseFrequency: true},
+    {baseFrequency: '10'},
+
+    {numOctaves: null},
+    {numOctaves: []},
+    {numOctaves: [10]},
+    {numOctaves: 30},
+    {numOctaves: false},
+    {numOctaves: true},
+    {numOctaves: '10'},
+
+    {seed: null},
+    {seed: []},
+    {seed: [10]},
+    {seed: 30},
+    {seed: false},
+    {seed: true},
+    {seed: '10'},
+    {seed: -1},
+
+    {stitchTiles: 'stitch'},
+    {stitchTiles: 'noStitch'},
+
+    {type: 'fractalNoise'},
+    {type: 'turbulence'},
+  ]
+
+  for (testCase of errorTestCases) {
+    const filterOptions = {...{name: 'turbulence'}, ...testCase};
+    assert_throws_js(TypeError, function() { ctx.beginLayer({filter: filterOptions}); });
+  }
+
+  for (testCase of workingTestCases) {
+    const filterOptions = {...{name: 'turbulence'}, ...testCase};
+    ctx.beginLayer({filter: filterOptions});
+    ctx.endLayer();
+  }
+  t.done();
+
+});
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.turbulence.inputTypes.worker.js b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.turbulence.inputTypes.worker.js
new file mode 100644
index 0000000000..3728566c99
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/filters/2d.filter.layers.turbulence.inputTypes.worker.js
@@ -0,0 +1,126 @@
+// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
+// OffscreenCanvas test in a worker:2d.filter.layers.turbulence.inputTypes
+// Description:Test exceptions on CanvasFilter() turbulence object
+// Note:
+
+importScripts("/resources/testharness.js");
+importScripts("/html/canvas/resources/canvas-tests.js");
+
+var t = async_test("Test exceptions on CanvasFilter() turbulence object");
+var t_pass = t.done.bind(t);
+var t_fail = t.step_func(function(reason) {
+    throw reason;
+});
+t.step(function() {
+
+  var canvas = new OffscreenCanvas(100, 50);
+  var ctx = canvas.getContext('2d');
+
+  const errorTestCases = [
+    {baseFrequency: {}},
+    {baseFrequency: -1},
+    {baseFrequency: [0, -1]},
+    {baseFrequency: NaN},
+    {baseFrequency: Infinity},
+    {baseFrequency: undefined},
+    {baseFrequency: -Infinity},
+    {baseFrequency: 'test'},
+
+    {numOctaves: {}},
+    {numOctaves: -1},
+    {numOctaves: NaN},
+    {numOctaves: Infinity},
+    {numOctaves: undefined},
+    {numOctaves: -Infinity},
+    {numOctaves: [1, 1]},
+    {numOctaves: 'test'},
+
+    {seed: {}},
+    {seed: NaN},
+    {seed: Infinity},
+    {seed: undefined},
+    {seed: -Infinity},
+    {seed: [1, 1]},
+    {seed: 'test'},
+
+    {stitchTiles: {}},
+    {stitchTiles: NaN},
+    {stitchTiles: Infinity},
+    {stitchTiles: undefined},
+    {stitchTiles: -Infinity},
+    {stitchTiles: [1, 1]},
+    {stitchTiles: 'test'},
+    {stitchTiles: null},
+    {stitchTiles: []},
+    {stitchTiles: [10]},
+    {stitchTiles: 30},
+    {stitchTiles: false},
+    {stitchTiles: true},
+    {stitchTiles: '10'},
+    {stitchTiles: -1},
+
+    {type: {}},
+    {type: NaN},
+    {type: Infinity},
+    {type: undefined},
+    {type: -Infinity},
+    {type: [1, 1]},
+    {type: 'test'},
+    {type: null},
+    {type: []},
+    {type: [10]},
+    {type: 30},
+    {type: false},
+    {type: true},
+    {type: '10'},
+    {type: -1},
+  ]
+
+  // null and [] = 0 when parsed as number
+  const workingTestCases = [
+    {baseFrequency: null},
+    {baseFrequency: []},
+    {baseFrequency: [10]},
+    {baseFrequency: [10, 3]},
+    {baseFrequency: 30},
+    {baseFrequency: false},
+    {baseFrequency: true},
+    {baseFrequency: '10'},
+
+    {numOctaves: null},
+    {numOctaves: []},
+    {numOctaves: [10]},
+    {numOctaves: 30},
+    {numOctaves: false},
+    {numOctaves: true},
+    {numOctaves: '10'},
+
+    {seed: null},
+    {seed: []},
+    {seed: [10]},
+    {seed: 30},
+    {seed: false},
+    {seed: true},
+    {seed: '10'},
+    {seed: -1},
+
+    {stitchTiles: 'stitch'},
+    {stitchTiles: 'noStitch'},
+
+    {type: 'fractalNoise'},
+    {type: 'turbulence'},
+  ]
+
+  for (testCase of errorTestCases) {
+    const filterOptions = {...{name: 'turbulence'}, ...testCase};
+    assert_throws_js(TypeError, function() { ctx.beginLayer({filter: filterOptions}); });
+  }
+
+  for (testCase of workingTestCases) {
+    const filterOptions = {...{name: 'turbulence'}, ...testCase};
+    ctx.beginLayer({filter: filterOptions});
+    ctx.endLayer();
+  }
+  t.done();
+});
+done();
diff --git a/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.ctm.filter-expected.html b/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.ctm.filter-expected.html
new file mode 100644
index 0000000000..5fc1ac9acd
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.ctm.filter-expected.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>Canvas test: 2d.layer.ctm.filter</title>
+<h1>2d.layer.ctm.filter</h1>
+<p class="desc">Checks that parent transforms affect layer filters.</p>
+
+<svg xmlns="http://www.w3.org/2000/svg"
+      width="200" height="200"
+      color-interpolation-filters="sRGB">
+  <filter id="filter" x="-100%" y="-100%" width="300%" height="300%">
+    <feDropShadow dx="5" dy="5" stdDeviation="0" flood-color="grey" />
+  </filter>
+
+  <g filter="url(#filter)">
+    <g transform="translate(30, 90) scale(2) rotate(90)">
+      <rect x="-30" y="-5" width=60 height=10></rect>
+    </g>
+  </g>
+
+  <g transform="translate(80, 90) scale(2) rotate(90)">
+    <g filter="url(#filter)">
+      <rect x="-30" y="-5" width=60 height=10></rect>
+    </g>
+  </g>
+</svg>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.ctm.filter.html b/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.ctm.filter.html
new file mode 100644
index 0000000000..e5efc24bcc
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.ctm.filter.html
@@ -0,0 +1,32 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<link rel="match" href="2d.layer.ctm.filter-expected.html">
+<title>Canvas test: 2d.layer.ctm.filter</title>
+<h1>2d.layer.ctm.filter</h1>
+<p class="desc">Checks that parent transforms affect layer filters.</p>
+<canvas id="canvas" width="200" height="200">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = new OffscreenCanvas(200, 200);
+  const ctx = canvas.getContext('2d');
+
+  // Transforms inside the layer should not apply to the layer's filter.
+  ctx.beginLayer({filter: 'drop-shadow(5px 5px 0px grey)'});
+  ctx.translate(30, 90);
+  ctx.scale(2, 2);
+  ctx.rotate(Math.PI / 2);
+  ctx.fillRect(-30, -5, 60, 10);
+  ctx.endLayer();
+
+  // Transforms in the layer's parent should apply to the layer's filter.
+  ctx.translate(80, 90);
+  ctx.scale(2, 2);
+  ctx.rotate(Math.PI / 2);
+  ctx.beginLayer({filter: 'drop-shadow(5px 5px 0px grey)'});
+  ctx.fillRect(-30, -5, 60, 10);
+  ctx.endLayer();
+
+  const outputCanvas = document.getElementById("canvas");
+  outputCanvas.getContext('2d').drawImage(canvas, 0, 0);
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.ctm.filter.w.html b/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.ctm.filter.w.html
new file mode 100644
index 0000000000..760a65e2c8
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.ctm.filter.w.html
@@ -0,0 +1,46 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<html class="reftest-wait">
+<link rel="match" href="2d.layer.ctm.filter-expected.html">
+<title>Canvas test: 2d.layer.ctm.filter</title>
+<h1>2d.layer.ctm.filter</h1>
+<p class="desc">Checks that parent transforms affect layer filters.</p>
+<canvas id="canvas" width="200" height="200">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script id='myWorker' type='text/worker'>
+  self.onmessage = function(e) {
+    const canvas = new OffscreenCanvas(200, 200);
+    const ctx = canvas.getContext('2d');
+
+    // Transforms inside the layer should not apply to the layer's filter.
+    ctx.beginLayer({filter: 'drop-shadow(5px 5px 0px grey)'});
+    ctx.translate(30, 90);
+    ctx.scale(2, 2);
+    ctx.rotate(Math.PI / 2);
+    ctx.fillRect(-30, -5, 60, 10);
+    ctx.endLayer();
+
+    // Transforms in the layer's parent should apply to the layer's filter.
+    ctx.translate(80, 90);
+    ctx.scale(2, 2);
+    ctx.rotate(Math.PI / 2);
+    ctx.beginLayer({filter: 'drop-shadow(5px 5px 0px grey)'});
+    ctx.fillRect(-30, -5, 60, 10);
+    ctx.endLayer();
+
+    const bitmap = canvas.transferToImageBitmap();
+    self.postMessage(bitmap, bitmap);
+  };
+</script>
+<script>
+  const blob = new Blob([document.getElementById('myWorker').textContent]);
+  const worker = new Worker(URL.createObjectURL(blob));
+  worker.addEventListener('message', msg => {
+    const outputCtx = document.getElementById("canvas").getContext('2d');
+    outputCtx.drawImage(msg.data, 0, 0);
+    document.documentElement.classList.remove("reftest-wait");
+  });
+  worker.postMessage(null);
+</script>
+</html>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.ctm.getTransform.html b/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.ctm.getTransform.html
new file mode 100644
index 0000000000..b2306d95ac
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.ctm.getTransform.html
@@ -0,0 +1,32 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>OffscreenCanvas test: 2d.layer.ctm.getTransform</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+
+<h1>2d.layer.ctm.getTransform</h1>
+<p class="desc">Tests getTransform inside layers.</p>
+
+
+<script>
+var t = async_test("Tests getTransform inside layers.");
+var t_pass = t.done.bind(t);
+var t_fail = t.step_func(function(reason) {
+    throw reason;
+});
+t.step(function() {
+
+  var canvas = new OffscreenCanvas(100, 50);
+  var ctx = canvas.getContext('2d');
+
+  ctx.translate(10, 20);
+  ctx.beginLayer();
+  ctx.scale(2, 3);
+  const m = ctx.getTransform();
+  assert_array_equals([m.a, m.b, m.c, m.d, m.e, m.f], [2, 0, 0, 3, 10, 20]);
+  ctx.endLayer();
+  t.done();
+
+});
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.ctm.getTransform.worker.js b/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.ctm.getTransform.worker.js
new file mode 100644
index 0000000000..54b1fee5d0
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.ctm.getTransform.worker.js
@@ -0,0 +1,27 @@
+// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
+// OffscreenCanvas test in a worker:2d.layer.ctm.getTransform
+// Description:Tests getTransform inside layers.
+// Note:
+
+importScripts("/resources/testharness.js");
+importScripts("/html/canvas/resources/canvas-tests.js");
+
+var t = async_test("Tests getTransform inside layers.");
+var t_pass = t.done.bind(t);
+var t_fail = t.step_func(function(reason) {
+    throw reason;
+});
+t.step(function() {
+
+  var canvas = new OffscreenCanvas(100, 50);
+  var ctx = canvas.getContext('2d');
+
+  ctx.translate(10, 20);
+  ctx.beginLayer();
+  ctx.scale(2, 3);
+  const m = ctx.getTransform();
+  assert_array_equals([m.a, m.b, m.c, m.d, m.e, m.f], [2, 0, 0, 3, 10, 20]);
+  ctx.endLayer();
+  t.done();
+});
+done();
diff --git a/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.ctm.resetTransform-expected.html b/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.ctm.resetTransform-expected.html
new file mode 100644
index 0000000000..fd4c1746c7
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.ctm.resetTransform-expected.html
@@ -0,0 +1,19 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>Canvas test: 2d.layer.ctm.resetTransform</title>
+<h1>2d.layer.ctm.resetTransform</h1>
+<p class="desc">Tests resetTransform inside layers.</p>
+<canvas id="canvas" width="100" height="50">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = document.getElementById("canvas");
+  const ctx = canvas.getContext('2d');
+
+  ctx.fillStyle = 'blue';
+  ctx.fillRect(0, 0, 20, 20);
+
+  ctx.translate(40, 0);
+  ctx.fillStyle = 'green';
+  ctx.fillRect(0, 0, 20, 20);
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.ctm.resetTransform.html b/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.ctm.resetTransform.html
new file mode 100644
index 0000000000..9508b34044
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.ctm.resetTransform.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<link rel="match" href="2d.layer.ctm.resetTransform-expected.html">
+<title>Canvas test: 2d.layer.ctm.resetTransform</title>
+<h1>2d.layer.ctm.resetTransform</h1>
+<p class="desc">Tests resetTransform inside layers.</p>
+<canvas id="canvas" width="100" height="50">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = new OffscreenCanvas(100, 50);
+  const ctx = canvas.getContext('2d');
+
+  ctx.translate(40, 0);
+
+  ctx.beginLayer();
+  ctx.rotate(2);
+  ctx.beginLayer();
+  ctx.scale(5, 6);
+  ctx.resetTransform();
+  ctx.fillStyle = 'blue';
+  ctx.fillRect(0, 0, 20, 20);
+  ctx.endLayer();
+  ctx.endLayer();
+
+  ctx.fillStyle = 'green';
+  ctx.fillRect(0, 0, 20, 20);
+
+  const outputCanvas = document.getElementById("canvas");
+  outputCanvas.getContext('2d').drawImage(canvas, 0, 0);
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.ctm.resetTransform.w.html b/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.ctm.resetTransform.w.html
new file mode 100644
index 0000000000..7bf63e1473
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.ctm.resetTransform.w.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<html class="reftest-wait">
+<link rel="match" href="2d.layer.ctm.resetTransform-expected.html">
+<title>Canvas test: 2d.layer.ctm.resetTransform</title>
+<h1>2d.layer.ctm.resetTransform</h1>
+<p class="desc">Tests resetTransform inside layers.</p>
+<canvas id="canvas" width="100" height="50">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script id='myWorker' type='text/worker'>
+  self.onmessage = function(e) {
+    const canvas = new OffscreenCanvas(100, 50);
+    const ctx = canvas.getContext('2d');
+
+    ctx.translate(40, 0);
+
+    ctx.beginLayer();
+    ctx.rotate(2);
+    ctx.beginLayer();
+    ctx.scale(5, 6);
+    ctx.resetTransform();
+    ctx.fillStyle = 'blue';
+    ctx.fillRect(0, 0, 20, 20);
+    ctx.endLayer();
+    ctx.endLayer();
+
+    ctx.fillStyle = 'green';
+    ctx.fillRect(0, 0, 20, 20);
+
+    const bitmap = canvas.transferToImageBitmap();
+    self.postMessage(bitmap, bitmap);
+  };
+</script>
+<script>
+  const blob = new Blob([document.getElementById('myWorker').textContent]);
+  const worker = new Worker(URL.createObjectURL(blob));
+  worker.addEventListener('message', msg => {
+    const outputCtx = document.getElementById("canvas").getContext('2d');
+    outputCtx.drawImage(msg.data, 0, 0);
+    document.documentElement.classList.remove("reftest-wait");
+  });
+  worker.postMessage(null);
+</script>
+</html>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.ctm.setTransform-expected.html b/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.ctm.setTransform-expected.html
new file mode 100644
index 0000000000..45a3d095e1
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.ctm.setTransform-expected.html
@@ -0,0 +1,20 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>Canvas test: 2d.layer.ctm.setTransform</title>
+<h1>2d.layer.ctm.setTransform</h1>
+<p class="desc">Tests setTransform inside layers.</p>
+<canvas id="canvas" width="100" height="50">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = document.getElementById("canvas");
+  const ctx = canvas.getContext('2d');
+
+  ctx.translate(80, 0);
+  ctx.fillStyle = 'green';
+  ctx.fillRect(0, 0, 20, 20);
+
+  ctx.setTransform(4, 0, 0, 2, 20, 10);
+  ctx.fillStyle = 'blue';
+  ctx.fillRect(0, 0, 10, 10);
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.ctm.setTransform.html b/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.ctm.setTransform.html
new file mode 100644
index 0000000000..91034943b6
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.ctm.setTransform.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<link rel="match" href="2d.layer.ctm.setTransform-expected.html">
+<title>Canvas test: 2d.layer.ctm.setTransform</title>
+<h1>2d.layer.ctm.setTransform</h1>
+<p class="desc">Tests setTransform inside layers.</p>
+<canvas id="canvas" width="100" height="50">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = new OffscreenCanvas(100, 50);
+  const ctx = canvas.getContext('2d');
+
+  ctx.translate(80, 0);
+
+  ctx.beginLayer();
+  ctx.rotate(2);
+  ctx.beginLayer();
+  ctx.scale(5, 6);
+  ctx.setTransform(4, 0, 0, 2, 20, 10);
+  ctx.fillStyle = 'blue';
+  ctx.fillRect(0, 0, 10, 10);
+  ctx.endLayer();
+  ctx.endLayer();
+
+  ctx.fillStyle = 'green';
+  ctx.fillRect(0, 0, 20, 20);
+
+  const outputCanvas = document.getElementById("canvas");
+  outputCanvas.getContext('2d').drawImage(canvas, 0, 0);
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.ctm.setTransform.w.html b/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.ctm.setTransform.w.html
new file mode 100644
index 0000000000..8b1ea1ce51
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.ctm.setTransform.w.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<html class="reftest-wait">
+<link rel="match" href="2d.layer.ctm.setTransform-expected.html">
+<title>Canvas test: 2d.layer.ctm.setTransform</title>
+<h1>2d.layer.ctm.setTransform</h1>
+<p class="desc">Tests setTransform inside layers.</p>
+<canvas id="canvas" width="100" height="50">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script id='myWorker' type='text/worker'>
+  self.onmessage = function(e) {
+    const canvas = new OffscreenCanvas(100, 50);
+    const ctx = canvas.getContext('2d');
+
+    ctx.translate(80, 0);
+
+    ctx.beginLayer();
+    ctx.rotate(2);
+    ctx.beginLayer();
+    ctx.scale(5, 6);
+    ctx.setTransform(4, 0, 0, 2, 20, 10);
+    ctx.fillStyle = 'blue';
+    ctx.fillRect(0, 0, 10, 10);
+    ctx.endLayer();
+    ctx.endLayer();
+
+    ctx.fillStyle = 'green';
+    ctx.fillRect(0, 0, 20, 20);
+
+    const bitmap = canvas.transferToImageBitmap();
+    self.postMessage(bitmap, bitmap);
+  };
+</script>
+<script>
+  const blob = new Blob([document.getElementById('myWorker').textContent]);
+  const worker = new Worker(URL.createObjectURL(blob));
+  worker.addEventListener('message', msg => {
+    const outputCtx = document.getElementById("canvas").getContext('2d');
+    outputCtx.drawImage(msg.data, 0, 0);
+    document.documentElement.classList.remove("reftest-wait");
+  });
+  worker.postMessage(null);
+</script>
+</html>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.ctm.shadow-in-transformed-layer-expected.html b/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.ctm.shadow-in-transformed-layer-expected.html
new file mode 100644
index 0000000000..312ca19b4c
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.ctm.shadow-in-transformed-layer-expected.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>Canvas test: 2d.layer.ctm.shadow-in-transformed-layer</title>
+<h1>2d.layer.ctm.shadow-in-transformed-layer</h1>
+<p class="desc">Check shadows inside of a transformed layer.</p>
+<canvas id="canvas" width="200" height="200">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = document.getElementById("canvas");
+  const ctx = canvas.getContext('2d');
+
+  ctx.translate(80, 90);
+  ctx.scale(2, 2);
+  ctx.rotate(Math.PI / 2);
+
+  ctx.shadowOffsetX = 10;
+  ctx.shadowOffsetY = 10;
+  ctx.shadowColor = 'grey';
+  ctx.fillRect(-30, -5, 60, 10);
+
+  const canvas2 = new OffscreenCanvas(100, 100);
+  const ctx2 = canvas2.getContext('2d');
+  ctx2.fillStyle = 'blue';
+  ctx2.fillRect(0, 0, 40, 10);
+  ctx.drawImage(canvas2, -30, -30);
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.ctm.shadow-in-transformed-layer.html b/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.ctm.shadow-in-transformed-layer.html
new file mode 100644
index 0000000000..59305076f0
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.ctm.shadow-in-transformed-layer.html
@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<link rel="match" href="2d.layer.ctm.shadow-in-transformed-layer-expected.html">
+<title>Canvas test: 2d.layer.ctm.shadow-in-transformed-layer</title>
+<h1>2d.layer.ctm.shadow-in-transformed-layer</h1>
+<p class="desc">Check shadows inside of a transformed layer.</p>
+<canvas id="canvas" width="200" height="200">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = new OffscreenCanvas(200, 200);
+  const ctx = canvas.getContext('2d');
+
+  ctx.translate(80, 90);
+  ctx.scale(2, 2);
+  ctx.rotate(Math.PI / 2);
+
+  ctx.beginLayer();
+  ctx.shadowOffsetX = 10;
+  ctx.shadowOffsetY = 10;
+  ctx.shadowColor = 'grey';
+  ctx.fillRect(-30, -5, 60, 10);
+
+  const canvas2 = new OffscreenCanvas(100, 100);
+  const ctx2 = canvas2.getContext('2d');
+  ctx2.fillStyle = 'blue';
+  ctx2.fillRect(0, 0, 40, 10);
+  ctx.drawImage(canvas2, -30, -30);
+
+  ctx.endLayer();
+
+  const outputCanvas = document.getElementById("canvas");
+  outputCanvas.getContext('2d').drawImage(canvas, 0, 0);
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.ctm.shadow-in-transformed-layer.w.html b/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.ctm.shadow-in-transformed-layer.w.html
new file mode 100644
index 0000000000..486a028335
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.ctm.shadow-in-transformed-layer.w.html
@@ -0,0 +1,48 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<html class="reftest-wait">
+<link rel="match" href="2d.layer.ctm.shadow-in-transformed-layer-expected.html">
+<title>Canvas test: 2d.layer.ctm.shadow-in-transformed-layer</title>
+<h1>2d.layer.ctm.shadow-in-transformed-layer</h1>
+<p class="desc">Check shadows inside of a transformed layer.</p>
+<canvas id="canvas" width="200" height="200">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script id='myWorker' type='text/worker'>
+  self.onmessage = function(e) {
+    const canvas = new OffscreenCanvas(200, 200);
+    const ctx = canvas.getContext('2d');
+
+    ctx.translate(80, 90);
+    ctx.scale(2, 2);
+    ctx.rotate(Math.PI / 2);
+
+    ctx.beginLayer();
+    ctx.shadowOffsetX = 10;
+    ctx.shadowOffsetY = 10;
+    ctx.shadowColor = 'grey';
+    ctx.fillRect(-30, -5, 60, 10);
+
+    const canvas2 = new OffscreenCanvas(100, 100);
+    const ctx2 = canvas2.getContext('2d');
+    ctx2.fillStyle = 'blue';
+    ctx2.fillRect(0, 0, 40, 10);
+    ctx.drawImage(canvas2, -30, -30);
+
+    ctx.endLayer();
+
+    const bitmap = canvas.transferToImageBitmap();
+    self.postMessage(bitmap, bitmap);
+  };
+</script>
+<script>
+  const blob = new Blob([document.getElementById('myWorker').textContent]);
+  const worker = new Worker(URL.createObjectURL(blob));
+  worker.addEventListener('message', msg => {
+    const outputCtx = document.getElementById("canvas").getContext('2d');
+    outputCtx.drawImage(msg.data, 0, 0);
+    document.documentElement.classList.remove("reftest-wait");
+  });
+  worker.postMessage(null);
+</script>
+</html>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.drawImage-expected.html b/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.drawImage-expected.html
new file mode 100644
index 0000000000..26f6e75214
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.drawImage-expected.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>Canvas test: 2d.layer.drawImage</title>
+<h1>2d.layer.drawImage</h1>
+<p class="desc">Checks that drawImage writes the image to the layer and not the parent directly.</p>
+<canvas id="canvas" width="200" height="200">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = document.getElementById("canvas");
+  const ctx = canvas.getContext('2d');
+
+  ctx.fillStyle = 'skyblue';
+  ctx.fillRect(0, 0, 100, 100);
+
+  ctx.beginLayer({filter: {name: 'dropShadow', dx: -10, dy: -10,
+    stdDeviation: 0, floodColor: 'navy'}});
+
+  ctx.fillStyle = 'maroon';
+  ctx.fillRect(20, 20, 50, 50);
+
+  ctx.globalCompositeOperation = 'xor';
+
+  // Should xor only with the layer content, not the parents'.
+  ctx.fillStyle = 'pink';
+  ctx.fillRect(40, 40, 50, 50);
+
+  ctx.endLayer();
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.drawImage.html b/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.drawImage.html
new file mode 100644
index 0000000000..37718f6f2c
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.drawImage.html
@@ -0,0 +1,36 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<link rel="match" href="2d.layer.drawImage-expected.html">
+<title>Canvas test: 2d.layer.drawImage</title>
+<h1>2d.layer.drawImage</h1>
+<p class="desc">Checks that drawImage writes the image to the layer and not the parent directly.</p>
+<canvas id="canvas" width="200" height="200">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = new OffscreenCanvas(200, 200);
+  const ctx = canvas.getContext('2d');
+
+  ctx.fillStyle = 'skyblue';
+  ctx.fillRect(0, 0, 100, 100);
+
+  ctx.beginLayer({filter: {name: 'dropShadow', dx: -10, dy: -10,
+    stdDeviation: 0, floodColor: 'navy'}});
+
+  ctx.fillStyle = 'maroon';
+  ctx.fillRect(20, 20, 50, 50);
+
+  ctx.globalCompositeOperation = 'xor';
+
+  // The image should xor only with the layer content, not the parents'.
+  const canvas_image = new OffscreenCanvas(200,200);
+  const ctx_image = canvas_image.getContext("2d");
+  ctx_image.fillStyle = 'pink';
+  ctx_image.fillRect(40, 40, 50, 50);
+  ctx.drawImage(canvas_image, 0, 0);
+
+  ctx.endLayer();
+
+  const outputCanvas = document.getElementById("canvas");
+  outputCanvas.getContext('2d').drawImage(canvas, 0, 0);
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.drawImage.w.html b/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.drawImage.w.html
new file mode 100644
index 0000000000..78a235597d
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.drawImage.w.html
@@ -0,0 +1,50 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<html class="reftest-wait">
+<link rel="match" href="2d.layer.drawImage-expected.html">
+<title>Canvas test: 2d.layer.drawImage</title>
+<h1>2d.layer.drawImage</h1>
+<p class="desc">Checks that drawImage writes the image to the layer and not the parent directly.</p>
+<canvas id="canvas" width="200" height="200">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script id='myWorker' type='text/worker'>
+  self.onmessage = function(e) {
+    const canvas = new OffscreenCanvas(200, 200);
+    const ctx = canvas.getContext('2d');
+
+    ctx.fillStyle = 'skyblue';
+    ctx.fillRect(0, 0, 100, 100);
+
+    ctx.beginLayer({filter: {name: 'dropShadow', dx: -10, dy: -10,
+      stdDeviation: 0, floodColor: 'navy'}});
+
+    ctx.fillStyle = 'maroon';
+    ctx.fillRect(20, 20, 50, 50);
+
+    ctx.globalCompositeOperation = 'xor';
+
+    // The image should xor only with the layer content, not the parents'.
+    const canvas_image = new OffscreenCanvas(200,200);
+    const ctx_image = canvas_image.getContext("2d");
+    ctx_image.fillStyle = 'pink';
+    ctx_image.fillRect(40, 40, 50, 50);
+    ctx.drawImage(canvas_image, 0, 0);
+
+    ctx.endLayer();
+
+    const bitmap = canvas.transferToImageBitmap();
+    self.postMessage(bitmap, bitmap);
+  };
+</script>
+<script>
+  const blob = new Blob([document.getElementById('myWorker').textContent]);
+  const worker = new Worker(URL.createObjectURL(blob));
+  worker.addEventListener('message', msg => {
+    const outputCtx = document.getElementById("canvas").getContext('2d');
+    outputCtx.drawImage(msg.data, 0, 0);
+    document.documentElement.classList.remove("reftest-wait");
+  });
+  worker.postMessage(null);
+</script>
+</html>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.global-states.filter.alpha.blending.html b/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.global-states.filter.alpha.blending.html
index be6f962b33..0e48cb49f7 100644
--- a/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.global-states.filter.alpha.blending.html
+++ b/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.global-states.filter.alpha.blending.html
@@ -1,6 +1,7 @@
 <!DOCTYPE html>
 <!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
 <link rel="match" href="2d.layer.global-states.filter.alpha.blending-expected.html">
+<meta name=fuzzy content="maxDifference=0-1; totalPixels=0-2453">
 <title>Canvas test: 2d.layer.global-states.filter.alpha.blending</title>
 <h1>2d.layer.global-states.filter.alpha.blending</h1>
 <p class="desc">Checks that layers with filters correctly use global render states.</p>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.global-states.filter.alpha.blending.w.html b/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.global-states.filter.alpha.blending.w.html
index 2b53ad7c1e..3887ed4485 100644
--- a/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.global-states.filter.alpha.blending.w.html
+++ b/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.global-states.filter.alpha.blending.w.html
@@ -2,6 +2,7 @@
 <!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
 <html class="reftest-wait">
 <link rel="match" href="2d.layer.global-states.filter.alpha.blending-expected.html">
+<meta name=fuzzy content="maxDifference=0-1; totalPixels=0-2453">
 <title>Canvas test: 2d.layer.global-states.filter.alpha.blending</title>
 <h1>2d.layer.global-states.filter.alpha.blending</h1>
 <p class="desc">Checks that layers with filters correctly use global render states.</p>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.global-states.filter.alpha.composite.html b/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.global-states.filter.alpha.composite.html
index 087fea88af..1a9bc8b733 100644
--- a/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.global-states.filter.alpha.composite.html
+++ b/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.global-states.filter.alpha.composite.html
@@ -1,6 +1,7 @@
 <!DOCTYPE html>
 <!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
 <link rel="match" href="2d.layer.global-states.filter.alpha.composite-expected.html">
+<meta name=fuzzy content="maxDifference=0-1; totalPixels=0-5204">
 <title>Canvas test: 2d.layer.global-states.filter.alpha.composite</title>
 <h1>2d.layer.global-states.filter.alpha.composite</h1>
 <p class="desc">Checks that layers with filters correctly use global render states.</p>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.global-states.filter.alpha.composite.w.html b/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.global-states.filter.alpha.composite.w.html
index 6aa83a3278..5c90fe95aa 100644
--- a/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.global-states.filter.alpha.composite.w.html
+++ b/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.global-states.filter.alpha.composite.w.html
@@ -2,6 +2,7 @@
 <!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
 <html class="reftest-wait">
 <link rel="match" href="2d.layer.global-states.filter.alpha.composite-expected.html">
+<meta name=fuzzy content="maxDifference=0-1; totalPixels=0-5204">
 <title>Canvas test: 2d.layer.global-states.filter.alpha.composite</title>
 <h1>2d.layer.global-states.filter.alpha.composite</h1>
 <p class="desc">Checks that layers with filters correctly use global render states.</p>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.global-states.filter.alpha.html b/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.global-states.filter.alpha.html
index f1d631c25c..f64e8925f0 100644
--- a/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.global-states.filter.alpha.html
+++ b/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.global-states.filter.alpha.html
@@ -1,6 +1,7 @@
 <!DOCTYPE html>
 <!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
 <link rel="match" href="2d.layer.global-states.filter.alpha-expected.html">
+<meta name=fuzzy content="maxDifference=0-2; totalPixels=0-6766">
 <title>Canvas test: 2d.layer.global-states.filter.alpha</title>
 <h1>2d.layer.global-states.filter.alpha</h1>
 <p class="desc">Checks that layers with filters correctly use global render states.</p>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.global-states.filter.alpha.shadow.html b/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.global-states.filter.alpha.shadow.html
index 2548c21181..5e8911ee17 100644
--- a/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.global-states.filter.alpha.shadow.html
+++ b/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.global-states.filter.alpha.shadow.html
@@ -1,6 +1,7 @@
 <!DOCTYPE html>
 <!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
 <link rel="match" href="2d.layer.global-states.filter.alpha.shadow-expected.html">
+<meta name=fuzzy content="maxDifference=0-2; totalPixels=0-6311">
 <title>Canvas test: 2d.layer.global-states.filter.alpha.shadow</title>
 <h1>2d.layer.global-states.filter.alpha.shadow</h1>
 <p class="desc">Checks that layers with filters correctly use global render states.</p>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.global-states.filter.alpha.shadow.w.html b/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.global-states.filter.alpha.shadow.w.html
index 5e1494422e..b3be7e1ac8 100644
--- a/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.global-states.filter.alpha.shadow.w.html
+++ b/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.global-states.filter.alpha.shadow.w.html
@@ -2,6 +2,7 @@
 <!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
 <html class="reftest-wait">
 <link rel="match" href="2d.layer.global-states.filter.alpha.shadow-expected.html">
+<meta name=fuzzy content="maxDifference=0-2; totalPixels=0-6311">
 <title>Canvas test: 2d.layer.global-states.filter.alpha.shadow</title>
 <h1>2d.layer.global-states.filter.alpha.shadow</h1>
 <p class="desc">Checks that layers with filters correctly use global render states.</p>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.global-states.filter.alpha.w.html b/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.global-states.filter.alpha.w.html
index e75d668ad5..21e55f856c 100644
--- a/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.global-states.filter.alpha.w.html
+++ b/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.global-states.filter.alpha.w.html
@@ -2,6 +2,7 @@
 <!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
 <html class="reftest-wait">
 <link rel="match" href="2d.layer.global-states.filter.alpha-expected.html">
+<meta name=fuzzy content="maxDifference=0-2; totalPixels=0-6766">
 <title>Canvas test: 2d.layer.global-states.filter.alpha</title>
 <h1>2d.layer.global-states.filter.alpha</h1>
 <p class="desc">Checks that layers with filters correctly use global render states.</p>
diff --git a/testing/web-platform/tests/html/canvas/tools/gentestutilsunion.py b/testing/web-platform/tests/html/canvas/tools/gentestutilsunion.py
index cf141f2f07..d7042810be 100644
--- a/testing/web-platform/tests/html/canvas/tools/gentestutilsunion.py
+++ b/testing/web-platform/tests/html/canvas/tools/gentestutilsunion.py
@@ -28,7 +28,7 @@
 #
 # * Test the tests, add new ones to Git, remove deleted ones from Git, etc.
 
-from typing import Any, List, Mapping, Optional, Set, Tuple
+from typing import Any, DefaultDict, List, Mapping, Optional, Set, Tuple
 
 import re
 import collections
@@ -184,6 +184,10 @@ def _remove_extra_newlines(text: str) -> str:
     return text
 
 def _expand_test_code(code: str) -> str:
+    code = re.sub(r' @moz-todo', '', code)
+
+    code = re.sub(r'@moz-UniversalBrowserRead;', '', code)
+
     code = _remove_extra_newlines(code)
 
     # Unroll expressions with a cross-product-style parameter expansion.
@@ -202,11 +206,13 @@ def _expand_test_code(code: str) -> str:
     code = re.sub(r'@assert pixel (\d+,\d+) ==~ (\d+,\d+,\d+,\d+) \+/- (\d+);',
                   r'_assertPixelApprox(canvas, \1, \2, \3);', code)
 
-    code = re.sub(r'@assert throws (\S+_ERR) (.*);',
-                  r'assert_throws_dom("\1", function() { \2; });', code)
+    code = re.sub(r'@assert throws (\S+_ERR) (.*?);$',
+                  r'assert_throws_dom("\1", function() { \2; });', code,
+                  flags=re.MULTILINE | re.DOTALL)
 
-    code = re.sub(r'@assert throws (\S+Error) (.*);',
-                  r'assert_throws_js(\1, function() { \2; });', code)
+    code = re.sub(r'@assert throws (\S+Error) (.*?);$',
+                  r'assert_throws_js(\1, function() { \2; });', code,
+                  flags=re.MULTILINE | re.DOTALL)
 
     code = re.sub(
         r'@assert (.*) === (.*);', lambda m: '_assertSame(%s, %s, "%s", "%s");'
@@ -226,10 +232,6 @@ def _expand_test_code(code: str) -> str:
         r'@assert (.*);', lambda m: '_assert(%s, "%s");' % (m.group(
             1), _escapeJS(m.group(1))), code)
 
-    code = re.sub(r' @moz-todo', '', code)
-
-    code = re.sub(r'@moz-UniversalBrowserRead;', '', code)
-
     assert ('@' not in code)
 
     return code
@@ -376,45 +378,50 @@ def _write_testharness_test(jinja_env: jinja2.Environment,
             'utf-8')
 
 
+def _generate_expected_image(expected: str, name: str, sub_dir: str,
+                             enabled_canvas_types: Set[CanvasType],
+                             html_canvas_cfg: TestConfig,
+                             offscreen_canvas_cfg: TestConfig) -> str:
+    """Creates a reference image using Cairo and returns the file location."""
+    if expected == 'green':
+        return '/images/green-100x50.png'
+    if expected == 'clear':
+        return '/images/clear-100x50.png'
+    if ';' in expected:
+        print('Found semicolon in %s' % name)
+    expected = re.sub(
+        r'^size (\d+) (\d+)',
+        r'surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, \1, \2)'
+        r'\ncr = cairo.Context(surface)', expected)
+
+    if CanvasType.HTML_CANVAS in enabled_canvas_types:
+        expected_canvas = (
+            expected + "\nsurface.write_to_png('%s.png')\n" %
+            os.path.join(html_canvas_cfg.image_out_dir, sub_dir, name))
+        eval(compile(expected_canvas, '<test %s>' % name, 'exec'), {},
+             {'cairo': cairo})
+
+    if {CanvasType.OFFSCREEN_CANVAS, CanvasType.WORKER} & enabled_canvas_types:
+        expected_offscreen = (
+            expected + "\nsurface.write_to_png('%s.png')\n" %
+            os.path.join(offscreen_canvas_cfg.image_out_dir, sub_dir, name))
+        eval(compile(expected_offscreen, '<test %s>' % name, 'exec'), {},
+             {'cairo': cairo})
+
+    return '%s.png' % name
+
+
 def _generate_test(test: Mapping[str, Any], jinja_env: jinja2.Environment,
-                   sub_dir: str, enabled_tests: Set[CanvasType],
+                   name_to_sub_dir: Mapping[str, str],
+                   used_tests: DefaultDict[str, Set[CanvasType]],
                    html_canvas_cfg: TestConfig,
                    offscreen_canvas_cfg: TestConfig) -> None:
     _validate_test(test)
 
     name = test['name']
 
-    expected_img = None
-    if 'expected' in test and test['expected'] is not None:
-        expected = test['expected']
-        if expected == 'green':
-            expected_img = '/images/green-100x50.png'
-        elif expected == 'clear':
-            expected_img = '/images/clear-100x50.png'
-        else:
-            if ';' in expected:
-                print('Found semicolon in %s' % name)
-            expected = re.sub(
-                r'^size (\d+) (\d+)',
-                r'surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, \1, \2)'
-                r'\ncr = cairo.Context(surface)', expected)
-
-            if CanvasType.HTML_CANVAS in enabled_tests:
-                expected_canvas = (
-                    expected + "\nsurface.write_to_png('%s.png')\n" %
-                    os.path.join(html_canvas_cfg.image_out_dir, sub_dir, name))
-                eval(compile(expected_canvas, '<test %s>' % name, 'exec'), {},
-                    {'cairo': cairo})
-
-            if {CanvasType.OFFSCREEN_CANVAS, CanvasType.WORKER} & enabled_tests:
-                expected_offscreen = (
-                    expected +
-                    "\nsurface.write_to_png('%s.png')\n" % os.path.join(
-                        offscreen_canvas_cfg.image_out_dir, sub_dir, name))
-                eval(compile(expected_offscreen, '<test %s>' % name, 'exec'),
-                     {}, {'cairo': cairo})
-
-            expected_img = '%s.png' % name
+    sub_dir = _get_test_sub_dir(name, name_to_sub_dir)
+    enabled_canvas_types = _get_enabled_canvas_types(test)
 
     # Defaults:
     params = {
@@ -423,11 +430,29 @@ def _generate_test(test: Mapping[str, Any], jinja_env: jinja2.Environment,
     }
 
     params.update(test)
+
+    # Render parameters used in the test name.
+    name = jinja_env.from_string(name).render(params)
+    print('\r(%s)' % name, ' ' * 32, '\t')
+
+    expected_img = None
+    if 'expected' in test and test['expected'] is not None:
+        expected_img = _generate_expected_image(test['expected'], name,
+                                                sub_dir, enabled_canvas_types,
+                                                html_canvas_cfg,
+                                                offscreen_canvas_cfg)
+
     params.update({
         'code': _expand_test_code(test['code']),
         'expected_img': expected_img
     })
 
+    already_tested = used_tests[name].intersection(enabled_canvas_types)
+    if already_tested:
+        raise InvalidTestDefinitionError(
+            f'Test {name} is defined twice for types {already_tested}')
+    used_tests[name].update(enabled_canvas_types)
+
     canvas_path = os.path.join(html_canvas_cfg.out_dir, sub_dir, name)
     offscreen_path = os.path.join(offscreen_canvas_cfg.out_dir, sub_dir, name)
     if 'manual' in test:
@@ -435,11 +460,55 @@ def _generate_test(test: Mapping[str, Any], jinja_env: jinja2.Environment,
         offscreen_path += '-manual'
 
     if 'reference' in test or 'html_reference' in test:
-        _write_reference_test(jinja_env, params, enabled_tests,
+        _write_reference_test(jinja_env, params, enabled_canvas_types,
                               canvas_path, offscreen_path)
     else:
-        _write_testharness_test(jinja_env, params, enabled_tests, canvas_path,
-                                offscreen_path)
+        _write_testharness_test(jinja_env, params, enabled_canvas_types,
+                                canvas_path, offscreen_path)
+
+
+def _recursive_expand_variant_matrix(test_list: List[Mapping[str, Any]],
+                                     variant_matrix: List[Mapping[str, Any]],
+                                     current_selection: List[Tuple[str, Any]],
+                                     original_test: Mapping[str, Any]):
+    if len(current_selection) == len(variant_matrix):
+        # Selection for each variant is done, so add a new test to test_list.
+        test = original_test.copy()
+        variant_name_list = []
+        should_append_variant_names = original_test.get(
+            'append_variants_to_name', True)
+        for variant_name, variant_params in current_selection:
+            variant_name_list.append(variant_name)
+            # Append variant name. Variant names starting with '_' are
+            # not appended, which is useful to create variants with the same
+            # name in different folders (element vs. offscreen).
+            if (should_append_variant_names
+                    and not variant_name.startswith('_')):
+                test['name'] += '.' + variant_name
+            test.update(variant_params)
+            # Expose variant names as a list so they can be used from the yaml
+            # files, which helps with better naming of tests.
+            test.update({'variant_names': variant_name_list})
+        test_list.append(test)
+    else:
+        # Continue the recursion with each possible selection for the current
+        # variant.
+        variant = variant_matrix[len(current_selection)]
+        for variant_options in variant.items():
+            current_selection.append(variant_options)
+            _recursive_expand_variant_matrix(test_list, variant_matrix,
+                                             current_selection, original_test)
+            current_selection.pop()
+
+
+def _expand_variant_matrix(
+        variant_matrix: List[Mapping[str, Any]],
+        original_test: Mapping[str, Any]) -> List[Mapping[str, Any]]:
+    current_selection = []
+    matrix_tests = []
+    _recursive_expand_variant_matrix(matrix_tests, variant_matrix,
+                                     current_selection, original_test)
+    return matrix_tests
 
 
 def genTestUtils_union(NAME2DIRFILE: str) -> None:
@@ -495,41 +564,25 @@ def genTestUtils_union(NAME2DIRFILE: str) -> None:
             pass  # Ignore if it already exists,
 
     used_tests = collections.defaultdict(set)
-    for original_test in tests:
-        variants = original_test.get('variants', {'': dict()})
-        for variant_name, variant_params in variants.items():
-            test = original_test.copy()
-            if variant_name or variant_params:
-                # Append variant name. Variant names starting with '_' are
-                # not appended, which is useful to create variants with the same
-                # name in different folders (element vs. offscreen).
-                if not variant_name.startswith('_'):
-                    test['name'] += '.' + variant_name
-                test.update(variant_params)
-
-            name = test['name']
-            print('\r(%s)' % name, ' ' * 32, '\t')
-
-            enabled_canvas_types = _get_enabled_canvas_types(test)
-
-            already_tested = used_tests[name].intersection(
-                enabled_canvas_types)
-            if already_tested:
-                raise InvalidTestDefinitionError(
-                    f'Test {name} is defined twice for types {already_tested}')
-            used_tests[name].update(enabled_canvas_types)
-
-            sub_dir = _get_test_sub_dir(name, name_to_sub_dir)
-            _generate_test(
-                test,
-                jinja_env,
-                sub_dir,
-                enabled_canvas_types,
-                html_canvas_cfg=TestConfig(
-                    out_dir=CANVASOUTPUTDIR,
-                    image_out_dir=CANVASIMAGEOUTPUTDIR),
-                offscreen_canvas_cfg=TestConfig(
-                    out_dir=OFFSCREENCANVASOUTPUTDIR,
-                    image_out_dir=OFFSCREENCANVASIMAGEOUTPUTDIR))
+    for test in tests:
+        if 'variant_matrix' in test:
+            variants = _expand_variant_matrix(test['variant_matrix'], test)
+        elif 'variants' in test:
+            variant_matrix = [test['variants']]
+            variants = _expand_variant_matrix(variant_matrix, test)
+        else:
+            variants = [test]
+
+        for variant in variants:
+            _generate_test(variant,
+                           jinja_env,
+                           name_to_sub_dir,
+                           used_tests,
+                           html_canvas_cfg=TestConfig(
+                               out_dir=CANVASOUTPUTDIR,
+                               image_out_dir=CANVASIMAGEOUTPUTDIR),
+                           offscreen_canvas_cfg=TestConfig(
+                               out_dir=OFFSCREENCANVASOUTPUTDIR,
+                               image_out_dir=OFFSCREENCANVASIMAGEOUTPUTDIR))
 
     print()
diff --git a/testing/web-platform/tests/html/canvas/tools/name2dir-offscreen.yaml b/testing/web-platform/tests/html/canvas/tools/name2dir-offscreen.yaml
index c52acb793b..6e4b3f42b2 100644
--- a/testing/web-platform/tests/html/canvas/tools/name2dir-offscreen.yaml
+++ b/testing/web-platform/tests/html/canvas/tools/name2dir-offscreen.yaml
@@ -19,4 +19,4 @@
 2d.missingargs:                       "conformance-requirements"
 2d.voidreturn:                        "conformance-requirements"
 2d.canvas.host:                       "canvas-host"
-2d.canvas.context:                    "canvas-context"
\ No newline at end of file
+2d.canvas.context:                    "canvas-context"
diff --git a/testing/web-platform/tests/html/canvas/tools/yaml-new/drawing-images-to-the-canvas.yaml b/testing/web-platform/tests/html/canvas/tools/yaml-new/drawing-images-to-the-canvas.yaml
index 93c556288d..09e9e00186 100644
--- a/testing/web-platform/tests/html/canvas/tools/yaml-new/drawing-images-to-the-canvas.yaml
+++ b/testing/web-platform/tests/html/canvas/tools/yaml-new/drawing-images-to-the-canvas.yaml
@@ -638,3 +638,11 @@
     @nonfinite ctx.drawImage(<bitmap>, <0 Infinity -Infinity NaN>, <0 Infinity -Infinity NaN>, <100 Infinity -Infinity NaN>, <50 Infinity -Infinity NaN>, <0 Infinity -Infinity NaN>, <0 Infinity -Infinity NaN>, <100 Infinity -Infinity NaN>, <50 Infinity -Infinity NaN>);
     @assert pixel 50,25 == 0,255,0,255;
   expected: green
+
+- name: 2d.drawImage.detachedcanvas
+  desc: drawImage with detached OffscreenCanvas as the source should throw exception
+  canvasType: ['HTMLCanvas']
+  code: |
+    var canvas2 = new OffscreenCanvas(80, 80);
+    (new MessageChannel()).port1.postMessage(canvas2, [canvas2]);
+    @assert throws INVALID_STATE_ERR ctx.drawImage(canvas2, 0, 0);
diff --git a/testing/web-platform/tests/html/canvas/tools/yaml-new/filters.yaml b/testing/web-platform/tests/html/canvas/tools/yaml-new/filters.yaml
index 01c83a33e2..f327b9fe94 100644
--- a/testing/web-platform/tests/html/canvas/tools/yaml-new/filters.yaml
+++ b/testing/web-platform/tests/html/canvas/tools/yaml-new/filters.yaml
@@ -89,51 +89,102 @@
     ctx.filter = 'this string is not a filter and should do nothing';
     @assert ctx.filter.toString() == '[object CanvasFilter]';
 
-- name: 2d.filter.canvasFilterObject.blur.exceptions.tentative
-  desc: Test exceptions on CanvasFilter() blur.object
+- name: 2d.filter.{{ variant_names[0] }}.blur.exceptions{{ tentative }}
+  desc: Test exceptions on gaussianBlur filter
   code: |
-    @assert throws TypeError ctx.filter = new CanvasFilter({name: 'gaussianBlur'});
-    @assert throws TypeError ctx.filter = new CanvasFilter({name: 'gaussianBlur', stdDeviation: undefined});
-    @assert throws TypeError ctx.filter = new CanvasFilter({name: 'gaussianBlur', stdDeviation: 'foo'});
-    @assert throws TypeError ctx.filter = new CanvasFilter({name: 'gaussianBlur', stdDeviation: [1,2,3]});
-    @assert throws TypeError ctx.filter = new CanvasFilter({name: 'gaussianBlur', stdDeviation: NaN});
-    @assert throws TypeError ctx.filter = new CanvasFilter({name: 'gaussianBlur', stdDeviation: {}});
-
-- name: 2d.filter.canvasFilterObject.colorMatrix.tentative
-  desc: Test the functionality of ColorMatrix filters in CanvasFilter objects
+    @assert throws TypeError {{ filter_declaration | replace("param",
+      "{name: 'gaussianBlur'}") }};
+    @assert throws TypeError {{ filter_declaration | replace("param",
+      "{name: 'gaussianBlur', stdDeviation: undefined}") }};
+    @assert throws TypeError {{ filter_declaration | replace("param",
+      "{name: 'gaussianBlur', stdDeviation: 'foo'}") }};
+    @assert throws TypeError {{ filter_declaration | replace("param",
+      "{name: 'gaussianBlur', stdDeviation: [1,2,3]}") }};
+    @assert throws TypeError {{ filter_declaration | replace("param",
+      "{name: 'gaussianBlur', stdDeviation: NaN}") }};
+    @assert throws TypeError {{ filter_declaration | replace("param",
+      "{name: 'gaussianBlur', stdDeviation: {}}") }};
+  append_variants_to_name: false
+  variants:
+    layers:
+      filter_declaration: |-
+        ctx.beginLayer({filter:
+          param})
+    canvasFilterObject:
+      filter_declaration: |-
+        ctx.filter = new CanvasFilter(
+          param)
+      tentative: .tentative
+
+- name: 2d.filter.{{ variant_names[0] }}.colorMatrix{{ tentative }}
+  desc: Test the functionality of ColorMatrix filters
   code: |
-    @assert throws TypeError new CanvasFilter({name: 'colorMatrix', values: undefined});
-    @assert throws TypeError new CanvasFilter({name: 'colorMatrix', values: 'foo'});
-    @assert throws TypeError new CanvasFilter({name: 'colorMatrix', values: null});
-    @assert throws TypeError new CanvasFilter({name: 'colorMatrix', values: [1, 2, 3]});
-    @assert throws TypeError new CanvasFilter({name: 'colorMatrix', values: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 'a']});
-    @assert throws TypeError new CanvasFilter({name: 'colorMatrix', values: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, Infinity]});
+    @assert throws TypeError {{ filter_declaration | replace("param",
+      "{name: 'colorMatrix', values: undefined}") }};
+
+    @assert throws TypeError {{ filter_declaration | replace("param",
+      "{name: 'colorMatrix', values: 'foo'}") }};
+
+    @assert throws TypeError {{ filter_declaration | replace("param",
+      "{name: 'colorMatrix', values: null}") }};
+
+    @assert throws TypeError {{ filter_declaration | replace("param",
+      "{name: 'colorMatrix', values: [1, 2, 3]}") }};
+
+    @assert throws TypeError {{ filter_declaration | replace("param",
+      "{name: 'colorMatrix',
+       values: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18,
+                19, 'a']}") }};
+
+    @assert throws TypeError {{ filter_declaration | replace("param",
+      "{name: 'colorMatrix',
+       values: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18,
+                19, Infinity]}") }};
+
     ctx.fillStyle = '#f00';
-    ctx.filter = new CanvasFilter({name: 'colorMatrix', type: 'hueRotate', values: 0});
+    {{ filter_declaration | replace("param",
+      "{name: 'colorMatrix', type: 'hueRotate', values: 0}") }};
     ctx.fillRect(0, 0, 100, 50);
+    {{ close_layer -}}
     @assert pixel 10,10 ==~ 255,0,0,255;
-    ctx.filter = new CanvasFilter({name: 'colorMatrix', type: 'hueRotate', values: 90});
+
+    {{ filter_declaration | replace("param",
+      "{name: 'colorMatrix', type: 'hueRotate', values: 90}") }};
     ctx.fillRect(0, 0, 100, 50);
+    {{ close_layer -}}
     @assert pixel 10,10 ==~ 0,91,0,255;
-    ctx.filter = new CanvasFilter({name: 'colorMatrix', type: 'hueRotate', values: 180});
+
+    {{ filter_declaration | replace("param",
+      "{name: 'colorMatrix', type: 'hueRotate', values: 180}") }};
     ctx.fillRect(0, 0, 100, 50);
+    {{ close_layer -}}
     @assert pixel 10,10 ==~ 0,109,109,255;
-    ctx.filter = new CanvasFilter({name: 'colorMatrix', type: 'hueRotate', values: 270});
+
+    {{ filter_declaration | replace("param",
+      "{name: 'colorMatrix', type: 'hueRotate', values: 270}") }};
     ctx.fillRect(0, 0, 100, 50);
+    {{ close_layer -}}
     @assert pixel 10,10 ==~ 109,18,255,255;
-    ctx.filter = new CanvasFilter({name: 'colorMatrix', type: 'saturate', values: 0.5});
+
+    {{ filter_declaration | replace("param",
+      "{name: 'colorMatrix', type: 'saturate', values: 0.5}") }};
     ctx.fillRect(0, 0, 100, 50);
+    {{ close_layer -}}
     @assert pixel 10,10 ==~ 155,27,27,255;
+
     ctx.clearRect(0, 0, 100, 50);
-    ctx.filter = new CanvasFilter({name: 'colorMatrix', type: 'luminanceToAlpha'});
+    {{ filter_declaration | replace("param",
+      "{name: 'colorMatrix', type: 'luminanceToAlpha'}") }};
     ctx.fillRect(0, 0, 100, 50);
+    {{ close_layer -}}
     @assert pixel 10,10 ==~ 0,0,0,54;
-    ctx.filter = new CanvasFilter({name: 'colorMatrix', values: [
-            0, 0, 0, 0, 0,
-            1, 1, 1, 1, 0,
-            0, 0, 0, 0, 0,
-            0, 0, 0, 1, 0
-    ]});
+
+    {{ filter_declaration | replace("param", "{name: 'colorMatrix', values: [
+        0, 0, 0, 0, 0,
+        1, 1, 1, 1, 0,
+        0, 0, 0, 0, 0,
+        0, 0, 0, 1, 0
+      ]}") }};
     ctx.fillRect(0, 0, 50, 25);
     ctx.fillStyle = '#0f0';
     ctx.fillRect(50, 0, 50, 25);
@@ -141,51 +192,120 @@
     ctx.fillRect(0, 25, 50, 25);
     ctx.fillStyle = '#fff';
     ctx.fillRect(50, 25, 50, 25);
+    {{ close_layer -}}
     @assert pixel 10,10 ==~ 0,255,0,255;
     @assert pixel 60,10 ==~ 0,255,0,255;
     @assert pixel 10,30 ==~ 0,255,0,255;
     @assert pixel 60,30 ==~ 0,255,0,255;
-
-- name: 2d.filter.canvasFilterObject.convolveMatrix.exceptions.tentative
+  append_variants_to_name: false
+  variants:
+    layers:
+      filter_declaration: |-
+        ctx.beginLayer({filter:
+          param})
+      close_layer: |
+        ctx.endLayer();
+    canvasFilterObject:
+      filter_declaration: |-
+        ctx.filter = new CanvasFilter(
+          param)
+      tentative: .tentative
+
+- name: 2d.filter.{{ variant_names[0] }}.convolveMatrix.exceptions{{ tentative }}
   desc: Test exceptions on CanvasFilter() convolveMatrix
   code: |
-    @assert throws TypeError new CanvasFilter({name: 'convolveMatrix'});
-    @assert throws TypeError new CanvasFilter({name: 'convolveMatrix', divisor: 2});
-    @assert throws TypeError new CanvasFilter({name: 'convolveMatrix', kernelMatrix: null});
-    @assert throws TypeError new CanvasFilter({name: 'convolveMatrix', kernelMatrix: 1});
-    @assert throws TypeError new CanvasFilter({name: 'convolveMatrix', kernelMatrix: [[1, 0], [0]]});
-    @assert throws TypeError new CanvasFilter({name: 'convolveMatrix', kernelMatrix: [[1, 'a'], [0]]});
-    @assert throws TypeError new CanvasFilter({name: 'convolveMatrix', kernelMatrix: [[1, 0], 0]});
-    @assert throws TypeError new CanvasFilter({name: 'convolveMatrix', kernelMatrix: [[1, 0], [0, Infinity]]});
-    @assert throws TypeError new CanvasFilter({name: 'convolveMatrix', kernelMatrix: []});
-    @assert throws TypeError new CanvasFilter({name: 'convolveMatrix', kernelMatrix: [1]});
-    @assert throws TypeError new CanvasFilter({name: 'convolveMatrix', kernelMatrix: [1, 2, 3, 4]});
-    @assert throws TypeError new CanvasFilter({name: 'convolveMatrix', kernelMatrix: [[], []]});
-    @assert throws TypeError new CanvasFilter({name: 'convolveMatrix', kernelMatrix: [[1, 2], []]});
-    @assert throws TypeError new CanvasFilter({name: 'convolveMatrix', kernelMatrix: [[], [1, 2]]});
+    @assert throws TypeError {{ filter_declaration | replace("param",
+      "{name: 'convolveMatrix'}") }};
+    @assert throws TypeError {{ filter_declaration | replace("param",
+      "{name: 'convolveMatrix', divisor: 2}") }};
+    @assert throws TypeError {{ filter_declaration | replace("param",
+      "{name: 'convolveMatrix', kernelMatrix: null}") }};
+    @assert throws TypeError {{ filter_declaration | replace("param",
+      "{name: 'convolveMatrix', kernelMatrix: 1}") }};
+    @assert throws TypeError {{ filter_declaration | replace("param",
+      "{name: 'convolveMatrix', kernelMatrix: [[1, 0], [0]]}") }};
+    @assert throws TypeError {{ filter_declaration | replace("param",
+      "{name: 'convolveMatrix', kernelMatrix: [[1, 'a'], [0]]}") }};
+    @assert throws TypeError {{ filter_declaration | replace("param",
+      "{name: 'convolveMatrix', kernelMatrix: [[1, 0], 0]}") }};
+    @assert throws TypeError {{ filter_declaration | replace("param",
+      "{name: 'convolveMatrix', kernelMatrix: [[1, 0], [0, Infinity]]}") }};
+    @assert throws TypeError {{ filter_declaration | replace("param",
+      "{name: 'convolveMatrix', kernelMatrix: []}") }};
+    @assert throws TypeError {{ filter_declaration | replace("param",
+      "{name: 'convolveMatrix', kernelMatrix: [1]}") }};
+    @assert throws TypeError {{ filter_declaration | replace("param",
+      "{name: 'convolveMatrix', kernelMatrix: [1, 2, 3, 4]}") }};
+    @assert throws TypeError {{ filter_declaration | replace("param",
+      "{name: 'convolveMatrix', kernelMatrix: [[], []]}") }};
+    @assert throws TypeError {{ filter_declaration | replace("param",
+      "{name: 'convolveMatrix', kernelMatrix: [[1, 2], []]}") }};
+    @assert throws TypeError {{ filter_declaration | replace("param",
+      "{name: 'convolveMatrix', kernelMatrix: [[], [1, 2]]}") }};
     // This should not throw an error
-    ctx.filter = new CanvasFilter({name: 'convolveMatrix', kernelMatrix: [[]]});
-    ctx.filter = new CanvasFilter({name: 'convolveMatrix', kernelMatrix: [[1]]});
-
-- name: 2d.filter.canvasFilterObject.componentTransfer.linear.tentative
+    {{ filter_declaration | replace("param",
+      "{name: 'convolveMatrix', kernelMatrix: [[]]}") }};
+    {{ close_layer -}}
+    {{ filter_declaration | replace("param",
+      "{name: 'convolveMatrix', kernelMatrix: [[1]]}") }};
+    {{ close_layer -}}
+  append_variants_to_name: false
+  variants:
+    layers:
+      filter_declaration: |-
+        ctx.beginLayer({filter:
+          param})
+      close_layer: |
+        ctx.endLayer();
+    canvasFilterObject:
+      filter_declaration: |-
+        ctx.filter = new CanvasFilter(
+          param)
+      tentative: .tentative
+
+- name: >-
+    2d.filter.{{ variant_names[0] }}.componentTransfer.linear{{ tentative }}
   desc: Test pixels on CanvasFilter() componentTransfer with linear type
+  size: [100, 100]
+  fuzzy: maxDifference=0-2; totalPixels=0-500
   code: |
+    const slopes = [0.5, 1.2, -0.2];
+    const intercepts = [0.25, 0, 0.5];
+    {{ filter_declaration | replace("param", "{name: 'componentTransfer',
+        funcR: {type: 'linear', slope: slopes[0], intercept: intercepts[0]},
+        funcG: {type: 'linear', slope: slopes[1], intercept: intercepts[1]},
+        funcB: {type: 'linear', slope: slopes[2], intercept: intercepts[2]},
+    }") }};
+
+    const inputColors = [
+        [255, 255, 255],
+        [0, 0, 0],
+        [127, 0, 34],
+        [252, 186, 3],
+        [50, 68, 87],
+    ];
+
+    for (let i = 0 ; i < inputColors.length ; ++i) {
+        const color = inputColors[i];
+        ctx.fillStyle = `rgb(${color[0]}, ${color[1]}, ${color[2]})`;
+        ctx.fillRect(i * 10, i * 10, 10, 10);
+    }
+    {{ close_layer }}
+  reference: |
     // From https://www.w3.org/TR/SVG11/filters.html#feComponentTransferElement
     function getColor(inputColor, slopes, intercepts) {
         return [
-            Math.max(0, Math.min(1, inputColor[0]/255 * slopes[0] + intercepts[0])) * 255,
-            Math.max(0, Math.min(1, inputColor[1]/255 * slopes[1] + intercepts[1])) * 255,
-            Math.max(0, Math.min(1, inputColor[2]/255 * slopes[2] + intercepts[2])) * 255,
+            Math.max(0, Math.min(1,
+              inputColor[0]/255 * slopes[0] + intercepts[0])) * 255,
+            Math.max(0, Math.min(1,
+              inputColor[1]/255 * slopes[1] + intercepts[1])) * 255,
+            Math.max(0, Math.min(1,
+              inputColor[2]/255 * slopes[2] + intercepts[2])) * 255,
         ];
     }
 
     const slopes = [0.5, 1.2, -0.2];
     const intercepts = [0.25, 0, 0.5];
-    ctx.filter = new CanvasFilter({name: 'componentTransfer',
-        funcR: {type: 'linear', slope: slopes[0], intercept: intercepts[0]},
-        funcG: {type: 'linear', slope: slopes[1], intercept: intercepts[1]},
-        funcB: {type: 'linear', slope: slopes[2], intercept: intercepts[2]},
-    });
 
     const inputColors = [
         [255, 255, 255],
@@ -195,21 +315,35 @@
         [50, 68, 87],
     ];
 
-    for (const color of inputColors) {
+    for (let i = 0 ; i < inputColors.length ; ++i) {
+        const color = inputColors[i];
         let outputColor = getColor(color, slopes, intercepts);
-        ctx.fillStyle = `rgb(${color[0]}, ${color[1]}, ${color[2]})`;
-        ctx.fillRect(0, 0, 10, 10);
-        _assertPixelApprox(canvas, 5, 5, outputColor[0],outputColor[1],outputColor[2],255, 2);
+        ctx.fillStyle = `rgb(${outputColor[0]}, ${outputColor[1]},
+          ${outputColor[2]})`;
+        ctx.fillRect(i * 10, i * 10, 10, 10);
     }
-
-- name: 2d.filter.canvasFilterObject.componentTransfer.identity.tentative
+    {{ close_layer }}
+  append_variants_to_name: false
+  variants:
+    layers:
+      filter_declaration: |-
+        ctx.beginLayer({filter: param})
+      close_layer: ctx.endLayer();
+    canvasFilterObject:
+      filter_declaration: |-
+        ctx.filter = new CanvasFilter(param)
+      tentative: .tentative
+
+- name: >-
+    2d.filter.{{ variant_names[0] }}.componentTransfer.identity{{ tentative }}
   desc: Test pixels on CanvasFilter() componentTransfer with identity type
+  size: [100, 100]
   code: |
-    ctx.filter = new CanvasFilter({name: 'componentTransfer',
+    {{ filter_declaration | replace("param", "{name: 'componentTransfer',
         funcR: {type: 'identity'},
         funcG: {type: 'identity'},
         funcB: {type: 'identity'},
-    });
+    }") }};
 
     const inputColors = [
         [255, 255, 255],
@@ -219,32 +353,86 @@
         [50, 68, 87],
     ];
 
-    for (const color of inputColors) {
-        ctx.fillStyle = `rgba(${color[0]}, ${color[1]}, ${color[2]}, 1)`,
-        ctx.fillRect(0, 0, 10, 10);
-        _assertPixel(canvas, 5, 5, color[0],color[1],color[2],255);
+    for (let i = 0 ; i < inputColors.length ; ++i) {
+        const color = inputColors[i];
+        ctx.fillStyle = `rgb(${color[0]}, ${color[1]}, ${color[2]})`;
+        ctx.fillRect(i * 10, i * 10, 10, 10);
     }
+    {{ close_layer }}
+  reference: |
+    const inputColors = [
+        [255, 255, 255],
+        [0, 0, 0],
+        [127, 0, 34],
+        [252, 186, 3],
+        [50, 68, 87],
+    ];
 
-- name: 2d.filter.canvasFilterObject.componentTransfer.gamma.tentative
+    for (let i = 0 ; i < inputColors.length ; ++i) {
+        let outputColor = inputColors[i];
+        ctx.fillStyle = `rgb(${outputColor[0]}, ${outputColor[1]},
+          ${outputColor[2]})`;
+        ctx.fillRect(i * 10, i * 10, 10, 10);
+    }
+  append_variants_to_name: false
+  variants:
+    layers:
+      filter_declaration: |-
+        ctx.beginLayer({filter: param})
+      close_layer: ctx.endLayer();
+    canvasFilterObject:
+      filter_declaration: |-
+        ctx.filter = new CanvasFilter(param)
+      tentative: .tentative
+
+- name: >-
+    2d.filter.{{ variant_names[0] }}.componentTransfer.gamma{{ tentative }}
   desc: Test pixels on CanvasFilter() componentTransfer with gamma type
+  size: [100, 100]
+  fuzzy: maxDifference=0-2; totalPixels=0-500
   code: |
+    const amplitudes = [2, 1.1, 0.5];
+    const exponents = [5, 3, 1];
+    const offsets = [0.25, 0, 0.5];
+    {{ filter_declaration | replace("param", "{name: 'componentTransfer',
+        funcR: {type: 'gamma', amplitude: amplitudes[0],
+          exponent: exponents[0], offset: offsets[0]},
+        funcG: {type: 'gamma', amplitude: amplitudes[1],
+          exponent: exponents[1], offset: offsets[1]},
+        funcB: {type: 'gamma', amplitude: amplitudes[2],
+          exponent: exponents[2], offset: offsets[2]},
+    }") }};
+
+    const inputColors = [
+        [255, 255, 255],
+        [0, 0, 0],
+        [127, 0, 34],
+        [252, 186, 3],
+        [50, 68, 87],
+    ];
+
+    for (let i = 0 ; i < inputColors.length ; ++i) {
+        const color = inputColors[i];
+        ctx.fillStyle = `rgb(${color[0]}, ${color[1]}, ${color[2]})`;
+        ctx.fillRect(i * 10, i * 10, 10, 10);
+    }
+    {{ close_layer }}
+  reference: |
     // From https://www.w3.org/TR/SVG11/filters.html#feComponentTransferElement
     function getColor(inputColor, amplitude, exponent, offset) {
         return [
-            Math.max(0, Math.min(1, Math.pow(inputColor[0]/255, exponent[0]) * amplitude[0] + offset[0])) * 255,
-            Math.max(0, Math.min(1, Math.pow(inputColor[1]/255, exponent[1]) * amplitude[1] + offset[1])) * 255,
-            Math.max(0, Math.min(1, Math.pow(inputColor[2]/255, exponent[2]) * amplitude[2] + offset[2])) * 255,
+            Math.max(0, Math.min(1, Math.pow(inputColor[0]/255,
+              exponent[0]) * amplitude[0] + offset[0])) * 255,
+            Math.max(0, Math.min(1, Math.pow(inputColor[1]/255,
+              exponent[1]) * amplitude[1] + offset[1])) * 255,
+            Math.max(0, Math.min(1, Math.pow(inputColor[2]/255,
+              exponent[2]) * amplitude[2] + offset[2])) * 255,
         ];
     }
 
     const amplitudes = [2, 1.1, 0.5];
     const exponents = [5, 3, 1];
     const offsets = [0.25, 0, 0.5];
-    ctx.filter = new CanvasFilter({name: 'componentTransfer',
-        funcR: {type: 'gamma', amplitude: amplitudes[0], exponent: exponents[0], offset: offsets[0]},
-        funcG: {type: 'gamma', amplitude: amplitudes[1], exponent: exponents[1], offset: offsets[1]},
-        funcB: {type: 'gamma', amplitude: amplitudes[2], exponent: exponents[2], offset: offsets[2]},
-    });
 
     const inputColors = [
         [255, 255, 255],
@@ -254,16 +442,54 @@
         [50, 68, 87],
     ];
 
-    for (const color of inputColors) {
+    for (let i = 0 ; i < inputColors.length ; ++i) {
+        const color = inputColors[i];
         let outputColor = getColor(color, amplitudes, exponents, offsets);
-        ctx.fillStyle = `rgb(${color[0]}, ${color[1]}, ${color[2]})`;
-        ctx.fillRect(0, 0, 10, 10);
-        _assertPixelApprox(canvas, 5, 5, outputColor[0],outputColor[1],outputColor[2],255, 2);
+        ctx.fillStyle = `rgb(${outputColor[0]}, ${outputColor[1]},
+          ${outputColor[2]})`;
+        ctx.fillRect(i * 10, i * 10, 10, 10);
     }
-
-- name: 2d.filter.canvasFilterObject.componentTransfer.table.tentative
+  append_variants_to_name: false
+  variants:
+    layers:
+      filter_declaration: |-
+        ctx.beginLayer({filter: param})
+      close_layer: ctx.endLayer();
+    canvasFilterObject:
+      filter_declaration: |-
+        ctx.filter = new CanvasFilter(param)
+      tentative: .tentative
+
+- name: >-
+    2d.filter.{{ variant_names[0] }}.componentTransfer.table{{ tentative }}
   desc: Test pixels on CanvasFilter() componentTransfer with table type
+  size: [100, 100]
+  fuzzy: maxDifference=0-2; totalPixels=0-500
   code: |
+    tableValuesR = [0, 0, 1, 1];
+    tableValuesG = [2, 0, 0.5, 3];
+    tableValuesB = [1, -1, 5, 0];
+    {{ filter_declaration | replace("param", "{name: 'componentTransfer',
+        funcR: {type: 'table', tableValues: tableValuesR},
+        funcG: {type: 'table', tableValues: tableValuesG},
+        funcB: {type: 'table', tableValues: tableValuesB},
+    }") }};
+
+    const inputColors = [
+        [255, 255, 255],
+        [0, 0, 0],
+        [127, 0, 34],
+        [252, 186, 3],
+        [50, 68, 87],
+    ];
+
+    for (let i = 0 ; i < inputColors.length ; ++i) {
+        const color = inputColors[i];
+        ctx.fillStyle = `rgb(${color[0]}, ${color[1]}, ${color[2]})`;
+        ctx.fillRect(i * 10, i * 10, 10, 10);
+    }
+    {{ close_layer }}
+  reference: |
     // From https://www.w3.org/TR/SVG11/filters.html#feComponentTransferElement
     function getTransformedValue(C, V) {
         // Get the right interval
@@ -285,11 +511,6 @@
     tableValuesR = [0, 0, 1, 1];
     tableValuesG = [2, 0, 0.5, 3];
     tableValuesB = [1, -1, 5, 0];
-    ctx.filter = new CanvasFilter({name: 'componentTransfer',
-        funcR: {type: 'table', tableValues: tableValuesR},
-        funcG: {type: 'table', tableValues: tableValuesG},
-        funcB: {type: 'table', tableValues: tableValuesB},
-    });
 
     const inputColors = [
         [255, 255, 255],
@@ -299,16 +520,55 @@
         [50, 68, 87],
     ];
 
-    for (const color of inputColors) {
-        let outputColor = getColor(color, [tableValuesR, tableValuesG, tableValuesB]);
-        ctx.fillStyle = `rgb(${color[0]}, ${color[1]}, ${color[2]})`;
-        ctx.fillRect(0, 0, 10, 10);
-        _assertPixelApprox(canvas, 5, 5, outputColor[0],outputColor[1],outputColor[2],255, 2);
+    for (let i = 0 ; i < inputColors.length ; ++i) {
+        const color = inputColors[i];
+        let outputColor = getColor(
+            color, [tableValuesR, tableValuesG, tableValuesB]);
+        ctx.fillStyle = `rgb(${outputColor[0]}, ${outputColor[1]},
+          ${outputColor[2]})`;
+        ctx.fillRect(i * 10, i * 10, 10, 10);
     }
-
-- name: 2d.filter.canvasFilterObject.componentTransfer.discrete.tentative
+  append_variants_to_name: false
+  variants:
+    layers:
+      filter_declaration: |-
+        ctx.beginLayer({filter: param})
+      close_layer: ctx.endLayer();
+    canvasFilterObject:
+      filter_declaration: |-
+        ctx.filter = new CanvasFilter(param)
+      tentative: .tentative
+
+- name: >-
+    2d.filter.{{ variant_names[0] }}.componentTransfer.discrete{{ tentative }}
   desc: Test pixels on CanvasFilter() componentTransfer with discrete type
+  size: [100, 100]
+  fuzzy: maxDifference=0-2; totalPixels=0-500
   code: |
+    tableValuesR = [0, 0, 1, 1];
+    tableValuesG = [2, 0, 0.5, 3];
+    tableValuesB = [1, -1, 5, 0];
+    {{ filter_declaration | replace("param", "{name: 'componentTransfer',
+        funcR: {type: 'discrete', tableValues: tableValuesR},
+        funcG: {type: 'discrete', tableValues: tableValuesG},
+        funcB: {type: 'discrete', tableValues: tableValuesB},
+    }") }};
+
+    const inputColors = [
+        [255, 255, 255],
+        [0, 0, 0],
+        [127, 0, 34],
+        [252, 186, 3],
+        [50, 68, 87],
+    ];
+
+    for (let i = 0 ; i < inputColors.length ; ++i) {
+        const color = inputColors[i];
+        ctx.fillStyle = `rgb(${color[0]}, ${color[1]}, ${color[2]})`;
+        ctx.fillRect(i * 10, i * 10, 10, 10);
+    }
+    {{ close_layer }}
+  reference: |
     // From https://www.w3.org/TR/SVG11/filters.html#feComponentTransferElement
     function getTransformedValue(C, V) {
         // Get the right interval
@@ -330,11 +590,6 @@
     tableValuesR = [0, 0, 1, 1];
     tableValuesG = [2, 0, 0.5, 3];
     tableValuesB = [1, -1, 5, 0];
-    ctx.filter = new CanvasFilter({name: 'componentTransfer',
-        funcR: {type: 'discrete', tableValues: tableValuesR},
-        funcG: {type: 'discrete', tableValues: tableValuesG},
-        funcB: {type: 'discrete', tableValues: tableValuesB},
-    });
 
     const inputColors = [
         [255, 255, 255],
@@ -343,24 +598,38 @@
         [252, 186, 3],
         [50, 68, 87],
     ];
-
-    for (const color of inputColors) {
-        let outputColor = getColor(color, [tableValuesR, tableValuesG, tableValuesB]);
-        ctx.fillStyle = `rgb(${color[0]}, ${color[1]}, ${color[2]})`;
-        ctx.fillRect(0, 0, 10, 10);
-        _assertPixelApprox(canvas, 5, 5, outputColor[0],outputColor[1],outputColor[2],255, 2);
+    for (let i = 0 ; i < inputColors.length ; ++i) {
+        const color = inputColors[i];
+        let outputColor = getColor(
+            color, [tableValuesR, tableValuesG, tableValuesB]);
+        ctx.fillStyle = `rgb(${outputColor[0]}, ${outputColor[1]},
+          ${outputColor[2]})`;
+        ctx.fillRect(i * 10, i * 10, 10, 10);
     }
-
-- name: 2d.filter.canvasFilterObject.gaussianBlur.tentative
+  append_variants_to_name: false
+  variants:
+    layers:
+      filter_declaration: |-
+        ctx.beginLayer({filter: param})
+      close_layer: ctx.endLayer();
+    canvasFilterObject:
+      filter_declaration: |-
+        ctx.filter = new CanvasFilter(param)
+      tentative: .tentative
+
+- name: >-
+    2d.filter.{{ variant_names[0] }}.gaussianBlur.{{ variant_names[1] }}{{
+    tentative }}
   desc: Test CanvasFilter() with gaussianBlur.
   size: [100, 100]
   code: |
     ctx.fillStyle = 'teal';
-    ctx.filter = new CanvasFilter({
+    {{ filter_declaration | replace("param", "{
         name: 'gaussianBlur',
         stdDeviation: [{{ blur_x }}, {{blur_y}}],
-    });
+    }") }}
     ctx.fillRect(25, 25, 50, 50);
+    {{ close_layer }}
   html_reference: |
     <svg xmlns="http://www.w3.org/2000/svg"
          width="{{ size[0] }}" height="{{ size[1] }}"
@@ -371,24 +640,33 @@
       <rect x="25" y="25" width="50" height="50"
             fill="teal" filter="url(#blur)" />
     </svg>
-  variants:
-    x-only:
-      blur_x: 4
-      blur_y: 0
-    mostly-x:
-      blur_x: 4
-      blur_y: 1
-    isotropic:
-      blur_x: 4
-      blur_y: 4
-    mostly-y:
-      blur_x: 1
-      blur_y: 4
-    y-only:
-      blur_x: 0
-      blur_y: 4
-
-- name: 2d.filter.canvasFilterObject.dropShadow.tentative
+  append_variants_to_name: false
+  variant_matrix:
+    - layers:
+        filter_declaration: |-
+          ctx.beginLayer({filter: param});
+        close_layer: ctx.endLayer();
+      canvasFilterObject:
+        filter_declaration: |-
+          ctx.filter = new CanvasFilter(param);
+        tentative: .tentative
+    - x-only:
+        blur_x: 4
+        blur_y: 0
+      mostly-x:
+        blur_x: 4
+        blur_y: 1
+      isotropic:
+        blur_x: 4
+        blur_y: 4
+      mostly-y:
+        blur_x: 1
+        blur_y: 4
+      y-only:
+        blur_x: 0
+        blur_y: 4
+
+- name: 2d.filter.{{ variant_names[0] }}.dropShadow{{ tentative }}
   desc: Test CanvasFilter() dropShadow object.
   size: [520, 420]
   code: |
@@ -401,90 +679,91 @@
     ctx.fillStyle = 'crimson';
 
     // Parameter defaults.
-    ctx.filter = new CanvasFilter({name: 'dropShadow'});
+    {{ filter_declaration | replace("param", "{name: 'dropShadow'}") }}
     ctx.fillRect(10, 10, 80, 80);
+    {{ close_layer -}}
 
     // All parameters specified.
-    ctx.filter = new CanvasFilter(
-      {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 5,
-       floodColor: 'purple', floodOpacity: 0.7});
+    {{ filter_declaration | replace("param", "{name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 5,
+       floodColor: 'purple', floodOpacity: 0.7}") }}
     ctx.fillRect(110, 10, 80, 80);
+    {{ close_layer -}}
 
     // Named color.
-    ctx.filter = new CanvasFilter(
-      {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 3,
-       floodColor: 'purple'});
+    {{ filter_declaration | replace("param", "{name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 3,
+       floodColor: 'purple'}") }}
     ctx.fillRect(10, 110, 80, 80);
+    {{ close_layer -}}
 
     // System color.
-    ctx.filter = new CanvasFilter(
-      {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 3,
-       floodColor: 'LinkText'});
+    {{ filter_declaration | replace("param", "{name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 3,
+       floodColor: 'LinkText'}") }}
     ctx.fillRect(110, 110, 80, 80);
+    {{ close_layer -}}
 
     // Numerical color.
-    ctx.filter = new CanvasFilter(
-      {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 3,
-       floodColor: 'rgba(20, 50, 130, 1)'});
+    {{ filter_declaration | replace("param", "{name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 3,
+       floodColor: 'rgba(20, 50, 130, 1)'}") }}
     ctx.fillRect(210, 110, 80, 80);
+    {{ close_layer -}}
 
     // Transparent floodColor.
-    ctx.filter = new CanvasFilter(
-      {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 3,
-       floodColor: 'rgba(20, 50, 130, 0.7)'});
+    {{ filter_declaration | replace("param", "{name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 3,
+       floodColor: 'rgba(20, 50, 130, 0.7)'}") }}
     ctx.fillRect(310, 110, 80, 80);
+    {{ close_layer -}}
 
     // Transparent floodColor and floodOpacity.
-    ctx.filter = new CanvasFilter(
-      {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 3,
-       floodColor: 'rgba(20, 50, 130, 0.7)', floodOpacity: 0.7});
+    {{ filter_declaration | replace("param", "{name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 3,
+       floodColor: 'rgba(20, 50, 130, 0.7)', floodOpacity: 0.7}") }}
     ctx.fillRect(410, 110, 80, 80);
+    {{ close_layer -}}
 
     // No blur.
-    ctx.filter = new CanvasFilter(
-      {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 0,
-       floodColor: 'purple'});
+    {{ filter_declaration | replace("param", "{name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 0,
+       floodColor: 'purple'}") }}
     ctx.fillRect(10, 210, 80, 80);
+    {{ close_layer -}}
 
     // Single float blur.
-    ctx.filter = new CanvasFilter(
-      {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 5,
-       floodColor: 'purple'});
+    {{ filter_declaration | replace("param", "{name: 'dropShadow', dx: 9, dy: 12, stdDeviation: 5,
+       floodColor: 'purple'}") }}
     ctx.fillRect(110, 210, 80, 80);
+    {{ close_layer -}}
 
     // Single negative float blur.
-    ctx.filter = new CanvasFilter(
-      {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: -5,
-       floodColor: 'purple'});
+    {{ filter_declaration | replace("param", "{name: 'dropShadow', dx: 9, dy: 12, stdDeviation: -5,
+       floodColor: 'purple'}") }}
     ctx.fillRect(210, 210, 80, 80);
+    {{ close_layer -}}
 
     // Two floats (X&Y) blur.
-    ctx.filter = new CanvasFilter(
-      {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: [3, 5],
-       floodColor: 'purple'});
+    {{ filter_declaration | replace("param", "{name: 'dropShadow', dx: 9, dy: 12, stdDeviation: [3, 5],
+       floodColor: 'purple'}") }}
     ctx.fillRect(310, 210, 80, 80);
+    {{ close_layer -}}
 
     // Two negative floats (X&Y) blur.
-    ctx.filter = new CanvasFilter(
-      {name: 'dropShadow', dx: 9, dy: 12, stdDeviation: [-3, -5],
-       floodColor: 'purple'});
+    {{ filter_declaration | replace("param", "{name: 'dropShadow', dx: 9, dy: 12, stdDeviation: [-3, -5],
+       floodColor: 'purple'}") }}
     ctx.fillRect(410, 210, 80, 80);
+    {{ close_layer -}}
 
     // Degenerate parameter values.
-    ctx.filter = new CanvasFilter(
-      {name: 'dropShadow', dx: [-5], dy: [], stdDeviation: null,
-       floodColor: 'purple', floodOpacity: [2]});
+    {{ filter_declaration | replace("param", "{name: 'dropShadow', dx: [-5], dy: [], stdDeviation: null,
+       floodColor: 'purple', floodOpacity: [2]}") }}
     ctx.fillRect(10, 310, 80, 80);
+    {{ close_layer -}}
 
-    ctx.filter = new CanvasFilter(
-      {name: 'dropShadow', dx: null, dy: '5', stdDeviation: [[-5], ['3']],
-       floodColor: 'purple', floodOpacity: '0.8'});
+    {{ filter_declaration | replace("param", "{name: 'dropShadow', dx: null, dy: '5', stdDeviation: [[-5], ['3']],
+       floodColor: 'purple', floodOpacity: '0.8'}") }}
     ctx.fillRect(110, 310, 80, 80);
+    {{ close_layer -}}
 
-    ctx.filter = new CanvasFilter(
-      {name: 'dropShadow', dx: true, dy: ['10'], stdDeviation: false,
-       floodColor: 'purple', floodOpacity: ['0.4']});
+    {{ filter_declaration | replace("param", "{name: 'dropShadow', dx: true, dy: ['10'], stdDeviation: false,
+       floodColor: 'purple', floodOpacity: ['0.4']}") }}
     ctx.fillRect(210, 310, 80, 80);
+    {{ close_layer -}}
   html_reference: |
     <svg xmlns="http://www.w3.org/2000/svg"
          width={{ size[0] }} height={{ size[1] }}
@@ -537,41 +816,70 @@
       <rect x=210 y=310 width=80 height=80 fill="crimson"
             filter="drop-shadow(1px 10px 0px rgba(128, 0, 128, 0.4))"/>
     </svg>
-
-- name: 2d.filter.canvasFilterObject.dropShadow.exceptions.tentative
+  append_variants_to_name: false
+  variants:
+    layers:
+      filter_declaration: |-
+        ctx.beginLayer({filter: param});
+      close_layer: |
+        ctx.endLayer();
+    canvasFilterObject:
+      filter_declaration: |-
+        ctx.filter = new CanvasFilter(param);
+      tentative: .tentative
+
+- name: 2d.filter.{{ variant_names[0] }}.dropShadow.exceptions{{ tentative }}
   desc: Test exceptions on CanvasFilter() dropShadow object
   code: |
-    @unroll @assert new CanvasFilter({\-
+    // Should not throw an error.
+    @unroll {{ filter_declaration | replace("param", "{\-
         name: 'dropShadow', \-
         <dx | dy | floodOpacity>: \-
-        <10 | -1 | 0.5 | null | true | false | [] | [20] | '30'>});
-    @unroll @assert new CanvasFilter({\-
+        <10 | -1 | 0.5 | null | true | false | [] | [20] | '30'>}") }};
+    @unroll {{ filter_declaration | replace("param", "{\-
+        name: 'dropShadow', \-
+        <dx | dy | floodOpacity>: \-
+        <10 | -1 | 0.5 | null | true | false | [] | [20] | '30'>}") }};
+    @unroll {{ filter_declaration | replace("param", "{\-
         name: 'dropShadow', \-
         <stdDeviation>: \-
         <10 | -1 | 0.5 | null | true | false | [] | [20] | '30' | \-
          [10, -1] | [0.5, null] | [true, false] | [[], [20]] | \-
-         ['30', ['40']]>});
-    @unroll @assert new CanvasFilter({\-
+         ['30', ['40']]>}") }};
+    @unroll {{ filter_declaration | replace("param", "{\-
         name: 'dropShadow', \-
         <floodColor>: \-
-        <'red' | 'canvas' | 'rgba(4, -3, 0.5, 1)' | '#aabbccdd' | '#abcd'>});
+        <'red' | 'canvas' | 'rgba(4, -3, 0.5, 1)' | '#aabbccdd' |
+          '#abcd'>}") }};
 
-    @unroll @assert throws TypeError new CanvasFilter({\-
-        name: 'dropShadow', \-
+    // Should throw a TypeError.
+    @unroll @assert throws TypeError {{ filter_declaration | replace("param", \-
+        "{name: 'dropShadow', \-
         <dx | dy | floodOpacity>: \-
-        <NaN | Infinity | -Infinity | undefined | 'test' | {} | [1, 2]>});
-    @unroll @assert throws TypeError new CanvasFilter({\-
-        name: 'dropShadow', \-
+        <NaN | Infinity | -Infinity | undefined | 'test' | {} | [1, 2]>}") }};
+    @unroll @assert throws TypeError {{ filter_declaration | replace("param", \-
+        "{name: 'dropShadow', \-
         <stdDeviation>: \-
         <NaN | Infinity | -Infinity | undefined | 'test' | {} | [1, 2, 3] | \-
          [1, NaN] | [1, Infinity] | [1, -Infinity] | [1, undefined] | \-
-         [1, 'test'] | [1, {}] | [1, [2, 3]]>});
-    @unroll @assert throws TypeError new CanvasFilter({\-
-        name: 'dropShadow', \-
+         [1, 'test'] | [1, {}] | [1, [2, 3]]>}") }};
+    @unroll @assert throws TypeError {{ filter_declaration | replace("param", \-
+        "{name: 'dropShadow', \-
         <floodColor>: \-
-        <'test' | 'rgba(NaN, 3, 2, 1)' | 10 | undefined | null | NaN>});
-
-- name: 2d.filter.canvasFilterObject.turbulence.inputTypes.tentative
+        <'test' | 'rgba(NaN, 3, 2, 1)' | 10 | undefined | null | NaN>}") }};
+  append_variants_to_name: false
+  variants:
+    layers:
+      filter_declaration: |-
+        ctx.beginLayer({filter:
+          param}); ctx.endLayer()
+    canvasFilterObject:
+      filter_declaration: |-
+        ctx.filter = new CanvasFilter(
+          param)
+      tentative: .tentative
+
+- name: 2d.filter.{{ variant_names[0] }}.turbulence.inputTypes{{ tentative }}
   desc: Test exceptions on CanvasFilter() turbulence object
   code: |
     const errorTestCases = [
@@ -671,10 +979,22 @@
 
     for (testCase of errorTestCases) {
       const filterOptions = {...{name: 'turbulence'}, ...testCase};
-      @assert throws TypeError new CanvasFilter(filterOptions);
+      @assert throws TypeError {{ filter_declaration |
+        replace("param", "filterOptions") }};
     }
 
     for (testCase of workingTestCases) {
       const filterOptions = {...{name: 'turbulence'}, ...testCase};
-      @assert new CanvasFilter(filterOptions) != null;
+      {{ filter_declaration | replace("param", "filterOptions") }};
+      {{- close_layer }}
     }
+  append_variants_to_name: false
+  variants:
+    layers:
+      filter_declaration: |-
+        ctx.beginLayer({filter: param})
+      close_layer: "\n  ctx.endLayer();"
+    canvasFilterObject:
+      filter_declaration: |-
+        ctx.filter = new CanvasFilter(param)
+      tentative: .tentative
diff --git a/testing/web-platform/tests/html/canvas/tools/yaml-new/layers.yaml b/testing/web-platform/tests/html/canvas/tools/yaml-new/layers.yaml
index a44cb2ea2c..437a70c3f7 100644
--- a/testing/web-platform/tests/html/canvas/tools/yaml-new/layers.yaml
+++ b/testing/web-platform/tests/html/canvas/tools/yaml-new/layers.yaml
@@ -44,7 +44,7 @@
   variants: &global-state-variants
     no-global-states:
       render_states: // No global states.
-    alpha:
+    alpha: &global-state-alpha
       render_states: ctx.globalAlpha = 0.6;
     blending:
       render_states: ctx.globalCompositeOperation = 'multiply';
@@ -56,15 +56,15 @@
         ctx.shadowOffsetY = 10;
         ctx.shadowColor = 'rgba(255, 165, 0, 0.5)';
         ctx.shadowBlur = 3;
-    alpha.blending:
+    alpha.blending: &global-state-alpha-blending
       render_states: |-
         ctx.globalAlpha = 0.6;
         ctx.globalCompositeOperation = 'multiply';
-    alpha.composite:
+    alpha.composite: &global-state-alpha-composite
       render_states: |-
         ctx.globalAlpha = 0.6;
         ctx.globalCompositeOperation = 'source-in';
-    alpha.shadow:
+    alpha.shadow: &global-state-alpha-shadow
       render_states: |-
         ctx.globalAlpha = 0.5;
         ctx.shadowOffsetX = -10;
@@ -167,7 +167,20 @@
       ctx.drawImage(img, 0, 0);
     };
     img.src = 'data:image/svg+xml;base64,' + btoa(svg);
-  variants: *global-state-variants
+  variants:
+    <<: *global-state-variants
+    alpha:
+      <<: *global-state-alpha
+      fuzzy: maxDifference=0-2; totalPixels=0-6766
+    alpha.blending:
+      <<: *global-state-alpha-blending
+      fuzzy: maxDifference=0-1; totalPixels=0-2453
+    alpha.composite:
+      <<: *global-state-alpha-composite
+      fuzzy: maxDifference=0-1; totalPixels=0-5204
+    alpha.shadow:
+      <<: *global-state-alpha-shadow
+      fuzzy: maxDifference=0-2; totalPixels=0-6311
 
 - name: 2d.layer.global-filter
   desc: Tests that layers ignore the global context filter.
@@ -334,6 +347,144 @@
 
     ctx.drawImage(canvas2, 0, 0);
 
+- name: 2d.layer.ctm.filter
+  desc: Checks that parent transforms affect layer filters.
+  size: [200, 200]
+  code: |
+    // Transforms inside the layer should not apply to the layer's filter.
+    ctx.beginLayer({filter: 'drop-shadow(5px 5px 0px grey)'});
+    ctx.translate(30, 90);
+    ctx.scale(2, 2);
+    ctx.rotate(Math.PI / 2);
+    ctx.fillRect(-30, -5, 60, 10);
+    ctx.endLayer();
+
+    // Transforms in the layer's parent should apply to the layer's filter.
+    ctx.translate(80, 90);
+    ctx.scale(2, 2);
+    ctx.rotate(Math.PI / 2);
+    ctx.beginLayer({filter: 'drop-shadow(5px 5px 0px grey)'});
+    ctx.fillRect(-30, -5, 60, 10);
+    ctx.endLayer();
+  html_reference: |
+    <svg xmlns="http://www.w3.org/2000/svg"
+          width="{{ size[0] }}" height="{{ size[1] }}"
+          color-interpolation-filters="sRGB">
+      <filter id="filter" x="-100%" y="-100%" width="300%" height="300%">
+        <feDropShadow dx="5" dy="5" stdDeviation="0" flood-color="grey" />
+      </filter>
+
+      <g filter="url(#filter)">
+        <g transform="translate(30, 90) scale(2) rotate(90)">
+          <rect x="-30" y="-5" width=60 height=10></rect>
+        </g>
+      </g>
+
+      <g transform="translate(80, 90) scale(2) rotate(90)">
+        <g filter="url(#filter)">
+          <rect x="-30" y="-5" width=60 height=10></rect>
+        </g>
+      </g>
+    </svg>
+
+- name: 2d.layer.ctm.shadow-in-transformed-layer
+  desc: Check shadows inside of a transformed layer.
+  size: [200, 200]
+  code: |
+    ctx.translate(80, 90);
+    ctx.scale(2, 2);
+    ctx.rotate(Math.PI / 2);
+
+    ctx.beginLayer();
+    ctx.shadowOffsetX = 10;
+    ctx.shadowOffsetY = 10;
+    ctx.shadowColor = 'grey';
+    ctx.fillRect(-30, -5, 60, 10);
+
+    const canvas2 = new OffscreenCanvas(100, 100);
+    const ctx2 = canvas2.getContext('2d');
+    ctx2.fillStyle = 'blue';
+    ctx2.fillRect(0, 0, 40, 10);
+    ctx.drawImage(canvas2, -30, -30);
+
+    ctx.endLayer();
+  reference: |
+    ctx.translate(80, 90);
+    ctx.scale(2, 2);
+    ctx.rotate(Math.PI / 2);
+
+    ctx.shadowOffsetX = 10;
+    ctx.shadowOffsetY = 10;
+    ctx.shadowColor = 'grey';
+    ctx.fillRect(-30, -5, 60, 10);
+
+    const canvas2 = new OffscreenCanvas(100, 100);
+    const ctx2 = canvas2.getContext('2d');
+    ctx2.fillStyle = 'blue';
+    ctx2.fillRect(0, 0, 40, 10);
+    ctx.drawImage(canvas2, -30, -30);
+
+- name: 2d.layer.ctm.getTransform
+  desc: Tests getTransform inside layers.
+  code: |
+    ctx.translate(10, 20);
+    ctx.beginLayer();
+    ctx.scale(2, 3);
+    const m = ctx.getTransform();
+    assert_array_equals([m.a, m.b, m.c, m.d, m.e, m.f], [2, 0, 0, 3, 10, 20]);
+    ctx.endLayer();
+
+- name: 2d.layer.ctm.setTransform
+  desc: Tests setTransform inside layers.
+  code: |
+    ctx.translate(80, 0);
+
+    ctx.beginLayer();
+    ctx.rotate(2);
+    ctx.beginLayer();
+    ctx.scale(5, 6);
+    ctx.setTransform(4, 0, 0, 2, 20, 10);
+    ctx.fillStyle = 'blue';
+    ctx.fillRect(0, 0, 10, 10);
+    ctx.endLayer();
+    ctx.endLayer();
+
+    ctx.fillStyle = 'green';
+    ctx.fillRect(0, 0, 20, 20);
+  reference: |
+    ctx.translate(80, 0);
+    ctx.fillStyle = 'green';
+    ctx.fillRect(0, 0, 20, 20);
+
+    ctx.setTransform(4, 0, 0, 2, 20, 10);
+    ctx.fillStyle = 'blue';
+    ctx.fillRect(0, 0, 10, 10);
+
+- name: 2d.layer.ctm.resetTransform
+  desc: Tests resetTransform inside layers.
+  code: |
+    ctx.translate(40, 0);
+
+    ctx.beginLayer();
+    ctx.rotate(2);
+    ctx.beginLayer();
+    ctx.scale(5, 6);
+    ctx.resetTransform();
+    ctx.fillStyle = 'blue';
+    ctx.fillRect(0, 0, 20, 20);
+    ctx.endLayer();
+    ctx.endLayer();
+
+    ctx.fillStyle = 'green';
+    ctx.fillRect(0, 0, 20, 20);
+  reference: |
+    ctx.fillStyle = 'blue';
+    ctx.fillRect(0, 0, 20, 20);
+
+    ctx.translate(40, 0);
+    ctx.fillStyle = 'green';
+    ctx.fillRect(0, 0, 20, 20);
+
 - name: 2d.layer.clip-inside
   desc: Check clipping set inside the layer
   size: [100, 100]
@@ -627,6 +778,49 @@
     ctx.fillStyle = 'blue';
     ctx.fillRect(10, 10, 80, 50);
 
+- name: 2d.layer.drawImage
+  size: [200, 200]
+  desc: >-
+    Checks that drawImage writes the image to the layer and not the parent
+    directly.
+  code: |
+    ctx.fillStyle = 'skyblue';
+    ctx.fillRect(0, 0, 100, 100);
+
+    ctx.beginLayer({filter: {name: 'dropShadow', dx: -10, dy: -10,
+      stdDeviation: 0, floodColor: 'navy'}});
+
+    ctx.fillStyle = 'maroon';
+    ctx.fillRect(20, 20, 50, 50);
+
+    ctx.globalCompositeOperation = 'xor';
+
+    // The image should xor only with the layer content, not the parents'.
+    const canvas_image = new OffscreenCanvas(200,200);
+    const ctx_image = canvas_image.getContext("2d");
+    ctx_image.fillStyle = 'pink';
+    ctx_image.fillRect(40, 40, 50, 50);
+    ctx.drawImage(canvas_image, 0, 0);
+
+    ctx.endLayer();
+  reference: |
+    ctx.fillStyle = 'skyblue';
+    ctx.fillRect(0, 0, 100, 100);
+
+    ctx.beginLayer({filter: {name: 'dropShadow', dx: -10, dy: -10,
+      stdDeviation: 0, floodColor: 'navy'}});
+
+    ctx.fillStyle = 'maroon';
+    ctx.fillRect(20, 20, 50, 50);
+
+    ctx.globalCompositeOperation = 'xor';
+
+    // Should xor only with the layer content, not the parents'.
+    ctx.fillStyle = 'pink';
+    ctx.fillRect(40, 40, 50, 50);
+
+    ctx.endLayer();
+
 - name: 2d.layer.valid-calls
   desc: No exception raised on {{ variant_desc }}.
   variants:
-- 
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