From 43a97878ce14b72f0981164f87f2e35e14151312 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 7 Apr 2024 11:22:09 +0200
Subject: Adding upstream version 110.0.1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 testing/web-platform/tests/css/css-box/META.yml    |   5 +
 .../animation/margin-bottom-composition.html       |  78 ++++++++++++++
 .../css-box/animation/margin-interpolation.html    | 118 +++++++++++++++++++++
 .../css-box/animation/margin-left-composition.html |  78 ++++++++++++++
 .../animation/margin-right-composition.html        |  78 ++++++++++++++
 .../css-box/animation/margin-top-composition.html  |  78 ++++++++++++++
 .../animation/padding-bottom-composition.html      |  65 ++++++++++++
 .../css-box/animation/padding-interpolation.html   | 108 +++++++++++++++++++
 .../animation/padding-left-composition.html        |  65 ++++++++++++
 .../animation/padding-right-composition.html       |  65 ++++++++++++
 .../css-box/animation/padding-top-composition.html |  65 ++++++++++++
 .../tests/css/css-box/box-chrome-crash-001.html    |  30 ++++++
 .../tests/css/css-box/inheritance.html             |  35 ++++++
 .../margin-trim/block-container-block-001.html     |  34 ++++++
 .../margin-trim/block-container-block-002.html     |  45 ++++++++
 .../margin-trim/block-container-block-end-001.html |  33 ++++++
 .../margin-trim/block-container-block-end-002.html |  40 +++++++
 .../block-container-block-start-001.html           |  33 ++++++
 .../block-container-block-start-002.html           |  40 +++++++
 .../block-container-replaced-block-end.html        |  34 ++++++
 .../block-container-replaced-block-start.html      |  34 ++++++
 .../block-container-replaced-block.html            |  35 ++++++
 .../tests/css/css-box/parsing/clear-computed.html  |  24 +++++
 .../tests/css/css-box/parsing/clear-invalid.html   |  19 ++++
 .../tests/css/css-box/parsing/clear-valid.html     |  26 +++++
 .../tests/css/css-box/parsing/float-computed.html  |  23 ++++
 .../tests/css/css-box/parsing/float-invalid.html   |  20 ++++
 .../tests/css/css-box/parsing/float-valid.html     |  34 ++++++
 .../tests/css/css-box/parsing/height-invalid.html  |  30 ++++++
 .../tests/css/css-box/parsing/height-valid.html    |  30 ++++++
 .../tests/css/css-box/parsing/margin-computed.html |  46 ++++++++
 .../tests/css/css-box/parsing/margin-invalid.html  |  25 +++++
 .../css/css-box/parsing/margin-shorthand.html      |  43 ++++++++
 .../css/css-box/parsing/margin-trim-computed.html  |  34 ++++++
 .../tests/css/css-box/parsing/margin-trim.html     |  46 ++++++++
 .../tests/css/css-box/parsing/margin-valid.html    |  34 ++++++
 .../css/css-box/parsing/max-height-invalid.html    |  30 ++++++
 .../css/css-box/parsing/max-height-valid.html      |  31 ++++++
 .../css/css-box/parsing/max-width-invalid.html     |  30 ++++++
 .../tests/css/css-box/parsing/max-width-valid.html |  31 ++++++
 .../css/css-box/parsing/overflow-invalid.html      |  24 +++++
 .../tests/css/css-box/parsing/overflow-valid.html  |  35 ++++++
 .../css/css-box/parsing/padding-computed.html      |  51 +++++++++
 .../tests/css/css-box/parsing/padding-invalid.html |  29 +++++
 .../css/css-box/parsing/padding-shorthand.html     |  43 ++++++++
 .../tests/css/css-box/parsing/padding-valid.html   |  31 ++++++
 .../css/css-box/parsing/visibility-computed.html   |  20 ++++
 .../css/css-box/parsing/visibility-invalid.html    |  19 ++++
 .../css/css-box/parsing/visibility-valid.html      |  20 ++++
 .../tests/css/css-box/parsing/width-invalid.html   |  31 ++++++
 .../tests/css/css-box/parsing/width-valid.html     |  29 +++++
 51 files changed, 2084 insertions(+)
 create mode 100644 testing/web-platform/tests/css/css-box/META.yml
 create mode 100644 testing/web-platform/tests/css/css-box/animation/margin-bottom-composition.html
 create mode 100644 testing/web-platform/tests/css/css-box/animation/margin-interpolation.html
 create mode 100644 testing/web-platform/tests/css/css-box/animation/margin-left-composition.html
 create mode 100644 testing/web-platform/tests/css/css-box/animation/margin-right-composition.html
 create mode 100644 testing/web-platform/tests/css/css-box/animation/margin-top-composition.html
 create mode 100644 testing/web-platform/tests/css/css-box/animation/padding-bottom-composition.html
 create mode 100644 testing/web-platform/tests/css/css-box/animation/padding-interpolation.html
 create mode 100644 testing/web-platform/tests/css/css-box/animation/padding-left-composition.html
 create mode 100644 testing/web-platform/tests/css/css-box/animation/padding-right-composition.html
 create mode 100644 testing/web-platform/tests/css/css-box/animation/padding-top-composition.html
 create mode 100644 testing/web-platform/tests/css/css-box/box-chrome-crash-001.html
 create mode 100644 testing/web-platform/tests/css/css-box/inheritance.html
 create mode 100644 testing/web-platform/tests/css/css-box/margin-trim/block-container-block-001.html
 create mode 100644 testing/web-platform/tests/css/css-box/margin-trim/block-container-block-002.html
 create mode 100644 testing/web-platform/tests/css/css-box/margin-trim/block-container-block-end-001.html
 create mode 100644 testing/web-platform/tests/css/css-box/margin-trim/block-container-block-end-002.html
 create mode 100644 testing/web-platform/tests/css/css-box/margin-trim/block-container-block-start-001.html
 create mode 100644 testing/web-platform/tests/css/css-box/margin-trim/block-container-block-start-002.html
 create mode 100644 testing/web-platform/tests/css/css-box/margin-trim/block-container-replaced-block-end.html
 create mode 100644 testing/web-platform/tests/css/css-box/margin-trim/block-container-replaced-block-start.html
 create mode 100644 testing/web-platform/tests/css/css-box/margin-trim/block-container-replaced-block.html
 create mode 100644 testing/web-platform/tests/css/css-box/parsing/clear-computed.html
 create mode 100644 testing/web-platform/tests/css/css-box/parsing/clear-invalid.html
 create mode 100644 testing/web-platform/tests/css/css-box/parsing/clear-valid.html
 create mode 100644 testing/web-platform/tests/css/css-box/parsing/float-computed.html
 create mode 100644 testing/web-platform/tests/css/css-box/parsing/float-invalid.html
 create mode 100644 testing/web-platform/tests/css/css-box/parsing/float-valid.html
 create mode 100644 testing/web-platform/tests/css/css-box/parsing/height-invalid.html
 create mode 100644 testing/web-platform/tests/css/css-box/parsing/height-valid.html
 create mode 100644 testing/web-platform/tests/css/css-box/parsing/margin-computed.html
 create mode 100644 testing/web-platform/tests/css/css-box/parsing/margin-invalid.html
 create mode 100644 testing/web-platform/tests/css/css-box/parsing/margin-shorthand.html
 create mode 100644 testing/web-platform/tests/css/css-box/parsing/margin-trim-computed.html
 create mode 100644 testing/web-platform/tests/css/css-box/parsing/margin-trim.html
 create mode 100644 testing/web-platform/tests/css/css-box/parsing/margin-valid.html
 create mode 100644 testing/web-platform/tests/css/css-box/parsing/max-height-invalid.html
 create mode 100644 testing/web-platform/tests/css/css-box/parsing/max-height-valid.html
 create mode 100644 testing/web-platform/tests/css/css-box/parsing/max-width-invalid.html
 create mode 100644 testing/web-platform/tests/css/css-box/parsing/max-width-valid.html
 create mode 100644 testing/web-platform/tests/css/css-box/parsing/overflow-invalid.html
 create mode 100644 testing/web-platform/tests/css/css-box/parsing/overflow-valid.html
 create mode 100644 testing/web-platform/tests/css/css-box/parsing/padding-computed.html
 create mode 100644 testing/web-platform/tests/css/css-box/parsing/padding-invalid.html
 create mode 100644 testing/web-platform/tests/css/css-box/parsing/padding-shorthand.html
 create mode 100644 testing/web-platform/tests/css/css-box/parsing/padding-valid.html
 create mode 100644 testing/web-platform/tests/css/css-box/parsing/visibility-computed.html
 create mode 100644 testing/web-platform/tests/css/css-box/parsing/visibility-invalid.html
 create mode 100644 testing/web-platform/tests/css/css-box/parsing/visibility-valid.html
 create mode 100644 testing/web-platform/tests/css/css-box/parsing/width-invalid.html
 create mode 100644 testing/web-platform/tests/css/css-box/parsing/width-valid.html

(limited to 'testing/web-platform/tests/css/css-box')

diff --git a/testing/web-platform/tests/css/css-box/META.yml b/testing/web-platform/tests/css/css-box/META.yml
new file mode 100644
index 0000000000..dde409360f
--- /dev/null
+++ b/testing/web-platform/tests/css/css-box/META.yml
@@ -0,0 +1,5 @@
+spec: https://drafts.csswg.org/css-box/
+suggested_reviewers:
+  - dbaron
+  - dholbert
+  - mstensho
diff --git a/testing/web-platform/tests/css/css-box/animation/margin-bottom-composition.html b/testing/web-platform/tests/css/css-box/animation/margin-bottom-composition.html
new file mode 100644
index 0000000000..c95f8de23e
--- /dev/null
+++ b/testing/web-platform/tests/css/css-box/animation/margin-bottom-composition.html
@@ -0,0 +1,78 @@
+<!DOCTYPE html>
+<meta charset="UTF-8">
+<title>margin-bottom composition</title>
+<link rel="help" href="https://www.w3.org/TR/CSS2/box.html#margin-properties">
+<meta name="assert" content="margin-bottom supports animation">
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/interpolation-testcommon.js"></script>
+
+<body>
+<script>
+test_composition({
+  property: 'margin-bottom',
+  underlying: '50px',
+  addFrom: '100px',
+  addTo: '200px',
+}, [
+  {at: -0.3, expect: '120px'},
+  {at: 0, expect: '150px'},
+  {at: 0.5, expect: '200px'},
+  {at: 1, expect: '250px'},
+  {at: 1.5, expect: '300px'},
+]);
+
+test_composition({
+  property: 'margin-bottom',
+  underlying: '100px',
+  addFrom: '10px',
+  addTo: '2px',
+}, [
+  {at: -0.5, expect: '114px'},
+  {at: 0, expect: '110px'},
+  {at: 0.5, expect: '106px'},
+  {at: 1, expect: '102px'},
+  {at: 1.5, expect: '98px'},
+]);
+
+test_composition({
+  property: 'margin-bottom',
+  underlying: '10%',
+  addFrom: '100px',
+  addTo: '20%',
+}, [
+  {at: -0.3, expect: 'calc(130px + 4%)'},
+  {at: 0, expect: 'calc(100px + 10%)'},
+  {at: 0.5, expect: 'calc(50px + 20%)'},
+  {at: 1, expect: '30%'},
+  {at: 1.5, expect: 'calc(-50px + 40%)'},
+]);
+
+test_composition({
+  property: 'margin-bottom',
+  underlying: '50px',
+  addFrom: '100px',
+  replaceTo: '200px',
+}, [
+  {at: -0.3, expect: '135px'},
+  {at: 0, expect: '150px'},
+  {at: 0.5, expect: '175px'},
+  {at: 1, expect: '200px'},
+  {at: 1.5, expect: '225px'},
+]);
+
+test_composition({
+  property: 'margin-bottom',
+  underlying: '100px',
+  addFrom: '100px',
+  addTo: 'auto',
+}, [
+  {at: -0.3, expect: '200px'},
+  {at: 0, expect: '200px'},
+  {at: 0.5, expect: 'auto'},
+  {at: 1, expect: 'auto'},
+  {at: 1.5, expect: 'auto'},
+]);
+</script>
+</body>
diff --git a/testing/web-platform/tests/css/css-box/animation/margin-interpolation.html b/testing/web-platform/tests/css/css-box/animation/margin-interpolation.html
new file mode 100644
index 0000000000..088836cbbd
--- /dev/null
+++ b/testing/web-platform/tests/css/css-box/animation/margin-interpolation.html
@@ -0,0 +1,118 @@
+<!DOCTYPE html>
+<meta charset="UTF-8">
+<title>margin interpolation</title>
+<link rel="help" href="https://www.w3.org/TR/CSS2/box.html#margin-properties">
+<meta name="assert" content="margin supports animation">
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/interpolation-testcommon.js"></script>
+
+<style>
+.parent {
+  margin: 10px;
+  border: solid;
+  display: inline-block;
+}
+
+.target {
+  width: 40px;
+  height: 40px;
+  background-color: black;
+  display: inline-block;
+  margin: 30px;
+  opacity: 0.5;
+}
+
+.expected {
+  background-color: green;
+}
+</style>
+
+<body>
+<template id="target-template">
+  <div>
+    <div class="target"></div>
+  </div>
+</template>
+
+<script>
+test_interpolation({
+  property: 'margin',
+  from: neutralKeyframe,
+  to: '20px',
+}, [
+  {at: -0.3, expect: '33px'},
+  {at: 0, expect: '30px'},
+  {at: 0.3, expect: '27px'},
+  {at: 0.6, expect: '24px'},
+  {at: 1, expect: '20px'},
+  {at: 1.5, expect: '15px'},
+]);
+
+test_interpolation({
+  property: 'margin',
+  from: 'initial',
+  to: '20px',
+}, [
+  {at: -0.3, expect: '-6px'},
+  {at: 0, expect: '0px'},
+  {at: 0.3, expect: '6px'},
+  {at: 0.6, expect: '12px'},
+  {at: 1, expect: '20px'},
+  {at: 1.5, expect: '30px'},
+]);
+
+test_interpolation({
+  property: 'margin',
+  from: 'inherit',
+  to: '20px',
+}, [
+  {at: -0.3, expect: '7px'},
+  {at: 0, expect: '10px'},
+  {at: 0.3, expect: '13px'},
+  {at: 0.6, expect: '16px'},
+  {at: 1, expect: '20px'},
+  {at: 1.5, expect: '25px'},
+]);
+
+test_interpolation({
+  property: 'margin',
+  from: 'unset',
+  to: '20px',
+}, [
+  {at: -0.3, expect: '-6px'},
+  {at: 0, expect: '0px'},
+  {at: 0.3, expect: '6px'},
+  {at: 0.6, expect: '12px'},
+  {at: 1, expect: '20px'},
+  {at: 1.5, expect: '30px'},
+]);
+
+test_interpolation({
+  property: 'margin',
+  from: '0px',
+  to: '10px'
+}, [
+  {at: -0.3, expect: '-3px'},
+  {at: 0, expect: '0px'},
+  {at: 0.3, expect: '3px'},
+  {at: 0.6, expect: '6px'},
+  {at: 1, expect: '10px'},
+  {at: 1.5, expect: '15px'}
+]);
+
+test_interpolation({
+  property: 'margin',
+  from: '20px 40px 60px 80px',
+  to: '30px 50px 70px 90px'
+}, [
+  {at: -0.3, expect: '17px 37px 57px 77px'},
+  {at: 0, expect: '20px 40px 60px 80px'},
+  {at: 0.3, expect: '23px 43px 63px 83px'},
+  {at: 0.6, expect: '26px 46px 66px 86px'},
+  {at: 1, expect: '30px 50px 70px 90px'},
+  {at: 1.5, expect: '35px 55px 75px 95px'}
+]);
+</script>
+</body>
diff --git a/testing/web-platform/tests/css/css-box/animation/margin-left-composition.html b/testing/web-platform/tests/css/css-box/animation/margin-left-composition.html
new file mode 100644
index 0000000000..8f3c646dfe
--- /dev/null
+++ b/testing/web-platform/tests/css/css-box/animation/margin-left-composition.html
@@ -0,0 +1,78 @@
+<!DOCTYPE html>
+<meta charset="UTF-8">
+<title>margin-left composition</title>
+<link rel="help" href="https://www.w3.org/TR/CSS2/box.html#margin-properties">
+<meta name="assert" content="margin-left supports animation">
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/interpolation-testcommon.js"></script>
+
+<body>
+<script>
+test_composition({
+  property: 'margin-left',
+  underlying: '50px',
+  addFrom: '100px',
+  addTo: '200px',
+}, [
+  {at: -0.3, expect: '120px'},
+  {at: 0, expect: '150px'},
+  {at: 0.5, expect: '200px'},
+  {at: 1, expect: '250px'},
+  {at: 1.5, expect: '300px'},
+]);
+
+test_composition({
+  property: 'margin-left',
+  underlying: '100px',
+  addFrom: '10px',
+  addTo: '2px',
+}, [
+  {at: -0.5, expect: '114px'},
+  {at: 0, expect: '110px'},
+  {at: 0.5, expect: '106px'},
+  {at: 1, expect: '102px'},
+  {at: 1.5, expect: '98px'},
+]);
+
+test_composition({
+  property: 'margin-left',
+  underlying: '10%',
+  addFrom: '100px',
+  addTo: '20%',
+}, [
+  {at: -0.3, expect: 'calc(130px + 4%)'},
+  {at: 0, expect: 'calc(100px + 10%)'},
+  {at: 0.5, expect: 'calc(50px + 20%)'},
+  {at: 1, expect: '30%'},
+  {at: 1.5, expect: 'calc(-50px + 40%)'},
+]);
+
+test_composition({
+  property: 'margin-left',
+  underlying: '50px',
+  addFrom: '100px',
+  replaceTo: '200px',
+}, [
+  {at: -0.3, expect: '135px'},
+  {at: 0, expect: '150px'},
+  {at: 0.5, expect: '175px'},
+  {at: 1, expect: '200px'},
+  {at: 1.5, expect: '225px'},
+]);
+
+test_composition({
+  property: 'margin-left',
+  underlying: '100px',
+  addFrom: '100px',
+  addTo: 'auto',
+}, [
+  {at: -0.3, expect: '200px'},
+  {at: 0, expect: '200px'},
+  {at: 0.5, expect: 'auto'},
+  {at: 1, expect: 'auto'},
+  {at: 1.5, expect: 'auto'},
+]);
+</script>
+</body>
diff --git a/testing/web-platform/tests/css/css-box/animation/margin-right-composition.html b/testing/web-platform/tests/css/css-box/animation/margin-right-composition.html
new file mode 100644
index 0000000000..c903303313
--- /dev/null
+++ b/testing/web-platform/tests/css/css-box/animation/margin-right-composition.html
@@ -0,0 +1,78 @@
+<!DOCTYPE html>
+<meta charset="UTF-8">
+<title>margin-right composition</title>
+<link rel="help" href="https://www.w3.org/TR/CSS2/box.html#margin-properties">
+<meta name="assert" content="margin-right supports animation">
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/interpolation-testcommon.js"></script>
+
+<body>
+<script>
+test_composition({
+  property: 'margin-right',
+  underlying: '50px',
+  addFrom: '100px',
+  addTo: '200px',
+}, [
+  {at: -0.3, expect: '120px'},
+  {at: 0, expect: '150px'},
+  {at: 0.5, expect: '200px'},
+  {at: 1, expect: '250px'},
+  {at: 1.5, expect: '300px'},
+]);
+
+test_composition({
+  property: 'margin-right',
+  underlying: '100px',
+  addFrom: '10px',
+  addTo: '2px',
+}, [
+  {at: -0.5, expect: '114px'},
+  {at: 0, expect: '110px'},
+  {at: 0.5, expect: '106px'},
+  {at: 1, expect: '102px'},
+  {at: 1.5, expect: '98px'},
+]);
+
+test_composition({
+  property: 'margin-right',
+  underlying: '10%',
+  addFrom: '100px',
+  addTo: '20%',
+}, [
+  {at: -0.3, expect: 'calc(130px + 4%)'},
+  {at: 0, expect: 'calc(100px + 10%)'},
+  {at: 0.5, expect: 'calc(50px + 20%)'},
+  {at: 1, expect: '30%'},
+  {at: 1.5, expect: 'calc(-50px + 40%)'},
+]);
+
+test_composition({
+  property: 'margin-right',
+  underlying: '50px',
+  addFrom: '100px',
+  replaceTo: '200px',
+}, [
+  {at: -0.3, expect: '135px'},
+  {at: 0, expect: '150px'},
+  {at: 0.5, expect: '175px'},
+  {at: 1, expect: '200px'},
+  {at: 1.5, expect: '225px'},
+]);
+
+test_composition({
+  property: 'margin-right',
+  underlying: '100px',
+  addFrom: '100px',
+  addTo: 'auto',
+}, [
+  {at: -0.3, expect: '200px'},
+  {at: 0, expect: '200px'},
+  {at: 0.5, expect: 'auto'},
+  {at: 1, expect: 'auto'},
+  {at: 1.5, expect: 'auto'},
+]);
+</script>
+</body>
diff --git a/testing/web-platform/tests/css/css-box/animation/margin-top-composition.html b/testing/web-platform/tests/css/css-box/animation/margin-top-composition.html
new file mode 100644
index 0000000000..5f050bd6c7
--- /dev/null
+++ b/testing/web-platform/tests/css/css-box/animation/margin-top-composition.html
@@ -0,0 +1,78 @@
+<!DOCTYPE html>
+<meta charset="UTF-8">
+<title>margin-top composition</title>
+<link rel="help" href="https://www.w3.org/TR/CSS2/box.html#margin-properties">
+<meta name="assert" content="margin-top supports animation">
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/interpolation-testcommon.js"></script>
+
+<body>
+<script>
+test_composition({
+  property: 'margin-top',
+  underlying: '50px',
+  addFrom: '100px',
+  addTo: '200px',
+}, [
+  {at: -0.3, expect: '120px'},
+  {at: 0, expect: '150px'},
+  {at: 0.5, expect: '200px'},
+  {at: 1, expect: '250px'},
+  {at: 1.5, expect: '300px'},
+]);
+
+test_composition({
+  property: 'margin-top',
+  underlying: '100px',
+  addFrom: '10px',
+  addTo: '2px',
+}, [
+  {at: -0.5, expect: '114px'},
+  {at: 0, expect: '110px'},
+  {at: 0.5, expect: '106px'},
+  {at: 1, expect: '102px'},
+  {at: 1.5, expect: '98px'},
+]);
+
+test_composition({
+  property: 'margin-top',
+  underlying: '10%',
+  addFrom: '100px',
+  addTo: '20%',
+}, [
+  {at: -0.3, expect: 'calc(130px + 4%)'},
+  {at: 0, expect: 'calc(100px + 10%)'},
+  {at: 0.5, expect: 'calc(50px + 20%)'},
+  {at: 1, expect: '30%'},
+  {at: 1.5, expect: 'calc(-50px + 40%)'},
+]);
+
+test_composition({
+  property: 'margin-top',
+  underlying: '50px',
+  addFrom: '100px',
+  replaceTo: '200px',
+}, [
+  {at: -0.3, expect: '135px'},
+  {at: 0, expect: '150px'},
+  {at: 0.5, expect: '175px'},
+  {at: 1, expect: '200px'},
+  {at: 1.5, expect: '225px'},
+]);
+
+test_composition({
+  property: 'margin-top',
+  underlying: '100px',
+  addFrom: '100px',
+  addTo: 'auto',
+}, [
+  {at: -0.3, expect: '200px'},
+  {at: 0, expect: '200px'},
+  {at: 0.5, expect: 'auto'},
+  {at: 1, expect: 'auto'},
+  {at: 1.5, expect: 'auto'},
+]);
+</script>
+</body>
diff --git a/testing/web-platform/tests/css/css-box/animation/padding-bottom-composition.html b/testing/web-platform/tests/css/css-box/animation/padding-bottom-composition.html
new file mode 100644
index 0000000000..855b5d3dc2
--- /dev/null
+++ b/testing/web-platform/tests/css/css-box/animation/padding-bottom-composition.html
@@ -0,0 +1,65 @@
+<!DOCTYPE html>
+<meta charset="UTF-8">
+<title>padding-bottom composition</title>
+<link rel="help" href="https://drafts.csswg.org/css-box-3/#padding-shorthand">
+<meta name="assert" content="padding-bottom supports animation as a list of lengths">
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/interpolation-testcommon.js"></script>
+
+<body>
+<script>
+test_composition({
+  property: 'padding-bottom',
+  underlying: '50px',
+  addFrom: '100px',
+  addTo: '200px',
+}, [
+  {at: -0.3, expect: '120px'},
+  {at: 0, expect: '150px'},
+  {at: 0.5, expect: '200px'},
+  {at: 1, expect: '250px'},
+  {at: 1.5, expect: '300px'},
+]);
+
+test_composition({
+  property: 'padding-bottom',
+  underlying: '100px',
+  addFrom: '10px',
+  addTo: '2px',
+}, [
+  {at: -0.5, expect: '114px'},
+  {at: 0, expect: '110px'},
+  {at: 0.5, expect: '106px'},
+  {at: 1, expect: '102px'},
+  {at: 1.5, expect: '98px'}, // Value clamping should happen after composition.
+]);
+
+test_composition({
+  property: 'padding-bottom',
+  underlying: '10%',
+  addFrom: '100px',
+  addTo: '20%',
+}, [
+  {at: -0.3, expect: 'calc(130px + 4%)'},
+  {at: 0, expect: 'calc(100px + 10%)'},
+  {at: 0.5, expect: 'calc(50px + 20%)'},
+  {at: 1, expect: '30%'},
+  {at: 1.5, expect: 'calc(-50px + 40%)'},
+]);
+
+test_composition({
+  property: 'padding-bottom',
+  underlying: '50px',
+  addFrom: '100px',
+  replaceTo: '200px',
+}, [
+  {at: -0.3, expect: '135px'},
+  {at: 0, expect: '150px'},
+  {at: 0.5, expect: '175px'},
+  {at: 1, expect: '200px'},
+  {at: 1.5, expect: '225px'},
+]);
+</script>
+</body>
diff --git a/testing/web-platform/tests/css/css-box/animation/padding-interpolation.html b/testing/web-platform/tests/css/css-box/animation/padding-interpolation.html
new file mode 100644
index 0000000000..3bf2841179
--- /dev/null
+++ b/testing/web-platform/tests/css/css-box/animation/padding-interpolation.html
@@ -0,0 +1,108 @@
+<!DOCTYPE html>
+<meta charset="UTF-8">
+<title>padding interpolation</title>
+<link rel="help" href="https://drafts.csswg.org/css-box-3/#padding-shorthand">
+<meta name="assert" content="padding supports animation as a list of lengths">
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/interpolation-testcommon.js"></script>
+
+<style>
+.parent {
+  padding: 30px;
+}
+.target {
+  width: 1px;
+  height: 1px;
+  background-color: black;
+  display: inline-block;
+  padding: 10px;
+}
+.expected {
+  background-color: green;
+  margin-right: 10px;
+}
+</style>
+
+<body></body>
+
+<script>
+test_interpolation({
+  property: 'padding',
+  from: neutralKeyframe,
+  to: '20px',
+}, [
+  {at: -0.3, expect: '7px'},
+  {at: 0, expect: '10px'},
+  {at: 0.3, expect: '13px'},
+  {at: 0.6, expect: '16px'},
+  {at: 1, expect: '20px'},
+  {at: 1.5, expect: '25px'},
+]);
+
+test_interpolation({
+  property: 'padding',
+  from: 'initial',
+  to: '20px',
+}, [
+  {at: -0.3, expect: '0px'},
+  {at: 0, expect: '0px'},
+  {at: 0.3, expect: '6px'},
+  {at: 0.6, expect: '12px'},
+  {at: 1, expect: '20px'},
+  {at: 1.5, expect: '30px'},
+]);
+
+test_interpolation({
+  property: 'padding',
+  from: 'inherit',
+  to: '20px',
+}, [
+  {at: -0.3, expect: '33px'},
+  {at: 0, expect: '30px'},
+  {at: 0.3, expect: '27px'},
+  {at: 0.6, expect: '24px'},
+  {at: 1, expect: '20px'},
+  {at: 1.5, expect: '15px'},
+]);
+
+test_interpolation({
+  property: 'padding',
+  from: 'unset',
+  to: '20px',
+}, [
+  {at: -0.3, expect: '0px'},
+  {at: 0, expect: '0px'},
+  {at: 0.3, expect: '6px'},
+  {at: 0.6, expect: '12px'},
+  {at: 1, expect: '20px'},
+  {at: 1.5, expect: '30px'},
+]);
+
+test_interpolation({
+  property: 'padding',
+  from: '0px',
+  to: '10px'
+}, [
+  {at: -0.3, expect: '0px'}, // CSS padding can't be negative.
+  {at: 0, expect: '0px'},
+  {at: 0.3, expect: '3px'},
+  {at: 0.6, expect: '6px'},
+  {at: 1, expect: '10px'},
+  {at: 1.5, expect: '15px'}
+]);
+
+test_interpolation({
+  property: 'padding',
+  from: '20px 40px 60px 80px',
+  to: '30px 50px 70px 90px'
+}, [
+  {at: -0.3, expect: '17px 37px 57px 77px'},
+  {at: 0, expect: '20px 40px 60px 80px'},
+  {at: 0.3, expect: '23px 43px 63px 83px'},
+  {at: 0.6, expect: '26px 46px 66px 86px'},
+  {at: 1, expect: '30px 50px 70px 90px'},
+  {at: 1.5, expect: '35px 55px 75px 95px'}
+]);
+</script>
diff --git a/testing/web-platform/tests/css/css-box/animation/padding-left-composition.html b/testing/web-platform/tests/css/css-box/animation/padding-left-composition.html
new file mode 100644
index 0000000000..417777ae25
--- /dev/null
+++ b/testing/web-platform/tests/css/css-box/animation/padding-left-composition.html
@@ -0,0 +1,65 @@
+<!DOCTYPE html>
+<meta charset="UTF-8">
+<title>padding-left composition</title>
+<link rel="help" href="https://drafts.csswg.org/css-box-3/#padding-shorthand">
+<meta name="assert" content="padding-left supports animation as a list of lengths">
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/interpolation-testcommon.js"></script>
+
+<body>
+<script>
+test_composition({
+  property: 'padding-left',
+  underlying: '50px',
+  addFrom: '100px',
+  addTo: '200px',
+}, [
+  {at: -0.3, expect: '120px'},
+  {at: 0, expect: '150px'},
+  {at: 0.5, expect: '200px'},
+  {at: 1, expect: '250px'},
+  {at: 1.5, expect: '300px'},
+]);
+
+test_composition({
+  property: 'padding-left',
+  underlying: '100px',
+  addFrom: '10px',
+  addTo: '2px',
+}, [
+  {at: -0.5, expect: '114px'},
+  {at: 0, expect: '110px'},
+  {at: 0.5, expect: '106px'},
+  {at: 1, expect: '102px'},
+  {at: 1.5, expect: '98px'}, // Value clamping should happen after composition.
+]);
+
+test_composition({
+  property: 'padding-left',
+  underlying: '10%',
+  addFrom: '100px',
+  addTo: '20%',
+}, [
+  {at: -0.3, expect: 'calc(130px + 4%)'},
+  {at: 0, expect: 'calc(100px + 10%)'},
+  {at: 0.5, expect: 'calc(50px + 20%)'},
+  {at: 1, expect: '30%'},
+  {at: 1.5, expect: 'calc(-50px + 40%)'},
+]);
+
+test_composition({
+  property: 'padding-left',
+  underlying: '50px',
+  addFrom: '100px',
+  replaceTo: '200px',
+}, [
+  {at: -0.3, expect: '135px'},
+  {at: 0, expect: '150px'},
+  {at: 0.5, expect: '175px'},
+  {at: 1, expect: '200px'},
+  {at: 1.5, expect: '225px'},
+]);
+</script>
+</body>
diff --git a/testing/web-platform/tests/css/css-box/animation/padding-right-composition.html b/testing/web-platform/tests/css/css-box/animation/padding-right-composition.html
new file mode 100644
index 0000000000..3c80849bb2
--- /dev/null
+++ b/testing/web-platform/tests/css/css-box/animation/padding-right-composition.html
@@ -0,0 +1,65 @@
+<!DOCTYPE html>
+<meta charset="UTF-8">
+<title>padding-right composition</title>
+<link rel="help" href="https://drafts.csswg.org/css-box-3/#padding-shorthand">
+<meta name="assert" content="padding-right supports animation as a list of lengths">
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/interpolation-testcommon.js"></script>
+
+<body>
+<script>
+test_composition({
+  property: 'padding-right',
+  underlying: '50px',
+  addFrom: '100px',
+  addTo: '200px',
+}, [
+  {at: -0.3, expect: '120px'},
+  {at: 0, expect: '150px'},
+  {at: 0.5, expect: '200px'},
+  {at: 1, expect: '250px'},
+  {at: 1.5, expect: '300px'},
+]);
+
+test_composition({
+  property: 'padding-right',
+  underlying: '100px',
+  addFrom: '10px',
+  addTo: '2px',
+}, [
+  {at: -0.5, expect: '114px'},
+  {at: 0, expect: '110px'},
+  {at: 0.5, expect: '106px'},
+  {at: 1, expect: '102px'},
+  {at: 1.5, expect: '98px'}, // Value clamping should happen after composition.
+]);
+
+test_composition({
+  property: 'padding-right',
+  underlying: '10%',
+  addFrom: '100px',
+  addTo: '20%',
+}, [
+  {at: -0.3, expect: 'calc(130px + 4%)'},
+  {at: 0, expect: 'calc(100px + 10%)'},
+  {at: 0.5, expect: 'calc(50px + 20%)'},
+  {at: 1, expect: '30%'},
+  {at: 1.5, expect: 'calc(-50px + 40%)'},
+]);
+
+test_composition({
+  property: 'padding-right',
+  underlying: '50px',
+  addFrom: '100px',
+  replaceTo: '200px',
+}, [
+  {at: -0.3, expect: '135px'},
+  {at: 0, expect: '150px'},
+  {at: 0.5, expect: '175px'},
+  {at: 1, expect: '200px'},
+  {at: 1.5, expect: '225px'},
+]);
+</script>
+</body>
diff --git a/testing/web-platform/tests/css/css-box/animation/padding-top-composition.html b/testing/web-platform/tests/css/css-box/animation/padding-top-composition.html
new file mode 100644
index 0000000000..b5083ae79b
--- /dev/null
+++ b/testing/web-platform/tests/css/css-box/animation/padding-top-composition.html
@@ -0,0 +1,65 @@
+<!DOCTYPE html>
+<meta charset="UTF-8">
+<title>padding-top composition</title>
+<link rel="help" href="https://drafts.csswg.org/css-box-3/#padding-shorthand">
+<meta name="assert" content="padding-top supports animation as a list of lengths">
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/interpolation-testcommon.js"></script>
+
+<body>
+<script>
+test_composition({
+  property: 'padding-top',
+  underlying: '50px',
+  addFrom: '100px',
+  addTo: '200px',
+}, [
+  {at: -0.3, expect: '120px'},
+  {at: 0, expect: '150px'},
+  {at: 0.5, expect: '200px'},
+  {at: 1, expect: '250px'},
+  {at: 1.5, expect: '300px'},
+]);
+
+test_composition({
+  property: 'padding-top',
+  underlying: '100px',
+  addFrom: '10px',
+  addTo: '2px',
+}, [
+  {at: -0.5, expect: '114px'},
+  {at: 0, expect: '110px'},
+  {at: 0.5, expect: '106px'},
+  {at: 1, expect: '102px'},
+  {at: 1.5, expect: '98px'}, // Value clamping should happen after composition.
+]);
+
+test_composition({
+  property: 'padding-top',
+  underlying: '10%',
+  addFrom: '100px',
+  addTo: '20%',
+}, [
+  {at: -0.3, expect: 'calc(130px + 4%)'},
+  {at: 0, expect: 'calc(100px + 10%)'},
+  {at: 0.5, expect: 'calc(50px + 20%)'},
+  {at: 1, expect: '30%'},
+  {at: 1.5, expect: 'calc(-50px + 40%)'},
+]);
+
+test_composition({
+  property: 'padding-top',
+  underlying: '50px',
+  addFrom: '100px',
+  replaceTo: '200px',
+}, [
+  {at: -0.3, expect: '135px'},
+  {at: 0, expect: '150px'},
+  {at: 0.5, expect: '175px'},
+  {at: 1, expect: '200px'},
+  {at: 1.5, expect: '225px'},
+]);
+</script>
+</body>
diff --git a/testing/web-platform/tests/css/css-box/box-chrome-crash-001.html b/testing/web-platform/tests/css/css-box/box-chrome-crash-001.html
new file mode 100644
index 0000000000..351df37f15
--- /dev/null
+++ b/testing/web-platform/tests/css/css-box/box-chrome-crash-001.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<title>CSS Box: chrome crash</title>
+<link rel="author" href="mailto:atotic@google.com">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<link rel="help" href="https://crbug.com/967361">
+<meta name="assert" content="Chrome does not crash on narrow div with scrollbars.">
+<style>
+body  {
+  writing-mode: vertical-lr;
+}
+#target {
+  overflow-y: scroll;
+  max-height: 5px;
+  background: gray;
+}
+</style>
+<!--  -->
+<div>
+  <span>
+    <div id="container">
+      <div id="target">anon</div>
+    </div>
+  </span>
+</div>
+
+<script>
+test(() => {
+}, 'test passes if it does not crash');
+</script>
diff --git a/testing/web-platform/tests/css/css-box/inheritance.html b/testing/web-platform/tests/css/css-box/inheritance.html
new file mode 100644
index 0000000000..bf10aeeb8e
--- /dev/null
+++ b/testing/web-platform/tests/css/css-box/inheritance.html
@@ -0,0 +1,35 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>Inheritance of CSS Box Model properties</title>
+<link rel="help" href="https://drafts.csswg.org/css-box-3/#property-index">
+<link rel="help" href="https://www.w3.org/TR/CSS2/">
+<meta name="assert" content="Properties do not inherit.">
+<meta name="assert" content="length-percentage properties have initial value 0.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/inheritance-testcommon.js"></script>
+</head>
+<body>
+<div id="container">
+  <div id="target"></div>
+</div>
+<script>
+assert_not_inherited('clear', 'none', 'right');
+assert_not_inherited('float', 'none', 'right');
+
+assert_not_inherited('margin-bottom', '0px', '10px');
+assert_not_inherited('margin-left', '0px', '10px');
+assert_not_inherited('margin-right', '0px', '10px');
+assert_not_inherited('margin-top', '0px', '10px');
+assert_not_inherited('margin-trim', 'none', 'block');
+assert_not_inherited('padding-bottom', '0px', '10px');
+assert_not_inherited('padding-left', '0px', '10px');
+assert_not_inherited('padding-right', '0px', '10px');
+assert_not_inherited('padding-top', '0px', '10px');
+
+assert_inherited('visibility', 'visible', 'collapse');
+</script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/css/css-box/margin-trim/block-container-block-001.html b/testing/web-platform/tests/css/css-box/margin-trim/block-container-block-001.html
new file mode 100644
index 0000000000..516a90cf65
--- /dev/null
+++ b/testing/web-platform/tests/css/css-box/margin-trim/block-container-block-001.html
@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<html>
+<head>
+<title>CSS margin-trim: block trim 001</title>
+<link rel="author" title="Sammy Gill" href="mailto:sammy.gill@apple.com">
+<link rel="help" href="https://drafts.csswg.org/css-box-4/#margin-trim-block">
+<link rel="match" href="/css/reference/ref-filled-green-100px-square-only.html">
+<meta name="assert" content="block should trim block start and end margins for block-level first child">
+<style>
+.container {
+    background-color: green;
+    width: 100px;
+    margin-trim: block;
+}
+.outer {
+    background-color: green;
+    width: 100px;
+    height: 50px;
+}
+.child {
+    margin-top: 50px;
+    margin-bottom: 50px;
+    height: 50px;
+}
+</style>
+</head>
+<body>
+    <p>Test passes if there is a filled green square.</p>
+    <div class="container">
+        <div class="child"></div>
+    </div>
+    <div class="outer"></div>
+</body>
+</html>
diff --git a/testing/web-platform/tests/css/css-box/margin-trim/block-container-block-002.html b/testing/web-platform/tests/css/css-box/margin-trim/block-container-block-002.html
new file mode 100644
index 0000000000..1f86d555bf
--- /dev/null
+++ b/testing/web-platform/tests/css/css-box/margin-trim/block-container-block-002.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html>
+<html>
+<head>
+<title>CSS margin-trim: block trim 002</title>
+<link rel="author" title="Sammy Gill" href="mailto:sammy.gill@apple.com">
+<link rel="help" href="https://drafts.csswg.org/css-box-4/#margin-trim-block">
+<link rel="match" href="/css/reference/ref-filled-green-100px-square-only.html">
+<meta name="assert" content="block should trim block start and end margins for ONLY block-level first/last children">
+<style>
+.container {
+    background-color: green;
+    width: 100px;
+    margin-trim: block;
+}
+.first {
+    margin-top: 50px;
+    height: 25px;
+}
+.second {
+    width: 100px;
+    height: 10px;
+    margin-bottom: 15px;
+}
+.third {
+    width: 100px;
+    height: 25px;
+    margin-bottom: 50px;
+}
+.outer {
+    width: 100px;
+    height: 25px;
+    background-color: green;
+}
+</style>
+</head>
+<body>
+    <p>Test passes if there is a filled green square.</p>
+    <div class="container">
+        <div class="first"></div>
+        <div class="second"></div>
+        <div class="third"></div>
+    </div>
+    <div class="outer"></div>
+</body>
+</html>
diff --git a/testing/web-platform/tests/css/css-box/margin-trim/block-container-block-end-001.html b/testing/web-platform/tests/css/css-box/margin-trim/block-container-block-end-001.html
new file mode 100644
index 0000000000..e36a207fb6
--- /dev/null
+++ b/testing/web-platform/tests/css/css-box/margin-trim/block-container-block-end-001.html
@@ -0,0 +1,33 @@
+<!DOCTYPE html>
+<html>
+<head>
+<title>CSS margin-trim: block end trim 001</title>
+<link rel="author" title="Sammy Gill" href="mailto:sammy.gill@apple.com">
+<link rel="help" href="https://drafts.csswg.org/css-box-4/#margin-trim-block">
+<link rel="match" href="/css/reference/ref-filled-green-100px-square-only.html">
+<meta name="assert" content="block-end should trim block end margin for block-level first child">
+<style>
+.container {
+    background-color: green;
+    width: 100px;
+    margin-trim: block-end;
+}
+.outer {
+    background-color: green;
+    width: 100px;
+    height: 50px;
+}
+.child {
+    margin-bottom: 50px;
+    height: 50px;
+}
+</style>
+</head>
+<body>
+    <p>Test passes if there is a filled green square.</p>
+    <div class="container">
+        <div class="child"></div>
+    </div>
+    <div class="outer"></div>
+</body>
+</html>
diff --git a/testing/web-platform/tests/css/css-box/margin-trim/block-container-block-end-002.html b/testing/web-platform/tests/css/css-box/margin-trim/block-container-block-end-002.html
new file mode 100644
index 0000000000..2859e10468
--- /dev/null
+++ b/testing/web-platform/tests/css/css-box/margin-trim/block-container-block-end-002.html
@@ -0,0 +1,40 @@
+<!DOCTYPE html>
+<html>
+<head>
+<title>CSS margin-trim: block end trim 002</title>
+<link rel="author" title="Sammy Gill" href="mailto:sammy.gill@apple.com">
+<link rel="help" href="https://drafts.csswg.org/css-box-4/#margin-trim-block">
+<link rel="match" href="/css/reference/ref-filled-green-100px-square-only.html">
+<meta name="assert" content="block-end should trim block end margin for ONLY block-level first child">
+<style>
+.container {
+    width: 100px;
+    margin-trim: block-end;
+    background-color: green;
+}
+.outer {
+    width: 100px;
+    height: 40px;
+    background-color: green;
+}
+.first {
+    width: 100%;
+    margin-bottom: 25px;
+    height: 25px;
+}
+.second {
+    margin-bottom: 100px;
+    width: 100%;
+    height: 10px;
+}
+</style>
+</head>
+<body>
+    <p>Test passes if there is a filled green square.</p>
+    <div class="container">
+        <div class="first"></div>
+        <div class="second"></div>
+    </div>
+    <div class="outer"></div>
+</body>
+</html>
diff --git a/testing/web-platform/tests/css/css-box/margin-trim/block-container-block-start-001.html b/testing/web-platform/tests/css/css-box/margin-trim/block-container-block-start-001.html
new file mode 100644
index 0000000000..2fecf07e64
--- /dev/null
+++ b/testing/web-platform/tests/css/css-box/margin-trim/block-container-block-start-001.html
@@ -0,0 +1,33 @@
+<!DOCTYPE html>
+<html>
+<head>
+<title>CSS margin-trim: block start trim 001</title>
+<link rel="author" title="Sammy Gill" href="mailto:sammy.gill@apple.com">
+<link rel="help" href="https://drafts.csswg.org/css-box-4/#margin-trim-block">
+<link rel="match" href="/css/reference/ref-filled-green-100px-square-only.html">
+<meta name="assert" content="block-start should trim block start margin for block-level first child">
+<style>
+.container {
+    background-color: green;
+    width: 100px;
+    margin-trim: block-start;
+}
+.outer {
+    background-color: green;
+    width: 100px;
+    height: 50px;
+}
+.child {
+    margin-top: 50px;
+    height: 50px;
+}
+</style>
+</head>
+<body>
+    <p>Test passes if there is a filled green square.</p>
+    <div class="outer"></div>
+    <div class="container">
+        <div class="child"></div>
+    </div>
+</body>
+</html>
diff --git a/testing/web-platform/tests/css/css-box/margin-trim/block-container-block-start-002.html b/testing/web-platform/tests/css/css-box/margin-trim/block-container-block-start-002.html
new file mode 100644
index 0000000000..6edbb54e94
--- /dev/null
+++ b/testing/web-platform/tests/css/css-box/margin-trim/block-container-block-start-002.html
@@ -0,0 +1,40 @@
+<!DOCTYPE html>
+<html>
+<head>
+<title>CSS margin-trim: block start trim 002</title>
+<link rel="author" title="Sammy Gill" href="mailto:sammy.gill@apple.com">
+<link rel="help" href="https://drafts.csswg.org/css-box-4/#margin-trim-block">
+<link rel="match" href="/css/reference/ref-filled-green-100px-square-only.html">
+<meta name="assert" content="block-start should trim block start margin for ONLY block-level first child">
+<style>
+.container {
+    background-color: green;
+    width: 100px;
+    margin-trim: block-start;
+}
+.outer {
+    background-color: green;
+    width: 100px;
+    height: 10px;
+}
+.first {
+    margin-top: 50px;
+    width: 100%;
+    height: 40px;
+}
+.second {
+    margin-top: 10px;
+    width: 100%;
+    height: 40px;
+}
+</style>
+</head>
+<body>
+    <p>Test passes if there is a filled green square.</p>
+    <div class="outer"></div>
+    <div class="container">
+        <div class="first"></div>
+        <div class="second"></div>
+    </div>
+</body>
+</html>
diff --git a/testing/web-platform/tests/css/css-box/margin-trim/block-container-replaced-block-end.html b/testing/web-platform/tests/css/css-box/margin-trim/block-container-replaced-block-end.html
new file mode 100644
index 0000000000..6011d10de5
--- /dev/null
+++ b/testing/web-platform/tests/css/css-box/margin-trim/block-container-replaced-block-end.html
@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<html>
+<head>
+<title>CSS margin-trim: block container replaced block-end trim</title>
+<link rel="author" title="Sammy Gill" href="mailto:sammy.gill@apple.com">
+<link rel="help" href="https://drafts.csswg.org/css-box-4/#margin-trim-block">
+<link rel="match" href="/css/reference/ref-filled-green-100px-square-only.html">
+<meta name="assert" content="block level replaced element should have block-end trimmed">
+<style>
+.container {
+   width: 100px;
+   margin-trim: block-end;
+}
+.outer {
+    background-color: green;
+    width: 100px;
+    height: 40px;
+}
+.child {
+    display: block;
+    margin-bottom: 50px;
+    background-color: green;
+    padding-right: 40px;
+}
+</style>
+</head>
+<body>
+    <p>Test passes if there is a filled green square.</p>
+    <div class="container">
+        <img class="child" src="/css/support/60x60-green.png"/>
+    </div>
+    <div class="outer"></div>
+</body>
+</html>
diff --git a/testing/web-platform/tests/css/css-box/margin-trim/block-container-replaced-block-start.html b/testing/web-platform/tests/css/css-box/margin-trim/block-container-replaced-block-start.html
new file mode 100644
index 0000000000..c943fb16bb
--- /dev/null
+++ b/testing/web-platform/tests/css/css-box/margin-trim/block-container-replaced-block-start.html
@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<html>
+<head>
+<title>CSS margin-trim: block container replaced block-start trim</title>
+<link rel="author" title="Sammy Gill" href="mailto:sammy.gill@apple.com">
+<link rel="help" href="https://drafts.csswg.org/css-box-4/#margin-trim-block">
+<link rel="match" href="/css/reference/ref-filled-green-100px-square-only.html">
+<meta name="assert" content="block level replaced element should have block-start trimmed">
+<style>
+.container {
+   width: 100px;
+   margin-trim: block-start;
+}
+.outer {
+    background-color: green;
+    width: 100px;
+    height: 40px;
+}
+.child {
+    display: block;
+    margin-top: 50px;
+    background-color: green;
+    padding-right: 40px;
+}
+</style>
+</head>
+<body>
+    <p>Test passes if there is a filled green square.</p>
+    <div class="outer"></div>
+    <div class="container">
+        <img class="child" src="/css/support/60x60-green.png"/>
+    </div>
+</body>
+</html>
diff --git a/testing/web-platform/tests/css/css-box/margin-trim/block-container-replaced-block.html b/testing/web-platform/tests/css/css-box/margin-trim/block-container-replaced-block.html
new file mode 100644
index 0000000000..54d701176c
--- /dev/null
+++ b/testing/web-platform/tests/css/css-box/margin-trim/block-container-replaced-block.html
@@ -0,0 +1,35 @@
+<!DOCTYPE html>
+<html>
+<head>
+<title>CSS margin-trim: block container replaced block trim</title>
+<link rel="author" title="Sammy Gill" href="mailto:sammy.gill@apple.com">
+<link rel="help" href="https://drafts.csswg.org/css-box-4/#margin-trim-block">
+<link rel="match" href="/css/reference/ref-filled-green-100px-square-only.html">
+<meta name="assert" content="block level replaced element should have both block-start and block-end trimmed when block is specified">
+<style>
+.container {
+    width: 100px;
+    margin-trim: block;
+}
+.outer {
+    background-color: green;
+    width: 100px;
+    height: 40px;
+}
+.child {
+    display: block;
+    margin-top: 50px;
+    margin-bottom: 50px;
+    background-color: green;
+    padding-right: 40px;
+}
+</style>
+</head>
+<body>
+    <p>Test passes if there is a filled green square.</p>
+    <div class="container">
+        <img class="child" src="/css/support/60x60-green.png"/>
+    </div>
+    <div class="outer"></div>
+</body>
+</html>
diff --git a/testing/web-platform/tests/css/css-box/parsing/clear-computed.html b/testing/web-platform/tests/css/css-box/parsing/clear-computed.html
new file mode 100644
index 0000000000..9571cb7e40
--- /dev/null
+++ b/testing/web-platform/tests/css/css-box/parsing/clear-computed.html
@@ -0,0 +1,24 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS basic box model: getComputedStyle().clear</title>
+<link rel="help" href="https://drafts.csswg.org/css-box-3/#propdef-clear">
+<link rel="help" href="https://drafts.csswg.org/css-logical/#float-clear">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/computed-testcommon.js"></script>
+</head>
+<body>
+<div id="target"></div>
+<script>
+test_computed_value("clear", "none");
+test_computed_value("clear", "left");
+test_computed_value("clear", "right");
+test_computed_value("clear", "both");
+
+test_computed_value("clear", "inline-start");
+test_computed_value("clear", "inline-end");
+</script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/css/css-box/parsing/clear-invalid.html b/testing/web-platform/tests/css/css-box/parsing/clear-invalid.html
new file mode 100644
index 0000000000..38d1821bc8
--- /dev/null
+++ b/testing/web-platform/tests/css/css-box/parsing/clear-invalid.html
@@ -0,0 +1,19 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS basic box model: parsing clear with invalid values</title>
+<link rel="author" title="Eric Willigers" href="mailto:ericwilligers@chromium.org">
+<link rel="help" href="https://drafts.csswg.org/css-box-3/#propdef-clear">
+<meta name="assert" content="clear supports only the grammar 'none | left | right | both'.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+</head>
+<body>
+<script>
+test_invalid_value("clear", "auto");
+test_invalid_value("clear", "left right");
+</script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/css/css-box/parsing/clear-valid.html b/testing/web-platform/tests/css/css-box/parsing/clear-valid.html
new file mode 100644
index 0000000000..fc1947f71d
--- /dev/null
+++ b/testing/web-platform/tests/css/css-box/parsing/clear-valid.html
@@ -0,0 +1,26 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS basic box model: parsing clear with valid values</title>
+<link rel="author" title="Eric Willigers" href="mailto:ericwilligers@chromium.org">
+<link rel="help" href="https://drafts.csswg.org/css-box-3/#propdef-clear">
+<link rel="help" href="https://drafts.csswg.org/css-logical/#float-clear">
+<meta name="assert" content="clear supports the full grammar 'none | left | right | both'.">
+<meta name="assert" content="clear also supports inline-start and inline-end.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+</head>
+<body>
+<script>
+test_valid_value("clear", "none");
+test_valid_value("clear", "left");
+test_valid_value("clear", "right");
+test_valid_value("clear", "both");
+
+test_valid_value("clear", "inline-start");
+test_valid_value("clear", "inline-end");
+</script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/css/css-box/parsing/float-computed.html b/testing/web-platform/tests/css/css-box/parsing/float-computed.html
new file mode 100644
index 0000000000..9d680e16c6
--- /dev/null
+++ b/testing/web-platform/tests/css/css-box/parsing/float-computed.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS basic box model: getComputedStyle().float</title>
+<link rel="help" href="https://drafts.csswg.org/css-box-3/#propdef-float">
+<link rel="help" href="https://drafts.csswg.org/css-logical/#float-clear">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/computed-testcommon.js"></script>
+</head>
+<body>
+<div id="target"></div>
+<script>
+test_computed_value("float", "none");
+test_computed_value("float", "left");
+test_computed_value("float", "right");
+
+test_computed_value("float", "inline-start");
+test_computed_value("float", "inline-end");
+</script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/css/css-box/parsing/float-invalid.html b/testing/web-platform/tests/css/css-box/parsing/float-invalid.html
new file mode 100644
index 0000000000..c11f4e2e66
--- /dev/null
+++ b/testing/web-platform/tests/css/css-box/parsing/float-invalid.html
@@ -0,0 +1,20 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS basic box model: parsing float with invalid values</title>
+<link rel="author" title="Eric Willigers" href="mailto:ericwilligers@chromium.org">
+<link rel="help" href="https://drafts.csswg.org/css-box-3/#propdef-float">
+<meta name="assert" content="float supports only the grammar 'left | right | top | bottom | start | end | none | <page-floats>'.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+</head>
+<body>
+<script>
+test_invalid_value("float", "auto");
+test_invalid_value("float", "right bottom");
+test_invalid_value("float", "top, left");
+</script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/css/css-box/parsing/float-valid.html b/testing/web-platform/tests/css/css-box/parsing/float-valid.html
new file mode 100644
index 0000000000..32cf7edefd
--- /dev/null
+++ b/testing/web-platform/tests/css/css-box/parsing/float-valid.html
@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS basic box model: parsing float with valid values</title>
+<link rel="author" title="Eric Willigers" href="mailto:ericwilligers@chromium.org">
+<link rel="help" href="https://drafts.csswg.org/css-box-3/#propdef-float">
+<link rel="help" href="https://drafts.csswg.org/css-logical/#float-clear">
+<meta name="assert" content="float supports the full grammar 'left | right | top | bottom | start | end | none | <page-floats>'.">
+<meta name="assert" content="float supports 'inline-start | inline-end'.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+</head>
+<body>
+<script>
+test_valid_value("float", "left");
+test_valid_value("float", "right");
+test_valid_value("float", "none");
+
+test_valid_value("float", "inline-start");
+test_valid_value("float", "inline-end");
+
+// The following are not yet supported by browsers:
+// test_valid_value("float", "top");
+// test_valid_value("float", "bottom");
+// test_valid_value("float", "start"); // not permitted in https://drafts.csswg.org/css-page-floats/#float-property
+// test_valid_value("float", "end"); // not permitted in https://drafts.csswg.org/css-page-floats/#float-property
+
+// Page floats are now defined in
+// https://drafts.csswg.org/css-page-floats/#float-property
+</script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/css/css-box/parsing/height-invalid.html b/testing/web-platform/tests/css/css-box/parsing/height-invalid.html
new file mode 100644
index 0000000000..dcd4d1afbe
--- /dev/null
+++ b/testing/web-platform/tests/css/css-box/parsing/height-invalid.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS basic box model: parsing height with invalid values</title>
+<link rel="author" title="Eric Willigers" href="mailto:ericwilligers@chromium.org">
+<link rel="help" href="https://drafts.csswg.org/css-box-3/#propdef-height">
+<meta name="assert" content="height supports only the grammar '[<length> | <percentage>] | available | min-content | max-content | fit-content | complex | auto'.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+</head>
+<body>
+<script>
+test_invalid_value("height", "none");
+
+test_invalid_value("height", "min-content available");
+test_invalid_value("height", "max-content 10px");
+test_invalid_value("height", "20% available");
+
+test_invalid_value("height", "-10px");
+test_invalid_value("height", "-20%");
+test_invalid_value("height", "60");
+test_invalid_value("height", "10px 20%");
+
+test_invalid_value("height", "10px border-box");
+test_invalid_value("height", "content-box 20%");
+</script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/css/css-box/parsing/height-valid.html b/testing/web-platform/tests/css/css-box/parsing/height-valid.html
new file mode 100644
index 0000000000..7cc09a594e
--- /dev/null
+++ b/testing/web-platform/tests/css/css-box/parsing/height-valid.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS basic box model: parsing height with valid values</title>
+<link rel="author" title="Eric Willigers" href="mailto:ericwilligers@chromium.org">
+<link rel="help" href="https://drafts.csswg.org/css-box-3/#propdef-height">
+<meta name="assert" content="height supports the full grammar '[<length> | <percentage>] | available | min-content | max-content | fit-content | complex | auto'.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+</head>
+<body>
+<script>
+test_valid_value("height", "auto");
+
+test_valid_value("height", "10px");
+test_valid_value("height", "20%");
+test_valid_value("height", "calc(2em + 3ex)");
+
+test_valid_value("height", "min-content");
+test_valid_value("height", "max-content");
+test_valid_value("height", "fit-content");
+
+// The following are not yet supported by browsers:
+// test_valid_value("height", "available");
+// test_valid_value("height", "complex");
+</script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/css/css-box/parsing/margin-computed.html b/testing/web-platform/tests/css/css-box/parsing/margin-computed.html
new file mode 100644
index 0000000000..6c3b321c72
--- /dev/null
+++ b/testing/web-platform/tests/css/css-box/parsing/margin-computed.html
@@ -0,0 +1,46 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS basic box model: getComputedStyle().margin</title>
+<link rel="help" href="https://drafts.csswg.org/css-box-3/#propdef-margin">
+<meta name="assert" content="margin computed value has absolute lengths.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/computed-testcommon.js"></script>
+<style>
+  #parent {
+    width: 200px;
+  }
+  #target {
+    width: 0px;
+    font-size: 40px;
+  }
+</style>
+</head>
+<body>
+<div id="parent">
+  <div id="target"></div>
+</div>
+<script>
+const target = document.getElementById("target");
+
+test_computed_value("margin", "10px");
+test_computed_value("margin", "10px 20px 30px 40px");
+test_computed_value("margin", "calc(0.5em + 10px)", "30px");
+test_computed_value("margin", "30%", "60px");
+
+// Since what should the margin be in presence of other margins is a bit
+// unclear (https://github.com/w3c/csswg-drafts/issues/2328), reset the margin
+// before testing.
+target.style.margin = "0";
+test_computed_value("margin-top", "10px");
+target.style.margin = "0";
+test_computed_value("margin-right", "20px");
+target.style.margin = "0";
+test_computed_value("margin-bottom", "30px");
+target.style.margin = "0";
+test_computed_value("margin-left", "40px");
+</script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/css/css-box/parsing/margin-invalid.html b/testing/web-platform/tests/css/css-box/parsing/margin-invalid.html
new file mode 100644
index 0000000000..7700917093
--- /dev/null
+++ b/testing/web-platform/tests/css/css-box/parsing/margin-invalid.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS basic box model: parsing margin with invalid values</title>
+<link rel="author" title="Eric Willigers" href="mailto:ericwilligers@chromium.org">
+<link rel="help" href="https://drafts.csswg.org/css-box-3/#propdef-margin">
+<meta name="assert" content="margin supports only the grammar '[ <length> | <percentage> | auto]{1,4}'.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+</head>
+<body>
+<script>
+test_invalid_value("margin", "available");
+test_invalid_value("margin", "10px border-box");
+test_invalid_value("margin", "1% 2% 3% 4% 5%");
+
+test_invalid_value("margin-top", "calc(2em + 3ex) auto");
+test_invalid_value("margin-right", "auto calc(2em + 3ex) 20%");
+test_invalid_value("margin-bottom", "10px 20% calc(2em + 3ex) auto");
+test_invalid_value("margin-bottom-left", "none");
+</script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/css/css-box/parsing/margin-shorthand.html b/testing/web-platform/tests/css/css-box/parsing/margin-shorthand.html
new file mode 100644
index 0000000000..293927983e
--- /dev/null
+++ b/testing/web-platform/tests/css/css-box/parsing/margin-shorthand.html
@@ -0,0 +1,43 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS basic box model: margin sets longhands</title>
+<link rel="help" href="https://drafts.csswg.org/css-box-3/#propdef-margin">
+<meta name="assert" content="margin supports the full grammar '<length-percentage>{1,4}'.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/shorthand-testcommon.js"></script>
+</head>
+<body>
+<script>
+test_shorthand_value('margin', '1px 2px 3px 4px', {
+  'margin-top': '1px',
+  'margin-right': '2px',
+  'margin-bottom': '3px',
+  'margin-left': '4px'
+});
+
+test_shorthand_value('margin', '1px 2px 3px', {
+  'margin-top': '1px',
+  'margin-right': '2px',
+  'margin-bottom': '3px',
+  'margin-left': '2px'
+});
+
+test_shorthand_value('margin', '1px 2px', {
+  'margin-top': '1px',
+  'margin-right': '2px',
+  'margin-bottom': '1px',
+  'margin-left': '2px'
+});
+
+test_shorthand_value('margin', '1px', {
+  'margin-top': '1px',
+  'margin-right': '1px',
+  'margin-bottom': '1px',
+  'margin-left': '1px'
+});
+</script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/css/css-box/parsing/margin-trim-computed.html b/testing/web-platform/tests/css/css-box/parsing/margin-trim-computed.html
new file mode 100644
index 0000000000..ad2d17f2ef
--- /dev/null
+++ b/testing/web-platform/tests/css/css-box/parsing/margin-trim-computed.html
@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS margin-trim computed style</title>
+<link rel="help" href="https://www.w3.org/TR/css-box-4/#margin-trim">
+<link rel="author" title="Sammy Gill" href="mailto:sammy.gill@apple.com">
+<meta name="assert" content="Test the computed values for margin-trim">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/computed-testcommon.js"></script>
+</head>
+<body>
+<div id="target"></div>
+<script>
+test_computed_value("margin-trim", "none");
+test_computed_value("margin-trim", "block");
+test_computed_value("margin-trim", "inline");
+test_computed_value("margin-trim", "block-start block-end", "block");
+test_computed_value("margin-trim", "inline-start inline-end", "inline");
+test_computed_value("margin-trim", "block-start");
+test_computed_value("margin-trim", "block-end");
+test_computed_value("margin-trim", "inline-start");
+test_computed_value("margin-trim", "inline-end");
+test_computed_value("margin-trim", "block-start inline-start");
+test_computed_value("margin-trim", "inline-start block-start", "block-start inline-start");
+test_computed_value("margin-trim", "inline-end block-start", "block-start inline-end");
+test_computed_value("margin-trim", "inline-end block-end", "block-end inline-end");
+test_computed_value("margin-trim", "block-start block-end inline-start", "block-start inline-start block-end");
+test_computed_value("margin-trim", "inline-start block-start inline-end block-end", "block-start inline-start block-end inline-end");
+test_computed_value("margin-trim", "inline-start inline-end block-start", "block-start inline-start inline-end");
+</script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/css/css-box/parsing/margin-trim.html b/testing/web-platform/tests/css/css-box/parsing/margin-trim.html
new file mode 100644
index 0000000000..0d92f80b9b
--- /dev/null
+++ b/testing/web-platform/tests/css/css-box/parsing/margin-trim.html
@@ -0,0 +1,46 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS margin-trim: property parsing</title>
+<link rel="help" href="https://www.w3.org/TR/css-box-4/#margin-trim">
+<link rel="author" title="Sammy Gill" href="mailto:sammy.gill@apple.com">
+<meta name="assert" content="Test parsing for the margin-trim property">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+</head>
+<body>
+<script>
+// Individual values should get set
+test_valid_value("margin-trim", "none");
+test_valid_value("margin-trim", "block");
+test_valid_value("margin-trim", "inline");
+test_valid_value("margin-trim", "block-start");
+test_valid_value("margin-trim", "block-end");
+test_valid_value("margin-trim", "inline-start");
+test_valid_value("margin-trim", "inline-end");
+
+// Serialize values into either block or inline
+test_valid_value("margin-trim", "block-start block-end", "block");
+test_valid_value("margin-trim", "inline-start inline-end", "inline");
+test_valid_value("margin-trim", "block-end block-start", "block");
+test_valid_value("margin-trim", "inline-end inline-start", "inline");
+test_valid_value("margin-trim", "inline-start block-start");
+
+test_valid_value("margin-trim", "inline-end block-start block-end");
+test_valid_value("margin-trim", "block-start inline-start block-end inline-end");
+test_valid_value("margin-trim", "inline-end block-end inline-start block-start");
+
+test_invalid_value("margin-trim", "block inline");
+test_invalid_value("margin-trim", "block block");
+test_invalid_value("margin-trim", "inline inline");
+test_invalid_value("margin-trim", "block inline-start inline-end");
+test_invalid_value("margin-trim", "block block-start block-end");
+test_invalid_value("margin-trim", "block-start block-end block");
+test_invalid_value("margin-trim", "block 10px");
+test_invalid_value("margin-trim", "auto");
+test_invalid_value("margin-trim", "left");
+</script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/css/css-box/parsing/margin-valid.html b/testing/web-platform/tests/css/css-box/parsing/margin-valid.html
new file mode 100644
index 0000000000..154aa2de7c
--- /dev/null
+++ b/testing/web-platform/tests/css/css-box/parsing/margin-valid.html
@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS basic box model: parsing margin with valid values</title>
+<link rel="author" title="Eric Willigers" href="mailto:ericwilligers@chromium.org">
+<link rel="help" href="https://drafts.csswg.org/css-box-3/#propdef-margin">
+<meta name="assert" content="margin supports the full grammar '[ <length> | <percentage> | auto]{1,4}'.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+</head>
+<body>
+<script>
+test_valid_value("margin", "10px");
+test_valid_value("margin", "20%");
+test_valid_value("margin", "calc(2em + 3ex)");
+test_valid_value("margin", "auto");
+test_valid_value("margin", "-10px");
+test_valid_value("margin", "-20%");
+
+test_valid_value("margin", "calc(2em + 3ex) auto");
+test_valid_value("margin", "auto calc(2em + 3ex) 20%");
+test_valid_value("margin", "10px 20% calc(2em + 3ex) auto");
+
+test_valid_value("margin-top", "10px");
+test_valid_value("margin-right", "20%");
+test_valid_value("margin-bottom", "calc(2em + 3ex)");
+test_valid_value("margin-left", "auto");
+test_valid_value("margin-top", "-10px");
+test_valid_value("margin-right", "-20%");
+</script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/css/css-box/parsing/max-height-invalid.html b/testing/web-platform/tests/css/css-box/parsing/max-height-invalid.html
new file mode 100644
index 0000000000..aeb6e64808
--- /dev/null
+++ b/testing/web-platform/tests/css/css-box/parsing/max-height-invalid.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS basic box model: parsing max-height with invalid values</title>
+<link rel="author" title="Eric Willigers" href="mailto:ericwilligers@chromium.org">
+<link rel="help" href="https://drafts.csswg.org/css-box-3/#propdef-max-height">
+<meta name="assert" content="max-height supports only the grammar '[ [<length> | <percentage>] && [border-box | content-box]? ] | available | min-content | max-content | fit-content | none'.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+</head>
+<body>
+<script>
+test_invalid_value("max-height", "complex");
+test_invalid_value("max-height", "auto");
+test_invalid_value("max-height", "none available");
+test_invalid_value("max-height", "max-content 10px");
+test_invalid_value("max-height", "20% available");
+
+test_invalid_value("max-height", "-10px");
+test_invalid_value("max-height", "-20%");
+test_invalid_value("max-height", "60");
+test_invalid_value("max-height", "10px 20%");
+test_invalid_value("max-height", "content-box border-box");
+test_invalid_value("max-height", "10px border-box 20%");
+test_invalid_value("max-height", "content-box 20% border-box");
+</script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/css/css-box/parsing/max-height-valid.html b/testing/web-platform/tests/css/css-box/parsing/max-height-valid.html
new file mode 100644
index 0000000000..04880c4903
--- /dev/null
+++ b/testing/web-platform/tests/css/css-box/parsing/max-height-valid.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS basic box model: parsing max-height with valid values</title>
+<link rel="author" title="Eric Willigers" href="mailto:ericwilligers@chromium.org">
+<link rel="help" href="https://drafts.csswg.org/css-box-3/#propdef-max-height">
+<meta name="assert" content="max-height supports the full grammar '[ [<length> | <percentage>] && [border-box | content-box]? ] | available | min-content | max-content | fit-content | none'.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+</head>
+<body>
+<script>
+test_valid_value("max-height", "none");
+
+test_valid_value("max-height", "10px");
+test_valid_value("max-height", "20%");
+test_valid_value("max-height", "calc(2em + 3ex)");
+
+test_valid_value("max-height", "min-content");
+test_valid_value("max-height", "max-content");
+test_valid_value("max-height", "fit-content");
+
+// The following are not yet supported by browsers:
+// test_valid_value("max-height", "available");
+// test_valid_value("max-height", "10px border-box");
+// test_valid_value("max-height", "content-box 20%", "20% content-box");
+</script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/css/css-box/parsing/max-width-invalid.html b/testing/web-platform/tests/css/css-box/parsing/max-width-invalid.html
new file mode 100644
index 0000000000..03db7e2657
--- /dev/null
+++ b/testing/web-platform/tests/css/css-box/parsing/max-width-invalid.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS basic box model: parsing max-width with invalid values</title>
+<link rel="author" title="Eric Willigers" href="mailto:ericwilligers@chromium.org">
+<link rel="help" href="https://drafts.csswg.org/css-box-3/#propdef-max-width">
+<meta name="assert" content="max-width supports only the grammar '[ [<length> | <percentage>] && [border-box | content-box]? ] | available | min-content | max-content | fit-content | none'.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+</head>
+<body>
+<script>
+test_invalid_value("max-width", "complex");
+test_invalid_value("max-width", "auto");
+test_invalid_value("max-width", "none available");
+test_invalid_value("max-width", "max-content 10px");
+test_invalid_value("max-width", "20% available");
+
+test_invalid_value("max-width", "-10px");
+test_invalid_value("max-width", "-20%");
+test_invalid_value("max-width", "60");
+test_invalid_value("max-width", "10px 20%");
+test_invalid_value("max-width", "content-box border-box");
+test_invalid_value("max-width", "10px border-box 20%");
+test_invalid_value("max-width", "content-box 20% border-box");
+</script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/css/css-box/parsing/max-width-valid.html b/testing/web-platform/tests/css/css-box/parsing/max-width-valid.html
new file mode 100644
index 0000000000..1e08a820d9
--- /dev/null
+++ b/testing/web-platform/tests/css/css-box/parsing/max-width-valid.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS basic box model: parsing max-width with valid values</title>
+<link rel="author" title="Eric Willigers" href="mailto:ericwilligers@chromium.org">
+<link rel="help" href="https://drafts.csswg.org/css-box-3/#propdef-max-width">
+<meta name="assert" content="max-width supports the full grammar '[ [<length> | <percentage>] && [border-box | content-box]? ] | available | min-content | max-content | fit-content | none'.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+</head>
+<body>
+<script>
+test_valid_value("max-width", "none");
+
+test_valid_value("max-width", "10px");
+test_valid_value("max-width", "20%");
+test_valid_value("max-width", "calc(2em + 3ex)");
+
+test_valid_value("max-width", "min-content");
+test_valid_value("max-width", "max-content");
+test_valid_value("max-width", "fit-content");
+
+// The following are not yet supported by browsers:
+// test_valid_value("max-width", "available");
+// test_valid_value("max-width", "10px border-box");
+// test_valid_value("max-width", "content-box 20%", "20% content-box");
+</script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/css/css-box/parsing/overflow-invalid.html b/testing/web-platform/tests/css/css-box/parsing/overflow-invalid.html
new file mode 100644
index 0000000000..4747764fb6
--- /dev/null
+++ b/testing/web-platform/tests/css/css-box/parsing/overflow-invalid.html
@@ -0,0 +1,24 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS basic box model: parsing overflow with invalid values</title>
+<link rel="author" title="Eric Willigers" href="mailto:ericwilligers@chromium.org">
+<link rel="help" href="https://drafts.csswg.org/css-box-3/#propdef-overflow">
+<meta name="assert" content="overflow supports only the grammar '[ visible | hidden | scroll | auto | no-display | no-content ]{1,2}'.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+</head>
+<body>
+<script>
+test_invalid_value("overflow", "none");
+test_invalid_value("overflow", "visible hidden scroll");
+test_invalid_value("overflow", "no-display, no-content");
+
+test_invalid_value("overflow-x", "none");
+test_invalid_value("overflow-y", "visible hidden");
+test_invalid_value("overflow-y", "no-display, no-content");
+</script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/css/css-box/parsing/overflow-valid.html b/testing/web-platform/tests/css/css-box/parsing/overflow-valid.html
new file mode 100644
index 0000000000..1bfeec2364
--- /dev/null
+++ b/testing/web-platform/tests/css/css-box/parsing/overflow-valid.html
@@ -0,0 +1,35 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS basic box model: parsing overflow with valid values</title>
+<link rel="author" title="Eric Willigers" href="mailto:ericwilligers@chromium.org">
+<link rel="help" href="https://drafts.csswg.org/css-box-3/#propdef-overflow">
+<meta name="assert" content="overflow supports the full grammar '[ visible | hidden | scroll | auto | no-display | no-content ]{1,2}'.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+</head>
+<body>
+<script>
+test_valid_value("overflow", "visible");
+test_valid_value("overflow", "hidden");
+test_valid_value("overflow", "scroll");
+test_valid_value("overflow", "auto");
+
+test_valid_value("overflow-x", "visible");
+test_valid_value("overflow-x", "hidden");
+test_valid_value("overflow-x", "scroll");
+test_valid_value("overflow-y", "auto");
+
+// The following are not yet supported by browsers:
+// test_valid_value("overflow", "no-display");
+// test_valid_value("overflow", "no-content");
+// test_valid_value("overflow", "visible hidden");
+// test_valid_value("overflow", "auto scroll");
+// test_valid_value("overflow", "no-display no-content");
+// test_valid_value("overflow-y", "no-display");
+// test_valid_value("overflow-y", "no-content");
+</script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/css/css-box/parsing/padding-computed.html b/testing/web-platform/tests/css/css-box/parsing/padding-computed.html
new file mode 100644
index 0000000000..f1186c4530
--- /dev/null
+++ b/testing/web-platform/tests/css/css-box/parsing/padding-computed.html
@@ -0,0 +1,51 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS basic box model: getComputedStyle().padding</title>
+<link rel="help" href="https://drafts.csswg.org/css-box-3/#propdef-padding">
+<link rel="help" href="https://drafts.csswg.org/cssom/#resolved-values">
+<meta name="assert" content="padding resolved value is an absolute length.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/computed-testcommon.js"></script>
+<style>
+  #container {
+    will-change: transform; /* containing block for #target */
+    width: 200px;
+  }
+  #parent {
+    width: 0px;
+  }
+  #target {
+    position: absolute;
+    font-size: 40px;
+  }
+</style>
+</head>
+<body>
+<div id="container">
+  <div id="parent">
+    <div id="target"></div>
+  </div>
+</div>
+<script>
+test_computed_value("padding", "10px");
+test_computed_value("padding", "10px 20px 30px 40px");
+
+test_computed_value("padding-top", "10px");
+test_computed_value("padding-right", "20px");
+test_computed_value("padding-bottom", "30px");
+test_computed_value("padding-left", "40px");
+
+test_computed_value("padding", "20%", "40px");
+test_computed_value("padding", "10px 20% 30% 40px", "10px 40px 60px");
+test_computed_value("padding-right", "20%", "40px");
+
+test_computed_value('padding-top', 'calc(10% - 40px)', '0px');
+test_computed_value('padding-right', 'calc(10% + 40px)', '60px');
+test_computed_value('padding-bottom', 'calc(10px - 0.5em)', '0px');
+test_computed_value('padding-left', 'calc(10px + 0.5em)', '30px');
+</script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/css/css-box/parsing/padding-invalid.html b/testing/web-platform/tests/css/css-box/parsing/padding-invalid.html
new file mode 100644
index 0000000000..3e3a560c2f
--- /dev/null
+++ b/testing/web-platform/tests/css/css-box/parsing/padding-invalid.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS basic box model: parsing padding with invalid values</title>
+<link rel="help" href="https://drafts.csswg.org/css-box-3/#propdef-padding">
+<meta name="assert" content="padding supports only the grammar '<length-percentage>{1,4}'.">
+<meta name="assert" content="Negative values are invalid.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+</head>
+<body>
+<script>
+test_invalid_value("padding", "auto");
+test_invalid_value("padding", "available");
+test_invalid_value("padding", "10px border-box");
+test_invalid_value("padding", "calc(2em + 3ex) auto");
+test_invalid_value("padding", "10px 20px 30px 40px 50px");
+
+test_invalid_value("padding-top", "auto");
+test_invalid_value("padding-bottom", "10px 20px calc(2em + 3ex) auto");
+test_invalid_value("padding-bottom-left", "10px 20px");
+
+test_invalid_value("padding-top", "-10px");
+test_invalid_value("padding-right", "-20%");
+</script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/css/css-box/parsing/padding-shorthand.html b/testing/web-platform/tests/css/css-box/parsing/padding-shorthand.html
new file mode 100644
index 0000000000..dc0139dc47
--- /dev/null
+++ b/testing/web-platform/tests/css/css-box/parsing/padding-shorthand.html
@@ -0,0 +1,43 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS basic box model: padding sets longhands</title>
+<link rel="help" href="https://drafts.csswg.org/css-box-3/#propdef-padding">
+<meta name="assert" content="padding supports the full grammar '<length-percentage>{1,4}'.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/shorthand-testcommon.js"></script>
+</head>
+<body>
+<script>
+test_shorthand_value('padding', '1px 2px 3px 4px', {
+  'padding-top': '1px',
+  'padding-right': '2px',
+  'padding-bottom': '3px',
+  'padding-left': '4px'
+});
+
+test_shorthand_value('padding', '1px 2px 3px', {
+  'padding-top': '1px',
+  'padding-right': '2px',
+  'padding-bottom': '3px',
+  'padding-left': '2px'
+});
+
+test_shorthand_value('padding', '1px 2px', {
+  'padding-top': '1px',
+  'padding-right': '2px',
+  'padding-bottom': '1px',
+  'padding-left': '2px'
+});
+
+test_shorthand_value('padding', '1px', {
+  'padding-top': '1px',
+  'padding-right': '1px',
+  'padding-bottom': '1px',
+  'padding-left': '1px'
+});
+</script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/css/css-box/parsing/padding-valid.html b/testing/web-platform/tests/css/css-box/parsing/padding-valid.html
new file mode 100644
index 0000000000..36d158b4d0
--- /dev/null
+++ b/testing/web-platform/tests/css/css-box/parsing/padding-valid.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS basic box model: parsing padding with valid values</title>
+<link rel="help" href="https://drafts.csswg.org/css-box-3/#propdef-padding">
+<meta name="assert" content="padding supports the full grammar '<length-percentage>{1,4}'.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+</head>
+<body>
+<script>
+test_valid_value("padding", "10px");
+test_valid_value("padding", "10px 20px 30px 40px");
+test_valid_value("padding", "calc(2em + 3ex)");
+
+test_valid_value("padding-top", "10px");
+test_valid_value("padding-right", "20px");
+test_valid_value("padding-bottom", "30px");
+test_valid_value("padding-left", "40px");
+
+test_valid_value("padding", "20%");
+test_valid_value("padding", "10px 20% 30% 40px");
+test_valid_value("padding-right", "20%");
+
+// https://drafts.csswg.org/css-values-4/#sort-a-calculations-children
+test_valid_value("padding-right", "calc(2em + 3%)", "calc(3% + 2em)");
+</script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/css/css-box/parsing/visibility-computed.html b/testing/web-platform/tests/css/css-box/parsing/visibility-computed.html
new file mode 100644
index 0000000000..f6d4c3f8e5
--- /dev/null
+++ b/testing/web-platform/tests/css/css-box/parsing/visibility-computed.html
@@ -0,0 +1,20 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS basic box model: getComputedStyle().visibility</title>
+<link rel="help" href="https://www.w3.org/TR/CSS2/visufx.html#visibility">
+<meta name="assert" content="visibility computed value is as specified.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/computed-testcommon.js"></script>
+</head>
+<body>
+<div id="target"></div>
+<script>
+test_computed_value("visibility", "visible");
+test_computed_value("visibility", "hidden");
+test_computed_value("visibility", "collapse");
+</script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/css/css-box/parsing/visibility-invalid.html b/testing/web-platform/tests/css/css-box/parsing/visibility-invalid.html
new file mode 100644
index 0000000000..73e611b2b8
--- /dev/null
+++ b/testing/web-platform/tests/css/css-box/parsing/visibility-invalid.html
@@ -0,0 +1,19 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS basic box model: parsing visibility with invalid values</title>
+<link rel="author" title="Eric Willigers" href="mailto:ericwilligers@chromium.org">
+<link rel="help" href="https://drafts.csswg.org/css-box-3/#propdef-visibility">
+<meta name="assert" content="visibility supports only the grammar 'visible | hidden | collapse'.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+</head>
+<body>
+<script>
+test_invalid_value("visibility", "auto");
+test_invalid_value("visibility", "hidden collapse");
+</script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/css/css-box/parsing/visibility-valid.html b/testing/web-platform/tests/css/css-box/parsing/visibility-valid.html
new file mode 100644
index 0000000000..2ab2f49660
--- /dev/null
+++ b/testing/web-platform/tests/css/css-box/parsing/visibility-valid.html
@@ -0,0 +1,20 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS basic box model: parsing visibility with valid values</title>
+<link rel="author" title="Eric Willigers" href="mailto:ericwilligers@chromium.org">
+<link rel="help" href="https://drafts.csswg.org/css-box-3/#propdef-visibility">
+<meta name="assert" content="visibility supports the full grammar 'visible | hidden | collapse'.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+</head>
+<body>
+<script>
+test_valid_value("visibility", "visible");
+test_valid_value("visibility", "hidden");
+test_valid_value("visibility", "collapse");
+</script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/css/css-box/parsing/width-invalid.html b/testing/web-platform/tests/css/css-box/parsing/width-invalid.html
new file mode 100644
index 0000000000..5a0145fe1d
--- /dev/null
+++ b/testing/web-platform/tests/css/css-box/parsing/width-invalid.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS basic box model: parsing width with invalid values</title>
+<link rel="author" title="Eric Willigers" href="mailto:ericwilligers@chromium.org">
+<link rel="help" href="https://drafts.csswg.org/css-box-3/#propdef-width">
+<meta name="assert" content="width supports only the grammar '[<length> | <percentage>] | available | min-content | max-content | fit-content | auto'.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+</head>
+<body>
+<script>
+test_invalid_value("width", "complex");
+test_invalid_value("width", "none");
+
+test_invalid_value("width", "min-content available");
+test_invalid_value("width", "max-content 10px");
+test_invalid_value("width", "20% available");
+
+test_invalid_value("width", "-10px");
+test_invalid_value("width", "-20%");
+test_invalid_value("width", "60");
+test_invalid_value("width", "10px 20%");
+
+test_invalid_value("width", "10px border-box");
+test_invalid_value("width", "content-box 20%");
+</script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/css/css-box/parsing/width-valid.html b/testing/web-platform/tests/css/css-box/parsing/width-valid.html
new file mode 100644
index 0000000000..93059bd2d3
--- /dev/null
+++ b/testing/web-platform/tests/css/css-box/parsing/width-valid.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS basic box model: parsing width with valid values</title>
+<link rel="author" title="Eric Willigers" href="mailto:ericwilligers@chromium.org">
+<link rel="help" href="https://drafts.csswg.org/css-box-3/#propdef-width">
+<meta name="assert" content="width supports the full grammar '[<length> | <percentage>] | available | min-content | max-content | fit-content | auto'.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+</head>
+<body>
+<script>
+test_valid_value("width", "auto");
+
+test_valid_value("width", "10px");
+test_valid_value("width", "20%");
+test_valid_value("width", "calc(2em + 3ex)");
+
+test_valid_value("width", "min-content");
+test_valid_value("width", "max-content");
+test_valid_value("width", "fit-content");
+
+// The following is not yet supported by browsers:
+// test_valid_value("width", "available");
+</script>
+</body>
+</html>
-- 
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