Adding upstream version 110.0.1.upstream/110.0.1 upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
author: Daniel Baumann <daniel.baumann@progress-linux.org> 2024-04-07 09:22:09 +0000
committer: Daniel Baumann <daniel.baumann@progress-linux.org> 2024-04-07 09:22:09 +0000
commit: 43a97878ce14b72f0981164f87f2e35e14151312 (patch)
tree: 620249daf56c0258faa40cbdcf9cfba06de2a846 /testing/web-platform/tests/html/canvas/offscreen/shadows
parent: Initial commit. (diff)
download: firefox-43a97878ce14b72f0981164f87f2e35e14151312.tar.xz
firefox-43a97878ce14b72f0981164f87f2e35e14151312.zip
112 files changed, 3994 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.alpha.1.html b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.alpha.1.html
new file mode 100644
index 0000000000..cf887b62a2
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.alpha.1.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.shadow.alpha.1</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+
+<h1>2d.shadow.alpha.1</h1>
+<p class="desc">Shadow color alpha components are used</p>
+
+
+<script>
+var t = async_test("Shadow color alpha components are used");
+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.fillStyle = '#0f0';
+ctx.fillRect(0, 0, 100, 50);
+ctx.shadowColor = 'rgba(255, 0, 0, 0.01)';
+ctx.shadowOffsetY = 50;
+ctx.fillRect(0, -50, 100, 50);
+_assertPixelApprox(canvas, 50,25, 0,255,0,255, 4);
+t.done();
+
+});
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.alpha.1.worker.js b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.alpha.1.worker.js
new file mode 100644
index 0000000000..7bcf74463c
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.alpha.1.worker.js
@@ -0,0 +1,28 @@
+// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
+// OffscreenCanvas test in a worker:2d.shadow.alpha.1
+// Description:Shadow color alpha components are used
+// Note:
+
+importScripts("/resources/testharness.js");
+importScripts("/html/canvas/resources/canvas-tests.js");
+
+var t = async_test("Shadow color alpha components are used");
+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.fillStyle = '#0f0';
+ctx.fillRect(0, 0, 100, 50);
+ctx.shadowColor = 'rgba(255, 0, 0, 0.01)';
+ctx.shadowOffsetY = 50;
+ctx.fillRect(0, -50, 100, 50);
+_assertPixelApprox(canvas, 50,25, 0,255,0,255, 4);
+t.done();
+
+});
+done();
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.alpha.2.html b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.alpha.2.html
new file mode 100644
index 0000000000..cb03866bc3
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.alpha.2.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.shadow.alpha.2</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+
+<h1>2d.shadow.alpha.2</h1>
+<p class="desc">Shadow color alpha components are used</p>
+
+
+<script>
+var t = async_test("Shadow color alpha components are used");
+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.fillStyle = '#f00';
+ctx.fillRect(0, 0, 100, 50);
+ctx.shadowColor = 'rgba(0, 0, 255, 0.5)';
+ctx.shadowOffsetY = 50;
+ctx.fillRect(0, -50, 100, 50);
+_assertPixelApprox(canvas, 50,25, 127,0,127,255, 2);
+t.done();
+
+});
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.alpha.2.worker.js b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.alpha.2.worker.js
new file mode 100644
index 0000000000..8f4b98143b
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.alpha.2.worker.js
@@ -0,0 +1,28 @@
+// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
+// OffscreenCanvas test in a worker:2d.shadow.alpha.2
+// Description:Shadow color alpha components are used
+// Note:
+
+importScripts("/resources/testharness.js");
+importScripts("/html/canvas/resources/canvas-tests.js");
+
+var t = async_test("Shadow color alpha components are used");
+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.fillStyle = '#f00';
+ctx.fillRect(0, 0, 100, 50);
+ctx.shadowColor = 'rgba(0, 0, 255, 0.5)';
+ctx.shadowOffsetY = 50;
+ctx.fillRect(0, -50, 100, 50);
+_assertPixelApprox(canvas, 50,25, 127,0,127,255, 2);
+t.done();
+
+});
+done();
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.alpha.3.html b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.alpha.3.html
new file mode 100644
index 0000000000..efc9fca97e
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.alpha.3.html
@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>OffscreenCanvas test: 2d.shadow.alpha.3</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+
+<h1>2d.shadow.alpha.3</h1>
+<p class="desc">Shadows are affected by globalAlpha</p>
+
+
+<script>
+var t = async_test("Shadows are affected by globalAlpha");
+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.fillStyle = '#f00';
+ctx.fillRect(0, 0, 100, 50);
+ctx.fillStyle = '#f00'; // (work around broken Firefox globalAlpha caching)
+ctx.shadowColor = '#00f';
+ctx.shadowOffsetY = 50;
+ctx.globalAlpha = 0.5;
+ctx.fillRect(0, -50, 100, 50);
+_assertPixelApprox(canvas, 50,25, 127,0,127,255, 2);
+t.done();
+
+});
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.alpha.3.worker.js b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.alpha.3.worker.js
new file mode 100644
index 0000000000..ddaae242d9
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.alpha.3.worker.js
@@ -0,0 +1,30 @@
+// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
+// OffscreenCanvas test in a worker:2d.shadow.alpha.3
+// Description:Shadows are affected by globalAlpha
+// Note:
+
+importScripts("/resources/testharness.js");
+importScripts("/html/canvas/resources/canvas-tests.js");
+
+var t = async_test("Shadows are affected by globalAlpha");
+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.fillStyle = '#f00';
+ctx.fillRect(0, 0, 100, 50);
+ctx.fillStyle = '#f00'; // (work around broken Firefox globalAlpha caching)
+ctx.shadowColor = '#00f';
+ctx.shadowOffsetY = 50;
+ctx.globalAlpha = 0.5;
+ctx.fillRect(0, -50, 100, 50);
+_assertPixelApprox(canvas, 50,25, 127,0,127,255, 2);
+t.done();
+
+});
+done();
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.alpha.4.html b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.alpha.4.html
new file mode 100644
index 0000000000..295b61269c
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.alpha.4.html
@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>OffscreenCanvas test: 2d.shadow.alpha.4</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+
+<h1>2d.shadow.alpha.4</h1>
+<p class="desc">Shadows with alpha components are correctly affected by globalAlpha</p>
+
+
+<script>
+var t = async_test("Shadows with alpha components are correctly affected by globalAlpha");
+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.fillStyle = '#f00';
+ctx.fillRect(0, 0, 100, 50);
+ctx.fillStyle = '#f00'; // (work around broken Firefox globalAlpha caching)
+ctx.shadowColor = 'rgba(0, 0, 255, 0.707)';
+ctx.shadowOffsetY = 50;
+ctx.globalAlpha = 0.707;
+ctx.fillRect(0, -50, 100, 50);
+_assertPixelApprox(canvas, 50,25, 127,0,127,255, 2);
+t.done();
+
+});
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.alpha.4.worker.js b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.alpha.4.worker.js
new file mode 100644
index 0000000000..16defd9094
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.alpha.4.worker.js
@@ -0,0 +1,30 @@
+// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
+// OffscreenCanvas test in a worker:2d.shadow.alpha.4
+// Description:Shadows with alpha components are correctly affected by globalAlpha
+// Note:
+
+importScripts("/resources/testharness.js");
+importScripts("/html/canvas/resources/canvas-tests.js");
+
+var t = async_test("Shadows with alpha components are correctly affected by globalAlpha");
+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.fillStyle = '#f00';
+ctx.fillRect(0, 0, 100, 50);
+ctx.fillStyle = '#f00'; // (work around broken Firefox globalAlpha caching)
+ctx.shadowColor = 'rgba(0, 0, 255, 0.707)';
+ctx.shadowOffsetY = 50;
+ctx.globalAlpha = 0.707;
+ctx.fillRect(0, -50, 100, 50);
+_assertPixelApprox(canvas, 50,25, 127,0,127,255, 2);
+t.done();
+
+});
+done();
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.alpha.5.html b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.alpha.5.html
new file mode 100644
index 0000000000..3b1089d7d7
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.alpha.5.html
@@ -0,0 +1,33 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>OffscreenCanvas test: 2d.shadow.alpha.5</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+
+<h1>2d.shadow.alpha.5</h1>
+<p class="desc">Shadows of shapes with alpha components are drawn correctly</p>
+
+
+<script>
+var t = async_test("Shadows of shapes with alpha components are drawn correctly");
+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.fillStyle = '#f00';
+ctx.fillRect(0, 0, 100, 50);
+ctx.fillStyle = 'rgba(64, 0, 0, 0.5)';
+ctx.shadowColor = '#00f';
+ctx.shadowOffsetY = 50;
+ctx.fillRect(0, -50, 100, 50);
+_assertPixelApprox(canvas, 50,25, 127,0,127,255, 2);
+t.done();
+
+});
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.alpha.5.worker.js b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.alpha.5.worker.js
new file mode 100644
index 0000000000..5437c65ec1
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.alpha.5.worker.js
@@ -0,0 +1,29 @@
+// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
+// OffscreenCanvas test in a worker:2d.shadow.alpha.5
+// Description:Shadows of shapes with alpha components are drawn correctly
+// Note:
+
+importScripts("/resources/testharness.js");
+importScripts("/html/canvas/resources/canvas-tests.js");
+
+var t = async_test("Shadows of shapes with alpha components are drawn correctly");
+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.fillStyle = '#f00';
+ctx.fillRect(0, 0, 100, 50);
+ctx.fillStyle = 'rgba(64, 0, 0, 0.5)';
+ctx.shadowColor = '#00f';
+ctx.shadowOffsetY = 50;
+ctx.fillRect(0, -50, 100, 50);
+_assertPixelApprox(canvas, 50,25, 127,0,127,255, 2);
+t.done();
+
+});
+done();
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.attributes.shadowBlur.initial.html b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.attributes.shadowBlur.initial.html
new file mode 100644
index 0000000000..e6c4c2fda8
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.attributes.shadowBlur.initial.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>OffscreenCanvas test: 2d.shadow.attributes.shadowBlur.initial</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+
+<h1>2d.shadow.attributes.shadowBlur.initial</h1>
+<p class="desc"></p>
+
+
+<script>
+var t = async_test("");
+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');
+
+_assertSame(ctx.shadowBlur, 0, "ctx.shadowBlur", "0");
+t.done();
+
+});
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.attributes.shadowBlur.initial.worker.js b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.attributes.shadowBlur.initial.worker.js
new file mode 100644
index 0000000000..9cf55e796b
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.attributes.shadowBlur.initial.worker.js
@@ -0,0 +1,23 @@
+// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
+// OffscreenCanvas test in a worker:2d.shadow.attributes.shadowBlur.initial
+// Description:
+// Note:
+
+importScripts("/resources/testharness.js");
+importScripts("/html/canvas/resources/canvas-tests.js");
+
+var t = async_test("");
+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');
+
+_assertSame(ctx.shadowBlur, 0, "ctx.shadowBlur", "0");
+t.done();
+
+});
+done();
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.attributes.shadowBlur.invalid.html b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.attributes.shadowBlur.invalid.html
new file mode 100644
index 0000000000..a506da4b8b
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.attributes.shadowBlur.invalid.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.shadow.attributes.shadowBlur.invalid</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+
+<h1>2d.shadow.attributes.shadowBlur.invalid</h1>
+<p class="desc"></p>
+
+
+<script>
+var t = async_test("");
+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.shadowBlur = 1;
+ctx.shadowBlur = -2;
+_assertSame(ctx.shadowBlur, 1, "ctx.shadowBlur", "1");
+ctx.shadowBlur = 1;
+ctx.shadowBlur = Infinity;
+_assertSame(ctx.shadowBlur, 1, "ctx.shadowBlur", "1");
+ctx.shadowBlur = 1;
+ctx.shadowBlur = -Infinity;
+_assertSame(ctx.shadowBlur, 1, "ctx.shadowBlur", "1");
+ctx.shadowBlur = 1;
+ctx.shadowBlur = NaN;
+_assertSame(ctx.shadowBlur, 1, "ctx.shadowBlur", "1");
+t.done();
+
+});
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.attributes.shadowBlur.invalid.worker.js b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.attributes.shadowBlur.invalid.worker.js
new file mode 100644
index 0000000000..1f79c36d12
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.attributes.shadowBlur.invalid.worker.js
@@ -0,0 +1,34 @@
+// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
+// OffscreenCanvas test in a worker:2d.shadow.attributes.shadowBlur.invalid
+// Description:
+// Note:
+
+importScripts("/resources/testharness.js");
+importScripts("/html/canvas/resources/canvas-tests.js");
+
+var t = async_test("");
+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.shadowBlur = 1;
+ctx.shadowBlur = -2;
+_assertSame(ctx.shadowBlur, 1, "ctx.shadowBlur", "1");
+ctx.shadowBlur = 1;
+ctx.shadowBlur = Infinity;
+_assertSame(ctx.shadowBlur, 1, "ctx.shadowBlur", "1");
+ctx.shadowBlur = 1;
+ctx.shadowBlur = -Infinity;
+_assertSame(ctx.shadowBlur, 1, "ctx.shadowBlur", "1");
+ctx.shadowBlur = 1;
+ctx.shadowBlur = NaN;
+_assertSame(ctx.shadowBlur, 1, "ctx.shadowBlur", "1");
+t.done();
+
+});
+done();
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.attributes.shadowBlur.valid.html b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.attributes.shadowBlur.valid.html
new file mode 100644
index 0000000000..b69b9c4717
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.attributes.shadowBlur.valid.html
@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>OffscreenCanvas test: 2d.shadow.attributes.shadowBlur.valid</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+
+<h1>2d.shadow.attributes.shadowBlur.valid</h1>
+<p class="desc"></p>
+
+
+<script>
+var t = async_test("");
+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.shadowBlur = 1;
+_assertSame(ctx.shadowBlur, 1, "ctx.shadowBlur", "1");
+ctx.shadowBlur = 0.5;
+_assertSame(ctx.shadowBlur, 0.5, "ctx.shadowBlur", "0.5");
+ctx.shadowBlur = 1e6;
+_assertSame(ctx.shadowBlur, 1e6, "ctx.shadowBlur", "1e6");
+ctx.shadowBlur = 0;
+_assertSame(ctx.shadowBlur, 0, "ctx.shadowBlur", "0");
+t.done();
+
+});
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.attributes.shadowBlur.valid.worker.js b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.attributes.shadowBlur.valid.worker.js
new file mode 100644
index 0000000000..b41fa24905
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.attributes.shadowBlur.valid.worker.js
@@ -0,0 +1,30 @@
+// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
+// OffscreenCanvas test in a worker:2d.shadow.attributes.shadowBlur.valid
+// Description:
+// Note:
+
+importScripts("/resources/testharness.js");
+importScripts("/html/canvas/resources/canvas-tests.js");
+
+var t = async_test("");
+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.shadowBlur = 1;
+_assertSame(ctx.shadowBlur, 1, "ctx.shadowBlur", "1");
+ctx.shadowBlur = 0.5;
+_assertSame(ctx.shadowBlur, 0.5, "ctx.shadowBlur", "0.5");
+ctx.shadowBlur = 1e6;
+_assertSame(ctx.shadowBlur, 1e6, "ctx.shadowBlur", "1e6");
+ctx.shadowBlur = 0;
+_assertSame(ctx.shadowBlur, 0, "ctx.shadowBlur", "0");
+t.done();
+
+});
+done();
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.attributes.shadowColor.initial.html b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.attributes.shadowColor.initial.html
new file mode 100644
index 0000000000..44a25308ac
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.attributes.shadowColor.initial.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>OffscreenCanvas test: 2d.shadow.attributes.shadowColor.initial</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+
+<h1>2d.shadow.attributes.shadowColor.initial</h1>
+<p class="desc"></p>
+
+
+<script>
+var t = async_test("");
+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');
+
+_assertSame(ctx.shadowColor, 'rgba(0, 0, 0, 0)', "ctx.shadowColor", "'rgba(0, 0, 0, 0)'");
+t.done();
+
+});
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.attributes.shadowColor.initial.worker.js b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.attributes.shadowColor.initial.worker.js
new file mode 100644
index 0000000000..f8132d5385
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.attributes.shadowColor.initial.worker.js
@@ -0,0 +1,23 @@
+// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
+// OffscreenCanvas test in a worker:2d.shadow.attributes.shadowColor.initial
+// Description:
+// Note:
+
+importScripts("/resources/testharness.js");
+importScripts("/html/canvas/resources/canvas-tests.js");
+
+var t = async_test("");
+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');
+
+_assertSame(ctx.shadowColor, 'rgba(0, 0, 0, 0)', "ctx.shadowColor", "'rgba(0, 0, 0, 0)'");
+t.done();
+
+});
+done();
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.attributes.shadowColor.invalid.html b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.attributes.shadowColor.invalid.html
new file mode 100644
index 0000000000..ed09bcbdcf
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.attributes.shadowColor.invalid.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.shadow.attributes.shadowColor.invalid</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+
+<h1>2d.shadow.attributes.shadowColor.invalid</h1>
+<p class="desc"></p>
+
+
+<script>
+var t = async_test("");
+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.shadowColor = '#00ff00';
+ctx.shadowColor = 'bogus';
+_assertSame(ctx.shadowColor, '#00ff00', "ctx.shadowColor", "'#00ff00'");
+ctx.shadowColor = '#00ff00';
+ctx.shadowColor = 'red bogus';
+_assertSame(ctx.shadowColor, '#00ff00', "ctx.shadowColor", "'#00ff00'");
+ctx.shadowColor = '#00ff00';
+ctx.shadowColor = ctx;
+_assertSame(ctx.shadowColor, '#00ff00', "ctx.shadowColor", "'#00ff00'");
+ctx.shadowColor = '#00ff00';
+ctx.shadowColor = undefined;
+_assertSame(ctx.shadowColor, '#00ff00', "ctx.shadowColor", "'#00ff00'");
+t.done();
+
+});
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.attributes.shadowColor.invalid.worker.js b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.attributes.shadowColor.invalid.worker.js
new file mode 100644
index 0000000000..b1003718c5
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.attributes.shadowColor.invalid.worker.js
@@ -0,0 +1,34 @@
+// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
+// OffscreenCanvas test in a worker:2d.shadow.attributes.shadowColor.invalid
+// Description:
+// Note:
+
+importScripts("/resources/testharness.js");
+importScripts("/html/canvas/resources/canvas-tests.js");
+
+var t = async_test("");
+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.shadowColor = '#00ff00';
+ctx.shadowColor = 'bogus';
+_assertSame(ctx.shadowColor, '#00ff00', "ctx.shadowColor", "'#00ff00'");
+ctx.shadowColor = '#00ff00';
+ctx.shadowColor = 'red bogus';
+_assertSame(ctx.shadowColor, '#00ff00', "ctx.shadowColor", "'#00ff00'");
+ctx.shadowColor = '#00ff00';
+ctx.shadowColor = ctx;
+_assertSame(ctx.shadowColor, '#00ff00', "ctx.shadowColor", "'#00ff00'");
+ctx.shadowColor = '#00ff00';
+ctx.shadowColor = undefined;
+_assertSame(ctx.shadowColor, '#00ff00', "ctx.shadowColor", "'#00ff00'");
+t.done();
+
+});
+done();
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.attributes.shadowColor.valid.html b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.attributes.shadowColor.valid.html
new file mode 100644
index 0000000000..9511027b5a
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.attributes.shadowColor.valid.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>OffscreenCanvas test: 2d.shadow.attributes.shadowColor.valid</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+
+<h1>2d.shadow.attributes.shadowColor.valid</h1>
+<p class="desc"></p>
+
+
+<script>
+var t = async_test("");
+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.shadowColor = 'lime';
+_assertSame(ctx.shadowColor, '#00ff00', "ctx.shadowColor", "'#00ff00'");
+ctx.shadowColor = 'RGBA(0,255, 0,0)';
+_assertSame(ctx.shadowColor, 'rgba(0, 255, 0, 0)', "ctx.shadowColor", "'rgba(0, 255, 0, 0)'");
+t.done();
+
+});
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.attributes.shadowColor.valid.worker.js b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.attributes.shadowColor.valid.worker.js
new file mode 100644
index 0000000000..f47e3660b5
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.attributes.shadowColor.valid.worker.js
@@ -0,0 +1,26 @@
+// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
+// OffscreenCanvas test in a worker:2d.shadow.attributes.shadowColor.valid
+// Description:
+// Note:
+
+importScripts("/resources/testharness.js");
+importScripts("/html/canvas/resources/canvas-tests.js");
+
+var t = async_test("");
+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.shadowColor = 'lime';
+_assertSame(ctx.shadowColor, '#00ff00', "ctx.shadowColor", "'#00ff00'");
+ctx.shadowColor = 'RGBA(0,255, 0,0)';
+_assertSame(ctx.shadowColor, 'rgba(0, 255, 0, 0)', "ctx.shadowColor", "'rgba(0, 255, 0, 0)'");
+t.done();
+
+});
+done();
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.attributes.shadowOffset.initial.html b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.attributes.shadowOffset.initial.html
new file mode 100644
index 0000000000..e568569a58
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.attributes.shadowOffset.initial.html
@@ -0,0 +1,28 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>OffscreenCanvas test: 2d.shadow.attributes.shadowOffset.initial</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+
+<h1>2d.shadow.attributes.shadowOffset.initial</h1>
+<p class="desc"></p>
+
+
+<script>
+var t = async_test("");
+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');
+
+_assertSame(ctx.shadowOffsetX, 0, "ctx.shadowOffsetX", "0");
+_assertSame(ctx.shadowOffsetY, 0, "ctx.shadowOffsetY", "0");
+t.done();
+
+});
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.attributes.shadowOffset.initial.worker.js b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.attributes.shadowOffset.initial.worker.js
new file mode 100644
index 0000000000..af2e77f464
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.attributes.shadowOffset.initial.worker.js
@@ -0,0 +1,24 @@
+// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
+// OffscreenCanvas test in a worker:2d.shadow.attributes.shadowOffset.initial
+// Description:
+// Note:
+
+importScripts("/resources/testharness.js");
+importScripts("/html/canvas/resources/canvas-tests.js");
+
+var t = async_test("");
+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');
+
+_assertSame(ctx.shadowOffsetX, 0, "ctx.shadowOffsetX", "0");
+_assertSame(ctx.shadowOffsetY, 0, "ctx.shadowOffsetY", "0");
+t.done();
+
+});
+done();
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.attributes.shadowOffset.invalid.html b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.attributes.shadowOffset.invalid.html
new file mode 100644
index 0000000000..58c8efec20
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.attributes.shadowOffset.invalid.html
@@ -0,0 +1,44 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>OffscreenCanvas test: 2d.shadow.attributes.shadowOffset.invalid</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+
+<h1>2d.shadow.attributes.shadowOffset.invalid</h1>
+<p class="desc"></p>
+
+
+<script>
+var t = async_test("");
+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.shadowOffsetX = 1;
+ctx.shadowOffsetY = 2;
+ctx.shadowOffsetX = Infinity;
+ctx.shadowOffsetY = Infinity;
+_assertSame(ctx.shadowOffsetX, 1, "ctx.shadowOffsetX", "1");
+_assertSame(ctx.shadowOffsetY, 2, "ctx.shadowOffsetY", "2");
+ctx.shadowOffsetX = 1;
+ctx.shadowOffsetY = 2;
+ctx.shadowOffsetX = -Infinity;
+ctx.shadowOffsetY = -Infinity;
+_assertSame(ctx.shadowOffsetX, 1, "ctx.shadowOffsetX", "1");
+_assertSame(ctx.shadowOffsetY, 2, "ctx.shadowOffsetY", "2");
+ctx.shadowOffsetX = 1;
+ctx.shadowOffsetY = 2;
+ctx.shadowOffsetX = NaN;
+ctx.shadowOffsetY = NaN;
+_assertSame(ctx.shadowOffsetX, 1, "ctx.shadowOffsetX", "1");
+_assertSame(ctx.shadowOffsetY, 2, "ctx.shadowOffsetY", "2");
+t.done();
+
+});
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.attributes.shadowOffset.invalid.worker.js b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.attributes.shadowOffset.invalid.worker.js
new file mode 100644
index 0000000000..892614781a
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.attributes.shadowOffset.invalid.worker.js
@@ -0,0 +1,40 @@
+// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
+// OffscreenCanvas test in a worker:2d.shadow.attributes.shadowOffset.invalid
+// Description:
+// Note:
+
+importScripts("/resources/testharness.js");
+importScripts("/html/canvas/resources/canvas-tests.js");
+
+var t = async_test("");
+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.shadowOffsetX = 1;
+ctx.shadowOffsetY = 2;
+ctx.shadowOffsetX = Infinity;
+ctx.shadowOffsetY = Infinity;
+_assertSame(ctx.shadowOffsetX, 1, "ctx.shadowOffsetX", "1");
+_assertSame(ctx.shadowOffsetY, 2, "ctx.shadowOffsetY", "2");
+ctx.shadowOffsetX = 1;
+ctx.shadowOffsetY = 2;
+ctx.shadowOffsetX = -Infinity;
+ctx.shadowOffsetY = -Infinity;
+_assertSame(ctx.shadowOffsetX, 1, "ctx.shadowOffsetX", "1");
+_assertSame(ctx.shadowOffsetY, 2, "ctx.shadowOffsetY", "2");
+ctx.shadowOffsetX = 1;
+ctx.shadowOffsetY = 2;
+ctx.shadowOffsetX = NaN;
+ctx.shadowOffsetY = NaN;
+_assertSame(ctx.shadowOffsetX, 1, "ctx.shadowOffsetX", "1");
+_assertSame(ctx.shadowOffsetY, 2, "ctx.shadowOffsetY", "2");
+t.done();
+
+});
+done();
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.attributes.shadowOffset.valid.html b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.attributes.shadowOffset.valid.html
new file mode 100644
index 0000000000..1ad622c468
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.attributes.shadowOffset.valid.html
@@ -0,0 +1,46 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>OffscreenCanvas test: 2d.shadow.attributes.shadowOffset.valid</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+
+<h1>2d.shadow.attributes.shadowOffset.valid</h1>
+<p class="desc"></p>
+
+
+<script>
+var t = async_test("");
+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.shadowOffsetX = 1;
+ctx.shadowOffsetY = 2;
+_assertSame(ctx.shadowOffsetX, 1, "ctx.shadowOffsetX", "1");
+_assertSame(ctx.shadowOffsetY, 2, "ctx.shadowOffsetY", "2");
+ctx.shadowOffsetX = 0.5;
+ctx.shadowOffsetY = 0.25;
+_assertSame(ctx.shadowOffsetX, 0.5, "ctx.shadowOffsetX", "0.5");
+_assertSame(ctx.shadowOffsetY, 0.25, "ctx.shadowOffsetY", "0.25");
+ctx.shadowOffsetX = -0.5;
+ctx.shadowOffsetY = -0.25;
+_assertSame(ctx.shadowOffsetX, -0.5, "ctx.shadowOffsetX", "-0.5");
+_assertSame(ctx.shadowOffsetY, -0.25, "ctx.shadowOffsetY", "-0.25");
+ctx.shadowOffsetX = 0;
+ctx.shadowOffsetY = 0;
+_assertSame(ctx.shadowOffsetX, 0, "ctx.shadowOffsetX", "0");
+_assertSame(ctx.shadowOffsetY, 0, "ctx.shadowOffsetY", "0");
+ctx.shadowOffsetX = 1e6;
+ctx.shadowOffsetY = 1e6;
+_assertSame(ctx.shadowOffsetX, 1e6, "ctx.shadowOffsetX", "1e6");
+_assertSame(ctx.shadowOffsetY, 1e6, "ctx.shadowOffsetY", "1e6");
+t.done();
+
+});
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.attributes.shadowOffset.valid.worker.js b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.attributes.shadowOffset.valid.worker.js
new file mode 100644
index 0000000000..eed84b54e5
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.attributes.shadowOffset.valid.worker.js
@@ -0,0 +1,42 @@
+// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
+// OffscreenCanvas test in a worker:2d.shadow.attributes.shadowOffset.valid
+// Description:
+// Note:
+
+importScripts("/resources/testharness.js");
+importScripts("/html/canvas/resources/canvas-tests.js");
+
+var t = async_test("");
+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.shadowOffsetX = 1;
+ctx.shadowOffsetY = 2;
+_assertSame(ctx.shadowOffsetX, 1, "ctx.shadowOffsetX", "1");
+_assertSame(ctx.shadowOffsetY, 2, "ctx.shadowOffsetY", "2");
+ctx.shadowOffsetX = 0.5;
+ctx.shadowOffsetY = 0.25;
+_assertSame(ctx.shadowOffsetX, 0.5, "ctx.shadowOffsetX", "0.5");
+_assertSame(ctx.shadowOffsetY, 0.25, "ctx.shadowOffsetY", "0.25");
+ctx.shadowOffsetX = -0.5;
+ctx.shadowOffsetY = -0.25;
+_assertSame(ctx.shadowOffsetX, -0.5, "ctx.shadowOffsetX", "-0.5");
+_assertSame(ctx.shadowOffsetY, -0.25, "ctx.shadowOffsetY", "-0.25");
+ctx.shadowOffsetX = 0;
+ctx.shadowOffsetY = 0;
+_assertSame(ctx.shadowOffsetX, 0, "ctx.shadowOffsetX", "0");
+_assertSame(ctx.shadowOffsetY, 0, "ctx.shadowOffsetY", "0");
+ctx.shadowOffsetX = 1e6;
+ctx.shadowOffsetY = 1e6;
+_assertSame(ctx.shadowOffsetX, 1e6, "ctx.shadowOffsetX", "1e6");
+_assertSame(ctx.shadowOffsetY, 1e6, "ctx.shadowOffsetY", "1e6");
+t.done();
+
+});
+done();
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.canvas.alpha.html b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.canvas.alpha.html
new file mode 100644
index 0000000000..5fea8a7cf3
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.canvas.alpha.html
@@ -0,0 +1,36 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>OffscreenCanvas test: 2d.shadow.canvas.alpha</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+
+<h1>2d.shadow.canvas.alpha</h1>
+<p class="desc">Shadows are drawn correctly for partially-transparent canvases</p>
+
+
+<script>
+var t = async_test("Shadows are drawn correctly for partially-transparent canvases");
+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');
+
+var offscreenCanvas2 = new OffscreenCanvas(100, 50);
+var ctx2 = offscreenCanvas2.getContext('2d');
+ctx2.fillStyle = 'rgba(255, 0, 0, 0.5)';
+ctx2.fillRect(0, 0, 100, 50);
+ctx.fillStyle = '#f00';
+ctx.fillRect(0, 0, 100, 50);
+ctx.shadowOffsetY = 50;
+ctx.shadowColor = '#00f';
+ctx.drawImage(offscreenCanvas2, 0, -50);
+_assertPixelApprox(canvas, 50,25, 127,0,127,255, 2);
+t.done();
+
+});
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.canvas.alpha.worker.js b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.canvas.alpha.worker.js
new file mode 100644
index 0000000000..663e89f284
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.canvas.alpha.worker.js
@@ -0,0 +1,32 @@
+// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
+// OffscreenCanvas test in a worker:2d.shadow.canvas.alpha
+// Description:Shadows are drawn correctly for partially-transparent canvases
+// Note:
+
+importScripts("/resources/testharness.js");
+importScripts("/html/canvas/resources/canvas-tests.js");
+
+var t = async_test("Shadows are drawn correctly for partially-transparent canvases");
+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');
+
+var offscreenCanvas2 = new OffscreenCanvas(100, 50);
+var ctx2 = offscreenCanvas2.getContext('2d');
+ctx2.fillStyle = 'rgba(255, 0, 0, 0.5)';
+ctx2.fillRect(0, 0, 100, 50);
+ctx.fillStyle = '#f00';
+ctx.fillRect(0, 0, 100, 50);
+ctx.shadowOffsetY = 50;
+ctx.shadowColor = '#00f';
+ctx.drawImage(offscreenCanvas2, 0, -50);
+_assertPixelApprox(canvas, 50,25, 127,0,127,255, 2);
+t.done();
+
+});
+done();
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.canvas.basic.html b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.canvas.basic.html
new file mode 100644
index 0000000000..2fc6b547d5
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.canvas.basic.html
@@ -0,0 +1,36 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>OffscreenCanvas test: 2d.shadow.canvas.basic</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+
+<h1>2d.shadow.canvas.basic</h1>
+<p class="desc">Shadows are drawn for canvases</p>
+
+
+<script>
+var t = async_test("Shadows are drawn for canvases");
+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');
+
+var offscreenCanvas2 = new OffscreenCanvas(100, 50);
+var ctx2 = offscreenCanvas2.getContext('2d');
+ctx2.fillStyle = '#f00';
+ctx2.fillRect(0, 0, 100, 50);
+ctx.fillStyle = '#f00';
+ctx.fillRect(0, 0, 100, 50);
+ctx.shadowColor = '#0f0';
+ctx.shadowOffsetY = 50;
+ctx.drawImage(offscreenCanvas2, 0, -50);
+_assertPixel(canvas, 50,25, 0,255,0,255);
+t.done();
+
+});
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.canvas.basic.worker.js b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.canvas.basic.worker.js
new file mode 100644
index 0000000000..20c433b2f6
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.canvas.basic.worker.js
@@ -0,0 +1,32 @@
+// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
+// OffscreenCanvas test in a worker:2d.shadow.canvas.basic
+// Description:Shadows are drawn for canvases
+// Note:
+
+importScripts("/resources/testharness.js");
+importScripts("/html/canvas/resources/canvas-tests.js");
+
+var t = async_test("Shadows are drawn for canvases");
+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');
+
+var offscreenCanvas2 = new OffscreenCanvas(100, 50);
+var ctx2 = offscreenCanvas2.getContext('2d');
+ctx2.fillStyle = '#f00';
+ctx2.fillRect(0, 0, 100, 50);
+ctx.fillStyle = '#f00';
+ctx.fillRect(0, 0, 100, 50);
+ctx.shadowColor = '#0f0';
+ctx.shadowOffsetY = 50;
+ctx.drawImage(offscreenCanvas2, 0, -50);
+_assertPixel(canvas, 50,25, 0,255,0,255);
+t.done();
+
+});
+done();
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.canvas.transparent.1.html b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.canvas.transparent.1.html
new file mode 100644
index 0000000000..1bfcb3bf3b
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.canvas.transparent.1.html
@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>OffscreenCanvas test: 2d.shadow.canvas.transparent.1</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+
+<h1>2d.shadow.canvas.transparent.1</h1>
+<p class="desc">Shadows are not drawn for transparent canvases</p>
+
+
+<script>
+var t = async_test("Shadows are not drawn for transparent canvases");
+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');
+
+var offscreenCanvas2 = new OffscreenCanvas(100, 50);
+var ctx2 = offscreenCanvas2.getContext('2d');
+ctx.fillStyle = '#0f0';
+ctx.fillRect(0, 0, 100, 50);
+ctx.shadowColor = '#f00';
+ctx.shadowOffsetY = 50;
+ctx.drawImage(offscreenCanvas2, 0, -50);
+_assertPixel(canvas, 50,25, 0,255,0,255);
+t.done();
+
+});
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.canvas.transparent.1.worker.js b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.canvas.transparent.1.worker.js
new file mode 100644
index 0000000000..413ba6b243
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.canvas.transparent.1.worker.js
@@ -0,0 +1,30 @@
+// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
+// OffscreenCanvas test in a worker:2d.shadow.canvas.transparent.1
+// Description:Shadows are not drawn for transparent canvases
+// Note:
+
+importScripts("/resources/testharness.js");
+importScripts("/html/canvas/resources/canvas-tests.js");
+
+var t = async_test("Shadows are not drawn for transparent canvases");
+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');
+
+var offscreenCanvas2 = new OffscreenCanvas(100, 50);
+var ctx2 = offscreenCanvas2.getContext('2d');
+ctx.fillStyle = '#0f0';
+ctx.fillRect(0, 0, 100, 50);
+ctx.shadowColor = '#f00';
+ctx.shadowOffsetY = 50;
+ctx.drawImage(offscreenCanvas2, 0, -50);
+_assertPixel(canvas, 50,25, 0,255,0,255);
+t.done();
+
+});
+done();
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.canvas.transparent.2.html b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.canvas.transparent.2.html
new file mode 100644
index 0000000000..6d30dfcb85
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.canvas.transparent.2.html
@@ -0,0 +1,42 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>OffscreenCanvas test: 2d.shadow.canvas.transparent.2</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+
+<h1>2d.shadow.canvas.transparent.2</h1>
+<p class="desc">Shadows are not drawn for transparent parts of canvases</p>
+
+
+<script>
+var t = async_test("Shadows are not drawn for transparent parts of canvases");
+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');
+
+var offscreenCanvas2 = new OffscreenCanvas(100, 50);
+var ctx2 = offscreenCanvas2.getContext('2d');
+ctx2.fillStyle = '#f00';
+ctx2.fillRect(0, 0, 50, 50);
+ctx.fillStyle = '#0f0';
+ctx.fillRect(0, 0, 50, 50);
+ctx.fillStyle = '#f00';
+ctx.fillRect(50, 0, 50, 50);
+ctx.shadowOffsetY = 50;
+ctx.shadowColor = '#0f0';
+ctx.drawImage(offscreenCanvas2, 50, -50);
+ctx.shadowColor = '#f00';
+ctx.drawImage(offscreenCanvas2, -50, -50);
+_assertPixel(canvas, 25,25, 0,255,0,255);
+_assertPixel(canvas, 50,25, 0,255,0,255);
+_assertPixel(canvas, 75,25, 0,255,0,255);
+t.done();
+
+});
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.canvas.transparent.2.worker.js b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.canvas.transparent.2.worker.js
new file mode 100644
index 0000000000..d702ded746
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.canvas.transparent.2.worker.js
@@ -0,0 +1,38 @@
+// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
+// OffscreenCanvas test in a worker:2d.shadow.canvas.transparent.2
+// Description:Shadows are not drawn for transparent parts of canvases
+// Note:
+
+importScripts("/resources/testharness.js");
+importScripts("/html/canvas/resources/canvas-tests.js");
+
+var t = async_test("Shadows are not drawn for transparent parts of canvases");
+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');
+
+var offscreenCanvas2 = new OffscreenCanvas(100, 50);
+var ctx2 = offscreenCanvas2.getContext('2d');
+ctx2.fillStyle = '#f00';
+ctx2.fillRect(0, 0, 50, 50);
+ctx.fillStyle = '#0f0';
+ctx.fillRect(0, 0, 50, 50);
+ctx.fillStyle = '#f00';
+ctx.fillRect(50, 0, 50, 50);
+ctx.shadowOffsetY = 50;
+ctx.shadowColor = '#0f0';
+ctx.drawImage(offscreenCanvas2, 50, -50);
+ctx.shadowColor = '#f00';
+ctx.drawImage(offscreenCanvas2, -50, -50);
+_assertPixel(canvas, 25,25, 0,255,0,255);
+_assertPixel(canvas, 50,25, 0,255,0,255);
+_assertPixel(canvas, 75,25, 0,255,0,255);
+t.done();
+
+});
+done();
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.clip.1.html b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.clip.1.html
new file mode 100644
index 0000000000..4beb1214b2
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.clip.1.html
@@ -0,0 +1,40 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>OffscreenCanvas test: 2d.shadow.clip.1</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+
+<h1>2d.shadow.clip.1</h1>
+<p class="desc">Shadows of clipped shapes are still drawn within the clipping region</p>
+
+
+<script>
+var t = async_test("Shadows of clipped shapes are still drawn within the clipping region");
+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.fillStyle = '#0f0';
+ctx.fillRect(0, 0, 50, 50);
+ctx.fillStyle = '#f00';
+ctx.fillRect(50, 0, 50, 50);
+ctx.save();
+ctx.beginPath();
+ctx.rect(50, 0, 50, 50);
+ctx.clip();
+ctx.shadowColor = '#0f0';
+ctx.shadowOffsetX = 50;
+ctx.fillRect(0, 0, 50, 50);
+ctx.restore();
+_assertPixel(canvas, 25,25, 0,255,0,255);
+_assertPixel(canvas, 75,25, 0,255,0,255);
+t.done();
+
+});
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.clip.1.worker.js b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.clip.1.worker.js
new file mode 100644
index 0000000000..4fafad8330
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.clip.1.worker.js
@@ -0,0 +1,36 @@
+// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
+// OffscreenCanvas test in a worker:2d.shadow.clip.1
+// Description:Shadows of clipped shapes are still drawn within the clipping region
+// Note:
+
+importScripts("/resources/testharness.js");
+importScripts("/html/canvas/resources/canvas-tests.js");
+
+var t = async_test("Shadows of clipped shapes are still drawn within the clipping region");
+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.fillStyle = '#0f0';
+ctx.fillRect(0, 0, 50, 50);
+ctx.fillStyle = '#f00';
+ctx.fillRect(50, 0, 50, 50);
+ctx.save();
+ctx.beginPath();
+ctx.rect(50, 0, 50, 50);
+ctx.clip();
+ctx.shadowColor = '#0f0';
+ctx.shadowOffsetX = 50;
+ctx.fillRect(0, 0, 50, 50);
+ctx.restore();
+_assertPixel(canvas, 25,25, 0,255,0,255);
+_assertPixel(canvas, 75,25, 0,255,0,255);
+t.done();
+
+});
+done();
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.clip.2.html b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.clip.2.html
new file mode 100644
index 0000000000..bc3de09db7
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.clip.2.html
@@ -0,0 +1,40 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>OffscreenCanvas test: 2d.shadow.clip.2</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+
+<h1>2d.shadow.clip.2</h1>
+<p class="desc">Shadows are not drawn outside the clipping region</p>
+
+
+<script>
+var t = async_test("Shadows are not drawn outside the clipping region");
+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.fillStyle = '#f00';
+ctx.fillRect(0, 0, 50, 50);
+ctx.fillStyle = '#0f0';
+ctx.fillRect(50, 0, 50, 50);
+ctx.save();
+ctx.beginPath();
+ctx.rect(0, 0, 50, 50);
+ctx.clip();
+ctx.shadowColor = '#f00';
+ctx.shadowOffsetX = 50;
+ctx.fillRect(0, 0, 50, 50);
+ctx.restore();
+_assertPixel(canvas, 25,25, 0,255,0,255);
+_assertPixel(canvas, 75,25, 0,255,0,255);
+t.done();
+
+});
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.clip.2.worker.js b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.clip.2.worker.js
new file mode 100644
index 0000000000..dd2712af40
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.clip.2.worker.js
@@ -0,0 +1,36 @@
+// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
+// OffscreenCanvas test in a worker:2d.shadow.clip.2
+// Description:Shadows are not drawn outside the clipping region
+// Note:
+
+importScripts("/resources/testharness.js");
+importScripts("/html/canvas/resources/canvas-tests.js");
+
+var t = async_test("Shadows are not drawn outside the clipping region");
+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.fillStyle = '#f00';
+ctx.fillRect(0, 0, 50, 50);
+ctx.fillStyle = '#0f0';
+ctx.fillRect(50, 0, 50, 50);
+ctx.save();
+ctx.beginPath();
+ctx.rect(0, 0, 50, 50);
+ctx.clip();
+ctx.shadowColor = '#f00';
+ctx.shadowOffsetX = 50;
+ctx.fillRect(0, 0, 50, 50);
+ctx.restore();
+_assertPixel(canvas, 25,25, 0,255,0,255);
+_assertPixel(canvas, 75,25, 0,255,0,255);
+t.done();
+
+});
+done();
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.clip.3.html b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.clip.3.html
new file mode 100644
index 0000000000..9656feb41f
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.clip.3.html
@@ -0,0 +1,41 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>OffscreenCanvas test: 2d.shadow.clip.3</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+
+<h1>2d.shadow.clip.3</h1>
+<p class="desc">Shadows of clipped shapes are still drawn within the clipping region</p>
+
+
+<script>
+var t = async_test("Shadows of clipped shapes are still drawn within the clipping region");
+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.fillStyle = '#f00';
+ctx.fillRect(0, 0, 50, 50);
+ctx.fillStyle = '#0f0';
+ctx.fillRect(50, 0, 50, 50);
+ctx.save();
+ctx.beginPath();
+ctx.rect(0, 0, 50, 50);
+ctx.clip();
+ctx.fillStyle = '#f00';
+ctx.shadowColor = '#0f0';
+ctx.shadowOffsetX = 50;
+ctx.fillRect(-50, 0, 50, 50);
+ctx.restore();
+_assertPixel(canvas, 25,25, 0,255,0,255);
+_assertPixel(canvas, 75,25, 0,255,0,255);
+t.done();
+
+});
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.clip.3.worker.js b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.clip.3.worker.js
new file mode 100644
index 0000000000..ed4983ac8c
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.clip.3.worker.js
@@ -0,0 +1,37 @@
+// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
+// OffscreenCanvas test in a worker:2d.shadow.clip.3
+// Description:Shadows of clipped shapes are still drawn within the clipping region
+// Note:
+
+importScripts("/resources/testharness.js");
+importScripts("/html/canvas/resources/canvas-tests.js");
+
+var t = async_test("Shadows of clipped shapes are still drawn within the clipping region");
+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.fillStyle = '#f00';
+ctx.fillRect(0, 0, 50, 50);
+ctx.fillStyle = '#0f0';
+ctx.fillRect(50, 0, 50, 50);
+ctx.save();
+ctx.beginPath();
+ctx.rect(0, 0, 50, 50);
+ctx.clip();
+ctx.fillStyle = '#f00';
+ctx.shadowColor = '#0f0';
+ctx.shadowOffsetX = 50;
+ctx.fillRect(-50, 0, 50, 50);
+ctx.restore();
+_assertPixel(canvas, 25,25, 0,255,0,255);
+_assertPixel(canvas, 75,25, 0,255,0,255);
+t.done();
+
+});
+done();
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.composite.1.html b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.composite.1.html
new file mode 100644
index 0000000000..13e0daf3aa
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.composite.1.html
@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>OffscreenCanvas test: 2d.shadow.composite.1</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+
+<h1>2d.shadow.composite.1</h1>
+<p class="desc">Shadows are drawn using globalCompositeOperation</p>
+
+
+<script>
+var t = async_test("Shadows are drawn using globalCompositeOperation");
+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.fillStyle = '#f00';
+ctx.fillRect(0, 0, 100, 50);
+ctx.globalCompositeOperation = 'xor';
+ctx.shadowColor = '#f00';
+ctx.shadowOffsetX = 100;
+ctx.fillStyle = '#0f0';
+ctx.fillRect(-100, 0, 200, 50);
+_assertPixelApprox(canvas, 50,25, 0,255,0,255, 2);
+t.done();
+
+});
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.composite.1.worker.js b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.composite.1.worker.js
new file mode 100644
index 0000000000..04d4801db9
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.composite.1.worker.js
@@ -0,0 +1,30 @@
+// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
+// OffscreenCanvas test in a worker:2d.shadow.composite.1
+// Description:Shadows are drawn using globalCompositeOperation
+// Note:
+
+importScripts("/resources/testharness.js");
+importScripts("/html/canvas/resources/canvas-tests.js");
+
+var t = async_test("Shadows are drawn using globalCompositeOperation");
+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.fillStyle = '#f00';
+ctx.fillRect(0, 0, 100, 50);
+ctx.globalCompositeOperation = 'xor';
+ctx.shadowColor = '#f00';
+ctx.shadowOffsetX = 100;
+ctx.fillStyle = '#0f0';
+ctx.fillRect(-100, 0, 200, 50);
+_assertPixelApprox(canvas, 50,25, 0,255,0,255, 2);
+t.done();
+
+});
+done();
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.composite.2.html b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.composite.2.html
new file mode 100644
index 0000000000..aea36997b6
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.composite.2.html
@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>OffscreenCanvas test: 2d.shadow.composite.2</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+
+<h1>2d.shadow.composite.2</h1>
+<p class="desc">Shadows are drawn using globalCompositeOperation</p>
+
+
+<script>
+var t = async_test("Shadows are drawn using globalCompositeOperation");
+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.fillStyle = '#f00';
+ctx.fillRect(0, 0, 100, 50);
+ctx.globalCompositeOperation = 'xor';
+ctx.shadowColor = '#f00';
+ctx.shadowBlur = 1;
+ctx.fillStyle = '#0f0';
+ctx.fillRect(-10, -10, 120, 70);
+_assertPixelApprox(canvas, 50,25, 0,255,0,255, 2);
+t.done();
+
+});
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.composite.2.worker.js b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.composite.2.worker.js
new file mode 100644
index 0000000000..505e3d535f
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.composite.2.worker.js
@@ -0,0 +1,30 @@
+// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
+// OffscreenCanvas test in a worker:2d.shadow.composite.2
+// Description:Shadows are drawn using globalCompositeOperation
+// Note:
+
+importScripts("/resources/testharness.js");
+importScripts("/html/canvas/resources/canvas-tests.js");
+
+var t = async_test("Shadows are drawn using globalCompositeOperation");
+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.fillStyle = '#f00';
+ctx.fillRect(0, 0, 100, 50);
+ctx.globalCompositeOperation = 'xor';
+ctx.shadowColor = '#f00';
+ctx.shadowBlur = 1;
+ctx.fillStyle = '#0f0';
+ctx.fillRect(-10, -10, 120, 70);
+_assertPixelApprox(canvas, 50,25, 0,255,0,255, 2);
+t.done();
+
+});
+done();
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.composite.3.html b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.composite.3.html
new file mode 100644
index 0000000000..2218602f38
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.composite.3.html
@@ -0,0 +1,35 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>OffscreenCanvas test: 2d.shadow.composite.3</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+
+<h1>2d.shadow.composite.3</h1>
+<p class="desc">Areas outside shadows are drawn correctly with destination-out</p>
+
+
+<script>
+var t = async_test("Areas outside shadows are drawn correctly with destination-out");
+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.fillStyle = '#0f0';
+ctx.fillRect(0, 0, 100, 50);
+ctx.globalCompositeOperation = 'destination-out';
+ctx.shadowColor = '#f00';
+ctx.shadowBlur = 10;
+ctx.fillStyle = '#f00';
+ctx.fillRect(200, 0, 100, 50);
+_assertPixelApprox(canvas, 5,5, 0,255,0,255, 2);
+_assertPixelApprox(canvas, 50,25, 0,255,0,255, 2);
+t.done();
+
+});
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.composite.3.worker.js b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.composite.3.worker.js
new file mode 100644
index 0000000000..fd58d06192
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.composite.3.worker.js
@@ -0,0 +1,31 @@
+// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
+// OffscreenCanvas test in a worker:2d.shadow.composite.3
+// Description:Areas outside shadows are drawn correctly with destination-out
+// Note:
+
+importScripts("/resources/testharness.js");
+importScripts("/html/canvas/resources/canvas-tests.js");
+
+var t = async_test("Areas outside shadows are drawn correctly with destination-out");
+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.fillStyle = '#0f0';
+ctx.fillRect(0, 0, 100, 50);
+ctx.globalCompositeOperation = 'destination-out';
+ctx.shadowColor = '#f00';
+ctx.shadowBlur = 10;
+ctx.fillStyle = '#f00';
+ctx.fillRect(200, 0, 100, 50);
+_assertPixelApprox(canvas, 5,5, 0,255,0,255, 2);
+_assertPixelApprox(canvas, 50,25, 0,255,0,255, 2);
+t.done();
+
+});
+done();
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.enable.blur.html b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.enable.blur.html
new file mode 100644
index 0000000000..edc4c527b2
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.enable.blur.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.shadow.enable.blur</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+
+<h1>2d.shadow.enable.blur</h1>
+<p class="desc">Shadows are drawn if shadowBlur is set</p>
+
+
+<script>
+var t = async_test("Shadows are drawn if shadowBlur is set");
+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.globalCompositeOperation = 'destination-atop';
+ctx.shadowColor = '#0f0';
+ctx.shadowBlur = 0.1;
+ctx.fillStyle = '#f00';
+ctx.fillRect(0, 0, 100, 50);
+_assertPixel(canvas, 50,25, 0,255,0,255);
+t.done();
+
+});
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.enable.blur.worker.js b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.enable.blur.worker.js
new file mode 100644
index 0000000000..85bf21a086
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.enable.blur.worker.js
@@ -0,0 +1,28 @@
+// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
+// OffscreenCanvas test in a worker:2d.shadow.enable.blur
+// Description:Shadows are drawn if shadowBlur is set
+// Note:
+
+importScripts("/resources/testharness.js");
+importScripts("/html/canvas/resources/canvas-tests.js");
+
+var t = async_test("Shadows are drawn if shadowBlur is set");
+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.globalCompositeOperation = 'destination-atop';
+ctx.shadowColor = '#0f0';
+ctx.shadowBlur = 0.1;
+ctx.fillStyle = '#f00';
+ctx.fillRect(0, 0, 100, 50);
+_assertPixel(canvas, 50,25, 0,255,0,255);
+t.done();
+
+});
+done();
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.enable.off.1.html b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.enable.off.1.html
new file mode 100644
index 0000000000..f0c9282090
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.enable.off.1.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>OffscreenCanvas test: 2d.shadow.enable.off.1</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+
+<h1>2d.shadow.enable.off.1</h1>
+<p class="desc">Shadows are not drawn when only shadowColor is set</p>
+
+
+<script>
+var t = async_test("Shadows are not drawn when only shadowColor is set");
+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.shadowColor = '#f00';
+ctx.fillStyle = '#0f0';
+ctx.fillRect(0, 0, 100, 50);
+_assertPixel(canvas, 50,25, 0,255,0,255);
+t.done();
+
+});
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.enable.off.1.worker.js b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.enable.off.1.worker.js
new file mode 100644
index 0000000000..dae0ea648d
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.enable.off.1.worker.js
@@ -0,0 +1,26 @@
+// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
+// OffscreenCanvas test in a worker:2d.shadow.enable.off.1
+// Description:Shadows are not drawn when only shadowColor is set
+// Note:
+
+importScripts("/resources/testharness.js");
+importScripts("/html/canvas/resources/canvas-tests.js");
+
+var t = async_test("Shadows are not drawn when only shadowColor is set");
+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.shadowColor = '#f00';
+ctx.fillStyle = '#0f0';
+ctx.fillRect(0, 0, 100, 50);
+_assertPixel(canvas, 50,25, 0,255,0,255);
+t.done();
+
+});
+done();
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.enable.off.2.html b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.enable.off.2.html
new file mode 100644
index 0000000000..3c27b988c9
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.enable.off.2.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>OffscreenCanvas test: 2d.shadow.enable.off.2</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+
+<h1>2d.shadow.enable.off.2</h1>
+<p class="desc">Shadows are not drawn when only shadowColor is set</p>
+
+
+<script>
+var t = async_test("Shadows are not drawn when only shadowColor is set");
+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.globalCompositeOperation = 'destination-atop';
+ctx.shadowColor = '#f00';
+ctx.fillStyle = '#0f0';
+ctx.fillRect(0, 0, 100, 50);
+_assertPixel(canvas, 50,25, 0,255,0,255);
+t.done();
+
+});
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.enable.off.2.worker.js b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.enable.off.2.worker.js
new file mode 100644
index 0000000000..2f1573ef3f
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.enable.off.2.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.shadow.enable.off.2
+// Description:Shadows are not drawn when only shadowColor is set
+// Note:
+
+importScripts("/resources/testharness.js");
+importScripts("/html/canvas/resources/canvas-tests.js");
+
+var t = async_test("Shadows are not drawn when only shadowColor is set");
+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.globalCompositeOperation = 'destination-atop';
+ctx.shadowColor = '#f00';
+ctx.fillStyle = '#0f0';
+ctx.fillRect(0, 0, 100, 50);
+_assertPixel(canvas, 50,25, 0,255,0,255);
+t.done();
+
+});
+done();
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.enable.x.html b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.enable.x.html
new file mode 100644
index 0000000000..9107ef25de
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.enable.x.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.shadow.enable.x</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+
+<h1>2d.shadow.enable.x</h1>
+<p class="desc">Shadows are drawn if shadowOffsetX is set</p>
+
+
+<script>
+var t = async_test("Shadows are drawn if shadowOffsetX is set");
+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.globalCompositeOperation = 'destination-atop';
+ctx.shadowColor = '#0f0';
+ctx.shadowOffsetX = 0.1;
+ctx.fillStyle = '#f00';
+ctx.fillRect(0, 0, 100, 50);
+_assertPixel(canvas, 50,25, 0,255,0,255);
+t.done();
+
+});
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.enable.x.worker.js b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.enable.x.worker.js
new file mode 100644
index 0000000000..d8e7d5039b
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.enable.x.worker.js
@@ -0,0 +1,28 @@
+// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
+// OffscreenCanvas test in a worker:2d.shadow.enable.x
+// Description:Shadows are drawn if shadowOffsetX is set
+// Note:
+
+importScripts("/resources/testharness.js");
+importScripts("/html/canvas/resources/canvas-tests.js");
+
+var t = async_test("Shadows are drawn if shadowOffsetX is set");
+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.globalCompositeOperation = 'destination-atop';
+ctx.shadowColor = '#0f0';
+ctx.shadowOffsetX = 0.1;
+ctx.fillStyle = '#f00';
+ctx.fillRect(0, 0, 100, 50);
+_assertPixel(canvas, 50,25, 0,255,0,255);
+t.done();
+
+});
+done();
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.enable.y.html b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.enable.y.html
new file mode 100644
index 0000000000..77a79d8457
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.enable.y.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.shadow.enable.y</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+
+<h1>2d.shadow.enable.y</h1>
+<p class="desc">Shadows are drawn if shadowOffsetY is set</p>
+
+
+<script>
+var t = async_test("Shadows are drawn if shadowOffsetY is set");
+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.globalCompositeOperation = 'destination-atop';
+ctx.shadowColor = '#0f0';
+ctx.shadowOffsetY = 0.1;
+ctx.fillStyle = '#f00';
+ctx.fillRect(0, 0, 100, 50);
+_assertPixel(canvas, 50,25, 0,255,0,255);
+t.done();
+
+});
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.enable.y.worker.js b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.enable.y.worker.js
new file mode 100644
index 0000000000..53140b13a9
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.enable.y.worker.js
@@ -0,0 +1,28 @@
+// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
+// OffscreenCanvas test in a worker:2d.shadow.enable.y
+// Description:Shadows are drawn if shadowOffsetY is set
+// Note:
+
+importScripts("/resources/testharness.js");
+importScripts("/html/canvas/resources/canvas-tests.js");
+
+var t = async_test("Shadows are drawn if shadowOffsetY is set");
+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.globalCompositeOperation = 'destination-atop';
+ctx.shadowColor = '#0f0';
+ctx.shadowOffsetY = 0.1;
+ctx.fillStyle = '#f00';
+ctx.fillRect(0, 0, 100, 50);
+_assertPixel(canvas, 50,25, 0,255,0,255);
+t.done();
+
+});
+done();
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.gradient.alpha.html b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.gradient.alpha.html
new file mode 100644
index 0000000000..d92a248440
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.gradient.alpha.html
@@ -0,0 +1,36 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>OffscreenCanvas test: 2d.shadow.gradient.alpha</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+
+<h1>2d.shadow.gradient.alpha</h1>
+<p class="desc">Shadows are drawn correctly for partially-transparent gradient fills</p>
+
+
+<script>
+var t = async_test("Shadows are drawn correctly for partially-transparent gradient fills");
+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');
+
+var gradient = ctx.createLinearGradient(0, 0, 100, 0);
+gradient.addColorStop(0, 'rgba(255,0,0,0.5)');
+gradient.addColorStop(1, 'rgba(255,0,0,0.5)');
+ctx.fillStyle = '#f00';
+ctx.fillRect(0, 0, 100, 50);
+ctx.shadowOffsetY = 50;
+ctx.shadowColor = '#00f';
+ctx.fillStyle = gradient;
+ctx.fillRect(0, -50, 100, 50);
+_assertPixelApprox(canvas, 50,25, 127,0,127,255, 2);
+t.done();
+
+});
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.gradient.alpha.worker.js b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.gradient.alpha.worker.js
new file mode 100644
index 0000000000..b5b65a0056
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.gradient.alpha.worker.js
@@ -0,0 +1,32 @@
+// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
+// OffscreenCanvas test in a worker:2d.shadow.gradient.alpha
+// Description:Shadows are drawn correctly for partially-transparent gradient fills
+// Note:
+
+importScripts("/resources/testharness.js");
+importScripts("/html/canvas/resources/canvas-tests.js");
+
+var t = async_test("Shadows are drawn correctly for partially-transparent gradient fills");
+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');
+
+var gradient = ctx.createLinearGradient(0, 0, 100, 0);
+gradient.addColorStop(0, 'rgba(255,0,0,0.5)');
+gradient.addColorStop(1, 'rgba(255,0,0,0.5)');
+ctx.fillStyle = '#f00';
+ctx.fillRect(0, 0, 100, 50);
+ctx.shadowOffsetY = 50;
+ctx.shadowColor = '#00f';
+ctx.fillStyle = gradient;
+ctx.fillRect(0, -50, 100, 50);
+_assertPixelApprox(canvas, 50,25, 127,0,127,255, 2);
+t.done();
+
+});
+done();
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.gradient.basic.html b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.gradient.basic.html
new file mode 100644
index 0000000000..b88281be9a
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.gradient.basic.html
@@ -0,0 +1,36 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>OffscreenCanvas test: 2d.shadow.gradient.basic</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+
+<h1>2d.shadow.gradient.basic</h1>
+<p class="desc">Shadows are drawn for gradient fills</p>
+
+
+<script>
+var t = async_test("Shadows are drawn for gradient fills");
+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');
+
+var gradient = ctx.createLinearGradient(0, 0, 100, 0);
+gradient.addColorStop(0, '#f00');
+gradient.addColorStop(1, '#f00');
+ctx.fillStyle = '#f00';
+ctx.fillRect(0, 0, 100, 50);
+ctx.shadowColor = '#0f0';
+ctx.shadowOffsetY = 50;
+ctx.fillStyle = gradient;
+ctx.fillRect(0, -50, 100, 50);
+_assertPixel(canvas, 50,25, 0,255,0,255);
+t.done();
+
+});
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.gradient.basic.worker.js b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.gradient.basic.worker.js
new file mode 100644
index 0000000000..ef9ce712f2
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.gradient.basic.worker.js
@@ -0,0 +1,32 @@
+// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
+// OffscreenCanvas test in a worker:2d.shadow.gradient.basic
+// Description:Shadows are drawn for gradient fills
+// Note:
+
+importScripts("/resources/testharness.js");
+importScripts("/html/canvas/resources/canvas-tests.js");
+
+var t = async_test("Shadows are drawn for gradient fills");
+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');
+
+var gradient = ctx.createLinearGradient(0, 0, 100, 0);
+gradient.addColorStop(0, '#f00');
+gradient.addColorStop(1, '#f00');
+ctx.fillStyle = '#f00';
+ctx.fillRect(0, 0, 100, 50);
+ctx.shadowColor = '#0f0';
+ctx.shadowOffsetY = 50;
+ctx.fillStyle = gradient;
+ctx.fillRect(0, -50, 100, 50);
+_assertPixel(canvas, 50,25, 0,255,0,255);
+t.done();
+
+});
+done();
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.gradient.transparent.1.html b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.gradient.transparent.1.html
new file mode 100644
index 0000000000..f71a8b4222
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.gradient.transparent.1.html
@@ -0,0 +1,36 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>OffscreenCanvas test: 2d.shadow.gradient.transparent.1</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+
+<h1>2d.shadow.gradient.transparent.1</h1>
+<p class="desc">Shadows are not drawn for transparent gradient fills</p>
+
+
+<script>
+var t = async_test("Shadows are not drawn for transparent gradient fills");
+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');
+
+var gradient = ctx.createLinearGradient(0, 0, 100, 0);
+gradient.addColorStop(0, 'rgba(0,0,0,0)');
+gradient.addColorStop(1, 'rgba(0,0,0,0)');
+ctx.fillStyle = '#0f0';
+ctx.fillRect(0, 0, 100, 50);
+ctx.shadowColor = '#f00';
+ctx.shadowOffsetY = 50;
+ctx.fillStyle = gradient;
+ctx.fillRect(0, -50, 100, 50);
+_assertPixel(canvas, 50,25, 0,255,0,255);
+t.done();
+
+});
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.gradient.transparent.1.worker.js b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.gradient.transparent.1.worker.js
new file mode 100644
index 0000000000..b60d6f7f59
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.gradient.transparent.1.worker.js
@@ -0,0 +1,32 @@
+// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
+// OffscreenCanvas test in a worker:2d.shadow.gradient.transparent.1
+// Description:Shadows are not drawn for transparent gradient fills
+// Note:
+
+importScripts("/resources/testharness.js");
+importScripts("/html/canvas/resources/canvas-tests.js");
+
+var t = async_test("Shadows are not drawn for transparent gradient fills");
+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');
+
+var gradient = ctx.createLinearGradient(0, 0, 100, 0);
+gradient.addColorStop(0, 'rgba(0,0,0,0)');
+gradient.addColorStop(1, 'rgba(0,0,0,0)');
+ctx.fillStyle = '#0f0';
+ctx.fillRect(0, 0, 100, 50);
+ctx.shadowColor = '#f00';
+ctx.shadowOffsetY = 50;
+ctx.fillStyle = gradient;
+ctx.fillRect(0, -50, 100, 50);
+_assertPixel(canvas, 50,25, 0,255,0,255);
+t.done();
+
+});
+done();
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.gradient.transparent.2.html b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.gradient.transparent.2.html
new file mode 100644
index 0000000000..d7c560ec46
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.gradient.transparent.2.html
@@ -0,0 +1,42 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>OffscreenCanvas test: 2d.shadow.gradient.transparent.2</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+
+<h1>2d.shadow.gradient.transparent.2</h1>
+<p class="desc">Shadows are not drawn for transparent parts of gradient fills</p>
+
+
+<script>
+var t = async_test("Shadows are not drawn for transparent parts of gradient fills");
+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');
+
+var gradient = ctx.createLinearGradient(0, 0, 100, 0);
+gradient.addColorStop(0, '#f00');
+gradient.addColorStop(0.499, '#f00');
+gradient.addColorStop(0.5, 'rgba(0,0,0,0)');
+gradient.addColorStop(1, 'rgba(0,0,0,0)');
+ctx.fillStyle = '#f00';
+ctx.fillRect(0, 0, 50, 50);
+ctx.fillStyle = '#0f0';
+ctx.fillRect(50, 0, 50, 50);
+ctx.shadowOffsetY = 50;
+ctx.shadowColor = '#0f0';
+ctx.fillStyle = gradient;
+ctx.fillRect(0, -50, 100, 50);
+_assertPixel(canvas, 25,25, 0,255,0,255);
+_assertPixel(canvas, 50,25, 0,255,0,255);
+_assertPixel(canvas, 75,25, 0,255,0,255);
+t.done();
+
+});
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.gradient.transparent.2.worker.js b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.gradient.transparent.2.worker.js
new file mode 100644
index 0000000000..7226b004b8
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.gradient.transparent.2.worker.js
@@ -0,0 +1,38 @@
+// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
+// OffscreenCanvas test in a worker:2d.shadow.gradient.transparent.2
+// Description:Shadows are not drawn for transparent parts of gradient fills
+// Note:
+
+importScripts("/resources/testharness.js");
+importScripts("/html/canvas/resources/canvas-tests.js");
+
+var t = async_test("Shadows are not drawn for transparent parts of gradient fills");
+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');
+
+var gradient = ctx.createLinearGradient(0, 0, 100, 0);
+gradient.addColorStop(0, '#f00');
+gradient.addColorStop(0.499, '#f00');
+gradient.addColorStop(0.5, 'rgba(0,0,0,0)');
+gradient.addColorStop(1, 'rgba(0,0,0,0)');
+ctx.fillStyle = '#f00';
+ctx.fillRect(0, 0, 50, 50);
+ctx.fillStyle = '#0f0';
+ctx.fillRect(50, 0, 50, 50);
+ctx.shadowOffsetY = 50;
+ctx.shadowColor = '#0f0';
+ctx.fillStyle = gradient;
+ctx.fillRect(0, -50, 100, 50);
+_assertPixel(canvas, 25,25, 0,255,0,255);
+_assertPixel(canvas, 50,25, 0,255,0,255);
+_assertPixel(canvas, 75,25, 0,255,0,255);
+t.done();
+
+});
+done();
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.image.alpha.html b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.image.alpha.html
new file mode 100644
index 0000000000..5add7eae5a
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.image.alpha.html
@@ -0,0 +1,44 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>OffscreenCanvas test: 2d.shadow.image.alpha</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+
+<h1>2d.shadow.image.alpha</h1>
+<p class="desc">Shadows are drawn correctly for partially-transparent images</p>
+
+
+<script>
+var t = async_test("Shadows are drawn correctly for partially-transparent images");
+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.fillStyle = '#f00';
+ctx.fillRect(0, 0, 100, 50);
+ctx.shadowOffsetY = 50;
+ctx.shadowColor = '#00f';
+var promise = new Promise(function(resolve, reject) {
+    var xhr = new XMLHttpRequest();
+    xhr.open("GET", '/images/transparent50.png');
+    xhr.responseType = 'blob';
+    xhr.send();
+    xhr.onload = function() {
+        resolve(xhr.response);
+    };
+});
+promise.then(function(response) {
+    createImageBitmap(response).then(bitmap => {
+        ctx.drawImage(bitmap, 0, -50);
+        _assertPixelApprox(canvas, 50,25, 127,0,127,255, 2);
+    }, t_fail);
+}).then(t_pass, t_fail);
+
+});
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.image.alpha.worker.js b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.image.alpha.worker.js
new file mode 100644
index 0000000000..7a1d99218f
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.image.alpha.worker.js
@@ -0,0 +1,40 @@
+// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
+// OffscreenCanvas test in a worker:2d.shadow.image.alpha
+// Description:Shadows are drawn correctly for partially-transparent images
+// Note:
+
+importScripts("/resources/testharness.js");
+importScripts("/html/canvas/resources/canvas-tests.js");
+
+var t = async_test("Shadows are drawn correctly for partially-transparent images");
+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.fillStyle = '#f00';
+ctx.fillRect(0, 0, 100, 50);
+ctx.shadowOffsetY = 50;
+ctx.shadowColor = '#00f';
+var promise = new Promise(function(resolve, reject) {
+    var xhr = new XMLHttpRequest();
+    xhr.open("GET", '/images/transparent50.png');
+    xhr.responseType = 'blob';
+    xhr.send();
+    xhr.onload = function() {
+        resolve(xhr.response);
+    };
+});
+promise.then(function(response) {
+    createImageBitmap(response).then(bitmap => {
+        ctx.drawImage(bitmap, 0, -50);
+        _assertPixelApprox(canvas, 50,25, 127,0,127,255, 2);
+    }, t_fail);
+}).then(t_pass, t_fail);
+
+});
+done();
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.image.basic.html b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.image.basic.html
new file mode 100644
index 0000000000..101cfbab0c
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.image.basic.html
@@ -0,0 +1,44 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>OffscreenCanvas test: 2d.shadow.image.basic</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+
+<h1>2d.shadow.image.basic</h1>
+<p class="desc">Shadows are drawn for images</p>
+
+
+<script>
+var t = async_test("Shadows are drawn for images");
+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.fillStyle = '#f00';
+ctx.fillRect(0, 0, 100, 50);
+ctx.shadowColor = '#0f0';
+ctx.shadowOffsetY = 50;
+var promise = new Promise(function(resolve, reject) {
+    var xhr = new XMLHttpRequest();
+    xhr.open("GET", '/images/red.png');
+    xhr.responseType = 'blob';
+    xhr.send();
+    xhr.onload = function() {
+        resolve(xhr.response);
+    };
+});
+promise.then(function(response) {
+    createImageBitmap(response).then(bitmap => {
+        ctx.drawImage(bitmap, 0, -50);
+        _assertPixel(canvas, 50,25, 0,255,0,255);
+    }, t_fail);
+}).then(t_pass, t_fail);
+
+});
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.image.basic.worker.js b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.image.basic.worker.js
new file mode 100644
index 0000000000..f1d72def72
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.image.basic.worker.js
@@ -0,0 +1,40 @@
+// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
+// OffscreenCanvas test in a worker:2d.shadow.image.basic
+// Description:Shadows are drawn for images
+// Note:
+
+importScripts("/resources/testharness.js");
+importScripts("/html/canvas/resources/canvas-tests.js");
+
+var t = async_test("Shadows are drawn for images");
+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.fillStyle = '#f00';
+ctx.fillRect(0, 0, 100, 50);
+ctx.shadowColor = '#0f0';
+ctx.shadowOffsetY = 50;
+var promise = new Promise(function(resolve, reject) {
+    var xhr = new XMLHttpRequest();
+    xhr.open("GET", '/images/red.png');
+    xhr.responseType = 'blob';
+    xhr.send();
+    xhr.onload = function() {
+        resolve(xhr.response);
+    };
+});
+promise.then(function(response) {
+    createImageBitmap(response).then(bitmap => {
+        ctx.drawImage(bitmap, 0, -50);
+        _assertPixel(canvas, 50,25, 0,255,0,255);
+    }, t_fail);
+}).then(t_pass, t_fail);
+
+});
+done();
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.image.scale.html b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.image.scale.html
new file mode 100644
index 0000000000..c56a73f736
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.image.scale.html
@@ -0,0 +1,46 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>OffscreenCanvas test: 2d.shadow.image.scale</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+
+<h1>2d.shadow.image.scale</h1>
+<p class="desc">Shadows are drawn correctly for scaled images</p>
+
+
+<script>
+var t = async_test("Shadows are drawn correctly for scaled images");
+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.fillStyle = '#f00';
+ctx.fillRect(0, 0, 100, 50);
+ctx.shadowOffsetY = 50;
+ctx.shadowColor = '#0f0';
+var promise = new Promise(function(resolve, reject) {
+    var xhr = new XMLHttpRequest();
+    xhr.open("GET", '/images/redtransparent.png');
+    xhr.responseType = 'blob';
+    xhr.send();
+    xhr.onload = function() {
+        resolve(xhr.response);
+    };
+});
+promise.then(function(response) {
+    createImageBitmap(response).then(bitmap => {
+        ctx.drawImage(bitmap, 0, 0, 100, 50, -10, -50, 240, 50);
+        _assertPixelApprox(canvas, 25,25, 0,255,0,255, 2);
+        _assertPixelApprox(canvas, 50,25, 0,255,0,255, 2);
+        _assertPixelApprox(canvas, 75,25, 0,255,0,255, 2);
+    }, t_fail);
+}).then(t_pass, t_fail);
+
+});
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.image.scale.worker.js b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.image.scale.worker.js
new file mode 100644
index 0000000000..a8c0ead903
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.image.scale.worker.js
@@ -0,0 +1,42 @@
+// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
+// OffscreenCanvas test in a worker:2d.shadow.image.scale
+// Description:Shadows are drawn correctly for scaled images
+// Note:
+
+importScripts("/resources/testharness.js");
+importScripts("/html/canvas/resources/canvas-tests.js");
+
+var t = async_test("Shadows are drawn correctly for scaled images");
+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.fillStyle = '#f00';
+ctx.fillRect(0, 0, 100, 50);
+ctx.shadowOffsetY = 50;
+ctx.shadowColor = '#0f0';
+var promise = new Promise(function(resolve, reject) {
+    var xhr = new XMLHttpRequest();
+    xhr.open("GET", '/images/redtransparent.png');
+    xhr.responseType = 'blob';
+    xhr.send();
+    xhr.onload = function() {
+        resolve(xhr.response);
+    };
+});
+promise.then(function(response) {
+    createImageBitmap(response).then(bitmap => {
+        ctx.drawImage(bitmap, 0, 0, 100, 50, -10, -50, 240, 50);
+        _assertPixelApprox(canvas, 25,25, 0,255,0,255, 2);
+        _assertPixelApprox(canvas, 50,25, 0,255,0,255, 2);
+        _assertPixelApprox(canvas, 75,25, 0,255,0,255, 2);
+    }, t_fail);
+}).then(t_pass, t_fail);
+
+});
+done();
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.image.section.html b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.image.section.html
new file mode 100644
index 0000000000..cd09503499
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.image.section.html
@@ -0,0 +1,46 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>OffscreenCanvas test: 2d.shadow.image.section</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+
+<h1>2d.shadow.image.section</h1>
+<p class="desc">Shadows are not drawn for areas outside image source rectangles</p>
+
+
+<script>
+var t = async_test("Shadows are not drawn for areas outside image source rectangles");
+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.fillStyle = '#0f0';
+ctx.fillRect(0, 0, 100, 50);
+ctx.shadowOffsetY = 50;
+ctx.shadowColor = '#f00';
+var promise = new Promise(function(resolve, reject) {
+    var xhr = new XMLHttpRequest();
+    xhr.open("GET", '/images/redtransparent.png');
+    xhr.responseType = 'blob';
+    xhr.send();
+    xhr.onload = function() {
+        resolve(xhr.response);
+    };
+});
+promise.then(function(response) {
+    createImageBitmap(response).then(bitmap => {
+        ctx.drawImage(bitmap, 50, 0, 50, 50, 0, -50, 50, 50);
+        _assertPixelApprox(canvas, 25,25, 0,255,0,255, 2);
+        _assertPixelApprox(canvas, 50,25, 0,255,0,255, 2);
+        _assertPixelApprox(canvas, 75,25, 0,255,0,255, 2);
+    }, t_fail);
+}).then(t_pass, t_fail);
+
+});
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.image.section.worker.js b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.image.section.worker.js
new file mode 100644
index 0000000000..60e32b4883
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.image.section.worker.js
@@ -0,0 +1,42 @@
+// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
+// OffscreenCanvas test in a worker:2d.shadow.image.section
+// Description:Shadows are not drawn for areas outside image source rectangles
+// Note:
+
+importScripts("/resources/testharness.js");
+importScripts("/html/canvas/resources/canvas-tests.js");
+
+var t = async_test("Shadows are not drawn for areas outside image source rectangles");
+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.fillStyle = '#0f0';
+ctx.fillRect(0, 0, 100, 50);
+ctx.shadowOffsetY = 50;
+ctx.shadowColor = '#f00';
+var promise = new Promise(function(resolve, reject) {
+    var xhr = new XMLHttpRequest();
+    xhr.open("GET", '/images/redtransparent.png');
+    xhr.responseType = 'blob';
+    xhr.send();
+    xhr.onload = function() {
+        resolve(xhr.response);
+    };
+});
+promise.then(function(response) {
+    createImageBitmap(response).then(bitmap => {
+        ctx.drawImage(bitmap, 50, 0, 50, 50, 0, -50, 50, 50);
+        _assertPixelApprox(canvas, 25,25, 0,255,0,255, 2);
+        _assertPixelApprox(canvas, 50,25, 0,255,0,255, 2);
+        _assertPixelApprox(canvas, 75,25, 0,255,0,255, 2);
+    }, t_fail);
+}).then(t_pass, t_fail);
+
+});
+done();
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.image.transparent.1.html b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.image.transparent.1.html
new file mode 100644
index 0000000000..37844050a9
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.image.transparent.1.html
@@ -0,0 +1,44 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>OffscreenCanvas test: 2d.shadow.image.transparent.1</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+
+<h1>2d.shadow.image.transparent.1</h1>
+<p class="desc">Shadows are not drawn for transparent images</p>
+
+
+<script>
+var t = async_test("Shadows are not drawn for transparent images");
+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.fillStyle = '#0f0';
+ctx.fillRect(0, 0, 100, 50);
+ctx.shadowColor = '#f00';
+ctx.shadowOffsetY = 50;
+var promise = new Promise(function(resolve, reject) {
+    var xhr = new XMLHttpRequest();
+    xhr.open("GET", '/images/transparent.png');
+    xhr.responseType = 'blob';
+    xhr.send();
+    xhr.onload = function() {
+        resolve(xhr.response);
+    };
+});
+promise.then(function(response) {
+    createImageBitmap(response).then(bitmap => {
+        ctx.drawImage(bitmap, 0, -50);
+        _assertPixel(canvas, 50,25, 0,255,0,255);
+    }, t_fail);
+}).then(t_pass, t_fail);
+
+});
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.image.transparent.1.worker.js b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.image.transparent.1.worker.js
new file mode 100644
index 0000000000..8e8ded8bd3
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.image.transparent.1.worker.js
@@ -0,0 +1,40 @@
+// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
+// OffscreenCanvas test in a worker:2d.shadow.image.transparent.1
+// Description:Shadows are not drawn for transparent images
+// Note:
+
+importScripts("/resources/testharness.js");
+importScripts("/html/canvas/resources/canvas-tests.js");
+
+var t = async_test("Shadows are not drawn for transparent images");
+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.fillStyle = '#0f0';
+ctx.fillRect(0, 0, 100, 50);
+ctx.shadowColor = '#f00';
+ctx.shadowOffsetY = 50;
+var promise = new Promise(function(resolve, reject) {
+    var xhr = new XMLHttpRequest();
+    xhr.open("GET", '/images/transparent.png');
+    xhr.responseType = 'blob';
+    xhr.send();
+    xhr.onload = function() {
+        resolve(xhr.response);
+    };
+});
+promise.then(function(response) {
+    createImageBitmap(response).then(bitmap => {
+        ctx.drawImage(bitmap, 0, -50);
+        _assertPixel(canvas, 50,25, 0,255,0,255);
+    }, t_fail);
+}).then(t_pass, t_fail);
+
+});
+done();
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.image.transparent.2.html b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.image.transparent.2.html
new file mode 100644
index 0000000000..996bce718a
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.image.transparent.2.html
@@ -0,0 +1,50 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>OffscreenCanvas test: 2d.shadow.image.transparent.2</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+
+<h1>2d.shadow.image.transparent.2</h1>
+<p class="desc">Shadows are not drawn for transparent parts of images</p>
+
+
+<script>
+var t = async_test("Shadows are not drawn for transparent parts of images");
+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.fillStyle = '#0f0';
+ctx.fillRect(0, 0, 50, 50);
+ctx.fillStyle = '#f00';
+ctx.fillRect(50, 0, 50, 50);
+ctx.shadowOffsetY = 50;
+ctx.shadowColor = '#0f0';
+var promise = new Promise(function(resolve, reject) {
+    var xhr = new XMLHttpRequest();
+    xhr.open("GET", '/images/redtransparent.png');
+    xhr.responseType = 'blob';
+    xhr.send();
+    xhr.onload = function() {
+        resolve(xhr.response);
+    };
+});
+promise.then(function(response) {
+    createImageBitmap(response).then(bitmap => {
+        ctx.drawImage(bitmap, 50, -50);
+        ctx.shadowColor = '#f00';
+        ctx.drawImage(bitmap, -50, -50);
+        _assertPixel(canvas, 25,25, 0,255,0,255);
+        _assertPixel(canvas, 50,25, 0,255,0,255);
+        _assertPixel(canvas, 75,25, 0,255,0,255);
+    }, t_fail);
+}).then(t_pass, t_fail);
+
+});
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.image.transparent.2.worker.js b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.image.transparent.2.worker.js
new file mode 100644
index 0000000000..5075d6cfa7
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.image.transparent.2.worker.js
@@ -0,0 +1,46 @@
+// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
+// OffscreenCanvas test in a worker:2d.shadow.image.transparent.2
+// Description:Shadows are not drawn for transparent parts of images
+// Note:
+
+importScripts("/resources/testharness.js");
+importScripts("/html/canvas/resources/canvas-tests.js");
+
+var t = async_test("Shadows are not drawn for transparent parts of images");
+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.fillStyle = '#0f0';
+ctx.fillRect(0, 0, 50, 50);
+ctx.fillStyle = '#f00';
+ctx.fillRect(50, 0, 50, 50);
+ctx.shadowOffsetY = 50;
+ctx.shadowColor = '#0f0';
+var promise = new Promise(function(resolve, reject) {
+    var xhr = new XMLHttpRequest();
+    xhr.open("GET", '/images/redtransparent.png');
+    xhr.responseType = 'blob';
+    xhr.send();
+    xhr.onload = function() {
+        resolve(xhr.response);
+    };
+});
+promise.then(function(response) {
+    createImageBitmap(response).then(bitmap => {
+        ctx.drawImage(bitmap, 50, -50);
+        ctx.shadowColor = '#f00';
+        ctx.drawImage(bitmap, -50, -50);
+        _assertPixel(canvas, 25,25, 0,255,0,255);
+        _assertPixel(canvas, 50,25, 0,255,0,255);
+        _assertPixel(canvas, 75,25, 0,255,0,255);
+    }, t_fail);
+}).then(t_pass, t_fail);
+
+});
+done();
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.offset.negativeX.html b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.offset.negativeX.html
new file mode 100644
index 0000000000..97c04018ac
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.offset.negativeX.html
@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>OffscreenCanvas test: 2d.shadow.offset.negativeX</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+
+<h1>2d.shadow.offset.negativeX</h1>
+<p class="desc">Shadows can be offset with negative x</p>
+
+
+<script>
+var t = async_test("Shadows can be offset with negative x");
+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.fillStyle = '#f00';
+ctx.fillRect(0, 0, 100, 50);
+ctx.fillStyle = '#0f0';
+ctx.shadowColor = '#0f0';
+ctx.shadowOffsetX = -50;
+ctx.fillRect(50, 0, 50, 50);
+_assertPixel(canvas, 25,25, 0,255,0,255);
+_assertPixel(canvas, 75,25, 0,255,0,255);
+t.done();
+
+});
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.offset.negativeX.worker.js b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.offset.negativeX.worker.js
new file mode 100644
index 0000000000..93c226570f
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.offset.negativeX.worker.js
@@ -0,0 +1,30 @@
+// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
+// OffscreenCanvas test in a worker:2d.shadow.offset.negativeX
+// Description:Shadows can be offset with negative x
+// Note:
+
+importScripts("/resources/testharness.js");
+importScripts("/html/canvas/resources/canvas-tests.js");
+
+var t = async_test("Shadows can be offset with negative x");
+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.fillStyle = '#f00';
+ctx.fillRect(0, 0, 100, 50);
+ctx.fillStyle = '#0f0';
+ctx.shadowColor = '#0f0';
+ctx.shadowOffsetX = -50;
+ctx.fillRect(50, 0, 50, 50);
+_assertPixel(canvas, 25,25, 0,255,0,255);
+_assertPixel(canvas, 75,25, 0,255,0,255);
+t.done();
+
+});
+done();
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.offset.negativeY.html b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.offset.negativeY.html
new file mode 100644
index 0000000000..7f5d5ab9a8
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.offset.negativeY.html
@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>OffscreenCanvas test: 2d.shadow.offset.negativeY</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+
+<h1>2d.shadow.offset.negativeY</h1>
+<p class="desc">Shadows can be offset with negative y</p>
+
+
+<script>
+var t = async_test("Shadows can be offset with negative y");
+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.fillStyle = '#f00';
+ctx.fillRect(0, 0, 100, 50);
+ctx.fillStyle = '#0f0';
+ctx.shadowColor = '#0f0';
+ctx.shadowOffsetY = -25;
+ctx.fillRect(0, 25, 100, 25);
+_assertPixel(canvas, 50,12, 0,255,0,255);
+_assertPixel(canvas, 50,37, 0,255,0,255);
+t.done();
+
+});
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.offset.negativeY.worker.js b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.offset.negativeY.worker.js
new file mode 100644
index 0000000000..6ee0bcc7c5
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.offset.negativeY.worker.js
@@ -0,0 +1,30 @@
+// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
+// OffscreenCanvas test in a worker:2d.shadow.offset.negativeY
+// Description:Shadows can be offset with negative y
+// Note:
+
+importScripts("/resources/testharness.js");
+importScripts("/html/canvas/resources/canvas-tests.js");
+
+var t = async_test("Shadows can be offset with negative y");
+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.fillStyle = '#f00';
+ctx.fillRect(0, 0, 100, 50);
+ctx.fillStyle = '#0f0';
+ctx.shadowColor = '#0f0';
+ctx.shadowOffsetY = -25;
+ctx.fillRect(0, 25, 100, 25);
+_assertPixel(canvas, 50,12, 0,255,0,255);
+_assertPixel(canvas, 50,37, 0,255,0,255);
+t.done();
+
+});
+done();
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.offset.positiveX.html b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.offset.positiveX.html
new file mode 100644
index 0000000000..a745de88ab
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.offset.positiveX.html
@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>OffscreenCanvas test: 2d.shadow.offset.positiveX</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+
+<h1>2d.shadow.offset.positiveX</h1>
+<p class="desc">Shadows can be offset with positive x</p>
+
+
+<script>
+var t = async_test("Shadows can be offset with positive x");
+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.fillStyle = '#f00';
+ctx.fillRect(0, 0, 100, 50);
+ctx.fillStyle = '#0f0';
+ctx.shadowColor = '#0f0';
+ctx.shadowOffsetX = 50;
+ctx.fillRect(0, 0, 50, 50);
+_assertPixel(canvas, 25,25, 0,255,0,255);
+_assertPixel(canvas, 75,25, 0,255,0,255);
+t.done();
+
+});
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.offset.positiveX.worker.js b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.offset.positiveX.worker.js
new file mode 100644
index 0000000000..241fbda8f3
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.offset.positiveX.worker.js
@@ -0,0 +1,30 @@
+// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
+// OffscreenCanvas test in a worker:2d.shadow.offset.positiveX
+// Description:Shadows can be offset with positive x
+// Note:
+
+importScripts("/resources/testharness.js");
+importScripts("/html/canvas/resources/canvas-tests.js");
+
+var t = async_test("Shadows can be offset with positive x");
+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.fillStyle = '#f00';
+ctx.fillRect(0, 0, 100, 50);
+ctx.fillStyle = '#0f0';
+ctx.shadowColor = '#0f0';
+ctx.shadowOffsetX = 50;
+ctx.fillRect(0, 0, 50, 50);
+_assertPixel(canvas, 25,25, 0,255,0,255);
+_assertPixel(canvas, 75,25, 0,255,0,255);
+t.done();
+
+});
+done();
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.offset.positiveY.html b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.offset.positiveY.html
new file mode 100644
index 0000000000..168b179688
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.offset.positiveY.html
@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>OffscreenCanvas test: 2d.shadow.offset.positiveY</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+
+<h1>2d.shadow.offset.positiveY</h1>
+<p class="desc">Shadows can be offset with positive y</p>
+
+
+<script>
+var t = async_test("Shadows can be offset with positive y");
+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.fillStyle = '#f00';
+ctx.fillRect(0, 0, 100, 50);
+ctx.fillStyle = '#0f0';
+ctx.shadowColor = '#0f0';
+ctx.shadowOffsetY = 25;
+ctx.fillRect(0, 0, 100, 25);
+_assertPixel(canvas, 50,12, 0,255,0,255);
+_assertPixel(canvas, 50,37, 0,255,0,255);
+t.done();
+
+});
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.offset.positiveY.worker.js b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.offset.positiveY.worker.js
new file mode 100644
index 0000000000..b3236d66a5
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.offset.positiveY.worker.js
@@ -0,0 +1,30 @@
+// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
+// OffscreenCanvas test in a worker:2d.shadow.offset.positiveY
+// Description:Shadows can be offset with positive y
+// Note:
+
+importScripts("/resources/testharness.js");
+importScripts("/html/canvas/resources/canvas-tests.js");
+
+var t = async_test("Shadows can be offset with positive y");
+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.fillStyle = '#f00';
+ctx.fillRect(0, 0, 100, 50);
+ctx.fillStyle = '#0f0';
+ctx.shadowColor = '#0f0';
+ctx.shadowOffsetY = 25;
+ctx.fillRect(0, 0, 100, 25);
+_assertPixel(canvas, 50,12, 0,255,0,255);
+_assertPixel(canvas, 50,37, 0,255,0,255);
+t.done();
+
+});
+done();
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.outside.html b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.outside.html
new file mode 100644
index 0000000000..207160d20f
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.outside.html
@@ -0,0 +1,42 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>OffscreenCanvas test: 2d.shadow.outside</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+
+<h1>2d.shadow.outside</h1>
+<p class="desc">Shadows of shapes outside the visible area can be offset onto the visible area</p>
+
+
+<script>
+var t = async_test("Shadows of shapes outside the visible area can be offset onto the visible area");
+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.fillStyle = '#f00';
+ctx.fillRect(0, 0, 100, 50);
+ctx.shadowColor = '#0f0';
+ctx.shadowOffsetX = 100;
+ctx.fillRect(-100, 0, 25, 50);
+ctx.shadowOffsetX = -100;
+ctx.fillRect(175, 0, 25, 50);
+ctx.shadowOffsetX = 0;
+ctx.shadowOffsetY = 100;
+ctx.fillRect(25, -100, 50, 25);
+ctx.shadowOffsetY = -100;
+ctx.fillRect(25, 125, 50, 25);
+_assertPixel(canvas, 12,25, 0,255,0,255);
+_assertPixel(canvas, 87,25, 0,255,0,255);
+_assertPixel(canvas, 50,12, 0,255,0,255);
+_assertPixel(canvas, 50,37, 0,255,0,255);
+t.done();
+
+});
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.outside.worker.js b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.outside.worker.js
new file mode 100644
index 0000000000..d0787d67a4
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.outside.worker.js
@@ -0,0 +1,38 @@
+// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
+// OffscreenCanvas test in a worker:2d.shadow.outside
+// Description:Shadows of shapes outside the visible area can be offset onto the visible area
+// Note:
+
+importScripts("/resources/testharness.js");
+importScripts("/html/canvas/resources/canvas-tests.js");
+
+var t = async_test("Shadows of shapes outside the visible area can be offset onto the visible area");
+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.fillStyle = '#f00';
+ctx.fillRect(0, 0, 100, 50);
+ctx.shadowColor = '#0f0';
+ctx.shadowOffsetX = 100;
+ctx.fillRect(-100, 0, 25, 50);
+ctx.shadowOffsetX = -100;
+ctx.fillRect(175, 0, 25, 50);
+ctx.shadowOffsetX = 0;
+ctx.shadowOffsetY = 100;
+ctx.fillRect(25, -100, 50, 25);
+ctx.shadowOffsetY = -100;
+ctx.fillRect(25, 125, 50, 25);
+_assertPixel(canvas, 12,25, 0,255,0,255);
+_assertPixel(canvas, 87,25, 0,255,0,255);
+_assertPixel(canvas, 50,12, 0,255,0,255);
+_assertPixel(canvas, 50,37, 0,255,0,255);
+t.done();
+
+});
+done();
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.pattern.alpha.html b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.pattern.alpha.html
new file mode 100644
index 0000000000..48615eadcf
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.pattern.alpha.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>OffscreenCanvas test: 2d.shadow.pattern.alpha</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+
+<h1>2d.shadow.pattern.alpha</h1>
+<p class="desc">Shadows are drawn correctly for partially-transparent fill patterns</p>
+
+
+<script>
+var t = async_test("Shadows are drawn correctly for partially-transparent fill patterns");
+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');
+
+var promise = new Promise(function(resolve, reject) {
+    var xhr = new XMLHttpRequest();
+    xhr.open("GET", '/images/transparent50.png');
+    xhr.responseType = 'blob';
+    xhr.send();
+    xhr.onload = function() {
+        resolve(xhr.response);
+    };
+});
+promise.then(function(response) {
+    createImageBitmap(response).then(bitmap => {
+        var pattern = ctx.createPattern(bitmap, 'repeat');
+        ctx.fillStyle = '#f00';
+        ctx.fillRect(0, 0, 100, 50);
+        ctx.shadowOffsetY = 50;
+        ctx.shadowColor = '#00f';
+        ctx.fillStyle = pattern;
+        ctx.fillRect(0, -50, 100, 50);
+    }, t_fail);
+}).then(t_pass, t_fail);
+
+});
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.pattern.alpha.worker.js b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.pattern.alpha.worker.js
new file mode 100644
index 0000000000..6a533845ab
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.pattern.alpha.worker.js
@@ -0,0 +1,41 @@
+// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
+// OffscreenCanvas test in a worker:2d.shadow.pattern.alpha
+// Description:Shadows are drawn correctly for partially-transparent fill patterns
+// Note:
+
+importScripts("/resources/testharness.js");
+importScripts("/html/canvas/resources/canvas-tests.js");
+
+var t = async_test("Shadows are drawn correctly for partially-transparent fill patterns");
+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');
+
+var promise = new Promise(function(resolve, reject) {
+    var xhr = new XMLHttpRequest();
+    xhr.open("GET", '/images/transparent50.png');
+    xhr.responseType = 'blob';
+    xhr.send();
+    xhr.onload = function() {
+        resolve(xhr.response);
+    };
+});
+promise.then(function(response) {
+    createImageBitmap(response).then(bitmap => {
+        var pattern = ctx.createPattern(bitmap, 'repeat');
+        ctx.fillStyle = '#f00';
+        ctx.fillRect(0, 0, 100, 50);
+        ctx.shadowOffsetY = 50;
+        ctx.shadowColor = '#00f';
+        ctx.fillStyle = pattern;
+        ctx.fillRect(0, -50, 100, 50);
+    }, t_fail);
+}).then(t_pass, t_fail);
+
+});
+done();
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.pattern.basic.html b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.pattern.basic.html
new file mode 100644
index 0000000000..586f7ef336
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.pattern.basic.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>OffscreenCanvas test: 2d.shadow.pattern.basic</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+
+<h1>2d.shadow.pattern.basic</h1>
+<p class="desc">Shadows are drawn for fill patterns</p>
+
+
+<script>
+var t = async_test("Shadows are drawn for fill patterns");
+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');
+
+var promise = new Promise(function(resolve, reject) {
+    var xhr = new XMLHttpRequest();
+    xhr.open("GET", '/images/red.png');
+    xhr.responseType = 'blob';
+    xhr.send();
+    xhr.onload = function() {
+        resolve(xhr.response);
+    };
+});
+promise.then(function(response) {
+    createImageBitmap(response).then(bitmap => {
+        var pattern = ctx.createPattern(bitmap, 'repeat');
+        ctx.fillStyle = '#f00';
+        ctx.fillRect(0, 0, 100, 50);
+        ctx.shadowColor = '#0f0';
+        ctx.shadowOffsetY = 50;
+        ctx.fillStyle = pattern;
+        ctx.fillRect(0, -50, 100, 50);
+    }, t_fail);
+}).then(t_pass, t_fail);
+
+});
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.pattern.basic.worker.js b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.pattern.basic.worker.js
new file mode 100644
index 0000000000..6d2dce7c1b
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.pattern.basic.worker.js
@@ -0,0 +1,41 @@
+// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
+// OffscreenCanvas test in a worker:2d.shadow.pattern.basic
+// Description:Shadows are drawn for fill patterns
+// Note:
+
+importScripts("/resources/testharness.js");
+importScripts("/html/canvas/resources/canvas-tests.js");
+
+var t = async_test("Shadows are drawn for fill patterns");
+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');
+
+var promise = new Promise(function(resolve, reject) {
+    var xhr = new XMLHttpRequest();
+    xhr.open("GET", '/images/red.png');
+    xhr.responseType = 'blob';
+    xhr.send();
+    xhr.onload = function() {
+        resolve(xhr.response);
+    };
+});
+promise.then(function(response) {
+    createImageBitmap(response).then(bitmap => {
+        var pattern = ctx.createPattern(bitmap, 'repeat');
+        ctx.fillStyle = '#f00';
+        ctx.fillRect(0, 0, 100, 50);
+        ctx.shadowColor = '#0f0';
+        ctx.shadowOffsetY = 50;
+        ctx.fillStyle = pattern;
+        ctx.fillRect(0, -50, 100, 50);
+    }, t_fail);
+}).then(t_pass, t_fail);
+
+});
+done();
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.pattern.transparent.1.html b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.pattern.transparent.1.html
new file mode 100644
index 0000000000..6d97b590af
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.pattern.transparent.1.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>OffscreenCanvas test: 2d.shadow.pattern.transparent.1</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+
+<h1>2d.shadow.pattern.transparent.1</h1>
+<p class="desc">Shadows are not drawn for transparent fill patterns</p>
+
+
+<script>
+var t = async_test("Shadows are not drawn for transparent fill patterns");
+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');
+
+var promise = new Promise(function(resolve, reject) {
+    var xhr = new XMLHttpRequest();
+    xhr.open("GET", '/images/transparent.png');
+    xhr.responseType = 'blob';
+    xhr.send();
+    xhr.onload = function() {
+        resolve(xhr.response);
+    };
+});
+promise.then(function(response) {
+    createImageBitmap(response).then(bitmap => {
+        var pattern = ctx.createPattern(bitmap, 'repeat');
+        ctx.fillStyle = '#0f0';
+        ctx.fillRect(0, 0, 100, 50);
+        ctx.shadowColor = '#f00';
+        ctx.shadowOffsetY = 50;
+        ctx.fillStyle = pattern;
+        ctx.fillRect(0, -50, 100, 50);
+    }, t_fail);
+}).then(t_pass, t_fail);
+
+});
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.pattern.transparent.1.worker.js b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.pattern.transparent.1.worker.js
new file mode 100644
index 0000000000..cda0aa956d
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.pattern.transparent.1.worker.js
@@ -0,0 +1,41 @@
+// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
+// OffscreenCanvas test in a worker:2d.shadow.pattern.transparent.1
+// Description:Shadows are not drawn for transparent fill patterns
+// Note:
+
+importScripts("/resources/testharness.js");
+importScripts("/html/canvas/resources/canvas-tests.js");
+
+var t = async_test("Shadows are not drawn for transparent fill patterns");
+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');
+
+var promise = new Promise(function(resolve, reject) {
+    var xhr = new XMLHttpRequest();
+    xhr.open("GET", '/images/transparent.png');
+    xhr.responseType = 'blob';
+    xhr.send();
+    xhr.onload = function() {
+        resolve(xhr.response);
+    };
+});
+promise.then(function(response) {
+    createImageBitmap(response).then(bitmap => {
+        var pattern = ctx.createPattern(bitmap, 'repeat');
+        ctx.fillStyle = '#0f0';
+        ctx.fillRect(0, 0, 100, 50);
+        ctx.shadowColor = '#f00';
+        ctx.shadowOffsetY = 50;
+        ctx.fillStyle = pattern;
+        ctx.fillRect(0, -50, 100, 50);
+    }, t_fail);
+}).then(t_pass, t_fail);
+
+});
+done();
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.pattern.transparent.2.html b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.pattern.transparent.2.html
new file mode 100644
index 0000000000..600fbd03ff
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.pattern.transparent.2.html
@@ -0,0 +1,50 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>OffscreenCanvas test: 2d.shadow.pattern.transparent.2</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+
+<h1>2d.shadow.pattern.transparent.2</h1>
+<p class="desc">Shadows are not drawn for transparent parts of fill patterns</p>
+
+
+<script>
+var t = async_test("Shadows are not drawn for transparent parts of fill patterns");
+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');
+
+var promise = new Promise(function(resolve, reject) {
+    var xhr = new XMLHttpRequest();
+    xhr.open("GET", '/images/redtransparent.png');
+    xhr.responseType = 'blob';
+    xhr.send();
+    xhr.onload = function() {
+        resolve(xhr.response);
+    };
+});
+promise.then(function(response) {
+    createImageBitmap(response).then(bitmap => {
+        var pattern = ctx.createPattern(bitmap, 'repeat');
+        ctx.fillStyle = '#f00';
+        ctx.fillRect(0, 0, 50, 50);
+        ctx.fillStyle = '#0f0';
+        ctx.fillRect(50, 0, 50, 50);
+        ctx.shadowOffsetY = 50;
+        ctx.shadowColor = '#0f0';
+        ctx.fillStyle = pattern;
+        ctx.fillRect(0, -50, 100, 50);
+        _assertPixel(canvas, 25,25, 0,255,0,255);
+        _assertPixel(canvas, 50,25, 0,255,0,255);
+        _assertPixel(canvas, 75,25, 0,255,0,255);
+    }, t_fail);
+}).then(t_pass, t_fail);
+
+});
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.pattern.transparent.2.worker.js b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.pattern.transparent.2.worker.js
new file mode 100644
index 0000000000..2aa3166146
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.pattern.transparent.2.worker.js
@@ -0,0 +1,46 @@
+// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
+// OffscreenCanvas test in a worker:2d.shadow.pattern.transparent.2
+// Description:Shadows are not drawn for transparent parts of fill patterns
+// Note:
+
+importScripts("/resources/testharness.js");
+importScripts("/html/canvas/resources/canvas-tests.js");
+
+var t = async_test("Shadows are not drawn for transparent parts of fill patterns");
+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');
+
+var promise = new Promise(function(resolve, reject) {
+    var xhr = new XMLHttpRequest();
+    xhr.open("GET", '/images/redtransparent.png');
+    xhr.responseType = 'blob';
+    xhr.send();
+    xhr.onload = function() {
+        resolve(xhr.response);
+    };
+});
+promise.then(function(response) {
+    createImageBitmap(response).then(bitmap => {
+        var pattern = ctx.createPattern(bitmap, 'repeat');
+        ctx.fillStyle = '#f00';
+        ctx.fillRect(0, 0, 50, 50);
+        ctx.fillStyle = '#0f0';
+        ctx.fillRect(50, 0, 50, 50);
+        ctx.shadowOffsetY = 50;
+        ctx.shadowColor = '#0f0';
+        ctx.fillStyle = pattern;
+        ctx.fillRect(0, -50, 100, 50);
+        _assertPixel(canvas, 25,25, 0,255,0,255);
+        _assertPixel(canvas, 50,25, 0,255,0,255);
+        _assertPixel(canvas, 75,25, 0,255,0,255);
+    }, t_fail);
+}).then(t_pass, t_fail);
+
+});
+done();
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.stroke.basic.html b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.stroke.basic.html
new file mode 100644
index 0000000000..2711025134
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.stroke.basic.html
@@ -0,0 +1,39 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>OffscreenCanvas test: 2d.shadow.stroke.basic</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+
+<h1>2d.shadow.stroke.basic</h1>
+<p class="desc">Shadows are drawn for strokes</p>
+
+
+<script>
+var t = async_test("Shadows are drawn for strokes");
+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.fillStyle = '#f00';
+ctx.fillRect(0, 0, 100, 50);
+ctx.strokeStyle = '#f00';
+ctx.shadowColor = '#0f0';
+ctx.shadowOffsetY = 50;
+ctx.beginPath();
+ctx.lineWidth = 50;
+ctx.moveTo(0, -25);
+ctx.lineTo(100, -25);
+ctx.stroke();
+_assertPixel(canvas, 1,25, 0,255,0,255);
+_assertPixel(canvas, 50,25, 0,255,0,255);
+_assertPixel(canvas, 98,25, 0,255,0,255);
+t.done();
+
+});
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.stroke.basic.worker.js b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.stroke.basic.worker.js
new file mode 100644
index 0000000000..7ebbd8ec5b
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.stroke.basic.worker.js
@@ -0,0 +1,35 @@
+// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
+// OffscreenCanvas test in a worker:2d.shadow.stroke.basic
+// Description:Shadows are drawn for strokes
+// Note:
+
+importScripts("/resources/testharness.js");
+importScripts("/html/canvas/resources/canvas-tests.js");
+
+var t = async_test("Shadows are drawn for strokes");
+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.fillStyle = '#f00';
+ctx.fillRect(0, 0, 100, 50);
+ctx.strokeStyle = '#f00';
+ctx.shadowColor = '#0f0';
+ctx.shadowOffsetY = 50;
+ctx.beginPath();
+ctx.lineWidth = 50;
+ctx.moveTo(0, -25);
+ctx.lineTo(100, -25);
+ctx.stroke();
+_assertPixel(canvas, 1,25, 0,255,0,255);
+_assertPixel(canvas, 50,25, 0,255,0,255);
+_assertPixel(canvas, 98,25, 0,255,0,255);
+t.done();
+
+});
+done();
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.stroke.cap.1.html b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.stroke.cap.1.html
new file mode 100644
index 0000000000..3854669bf0
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.stroke.cap.1.html
@@ -0,0 +1,42 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>OffscreenCanvas test: 2d.shadow.stroke.cap.1</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+
+<h1>2d.shadow.stroke.cap.1</h1>
+<p class="desc">Shadows are not drawn for areas outside stroke caps</p>
+
+
+<script>
+var t = async_test("Shadows are not drawn for areas outside stroke caps");
+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.fillStyle = '#0f0';
+ctx.fillRect(0, 0, 100, 50);
+ctx.strokeStyle = '#f00';
+ctx.shadowColor = '#f00';
+ctx.shadowOffsetY = 50;
+ctx.beginPath();
+ctx.lineWidth = 50;
+ctx.lineCap = 'butt';
+ctx.moveTo(-50, -25);
+ctx.lineTo(0, -25);
+ctx.moveTo(100, -25);
+ctx.lineTo(150, -25);
+ctx.stroke();
+_assertPixel(canvas, 1,25, 0,255,0,255);
+_assertPixel(canvas, 50,25, 0,255,0,255);
+_assertPixel(canvas, 98,25, 0,255,0,255);
+t.done();
+
+});
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.stroke.cap.1.worker.js b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.stroke.cap.1.worker.js
new file mode 100644
index 0000000000..7ecd07b1cd
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.stroke.cap.1.worker.js
@@ -0,0 +1,38 @@
+// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
+// OffscreenCanvas test in a worker:2d.shadow.stroke.cap.1
+// Description:Shadows are not drawn for areas outside stroke caps
+// Note:
+
+importScripts("/resources/testharness.js");
+importScripts("/html/canvas/resources/canvas-tests.js");
+
+var t = async_test("Shadows are not drawn for areas outside stroke caps");
+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.fillStyle = '#0f0';
+ctx.fillRect(0, 0, 100, 50);
+ctx.strokeStyle = '#f00';
+ctx.shadowColor = '#f00';
+ctx.shadowOffsetY = 50;
+ctx.beginPath();
+ctx.lineWidth = 50;
+ctx.lineCap = 'butt';
+ctx.moveTo(-50, -25);
+ctx.lineTo(0, -25);
+ctx.moveTo(100, -25);
+ctx.lineTo(150, -25);
+ctx.stroke();
+_assertPixel(canvas, 1,25, 0,255,0,255);
+_assertPixel(canvas, 50,25, 0,255,0,255);
+_assertPixel(canvas, 98,25, 0,255,0,255);
+t.done();
+
+});
+done();
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.stroke.cap.2.html b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.stroke.cap.2.html
new file mode 100644
index 0000000000..bd18ec6f8c
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.stroke.cap.2.html
@@ -0,0 +1,40 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>OffscreenCanvas test: 2d.shadow.stroke.cap.2</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+
+<h1>2d.shadow.stroke.cap.2</h1>
+<p class="desc">Shadows are drawn for stroke caps</p>
+
+
+<script>
+var t = async_test("Shadows are drawn for stroke caps");
+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.fillStyle = '#f00';
+ctx.fillRect(0, 0, 100, 50);
+ctx.strokeStyle = '#f00';
+ctx.shadowColor = '#0f0';
+ctx.shadowOffsetY = 50;
+ctx.beginPath();
+ctx.lineWidth = 50;
+ctx.lineCap = 'square';
+ctx.moveTo(25, -25);
+ctx.lineTo(75, -25);
+ctx.stroke();
+_assertPixel(canvas, 1,25, 0,255,0,255);
+_assertPixel(canvas, 50,25, 0,255,0,255);
+_assertPixel(canvas, 98,25, 0,255,0,255);
+t.done();
+
+});
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.stroke.cap.2.worker.js b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.stroke.cap.2.worker.js
new file mode 100644
index 0000000000..7c7dc26dd9
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.stroke.cap.2.worker.js
@@ -0,0 +1,36 @@
+// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
+// OffscreenCanvas test in a worker:2d.shadow.stroke.cap.2
+// Description:Shadows are drawn for stroke caps
+// Note:
+
+importScripts("/resources/testharness.js");
+importScripts("/html/canvas/resources/canvas-tests.js");
+
+var t = async_test("Shadows are drawn for stroke caps");
+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.fillStyle = '#f00';
+ctx.fillRect(0, 0, 100, 50);
+ctx.strokeStyle = '#f00';
+ctx.shadowColor = '#0f0';
+ctx.shadowOffsetY = 50;
+ctx.beginPath();
+ctx.lineWidth = 50;
+ctx.lineCap = 'square';
+ctx.moveTo(25, -25);
+ctx.lineTo(75, -25);
+ctx.stroke();
+_assertPixel(canvas, 1,25, 0,255,0,255);
+_assertPixel(canvas, 50,25, 0,255,0,255);
+_assertPixel(canvas, 98,25, 0,255,0,255);
+t.done();
+
+});
+done();
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.stroke.join.1.html b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.stroke.join.1.html
new file mode 100644
index 0000000000..8faa2fef08
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.stroke.join.1.html
@@ -0,0 +1,42 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>OffscreenCanvas test: 2d.shadow.stroke.join.1</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+
+<h1>2d.shadow.stroke.join.1</h1>
+<p class="desc">Shadows are not drawn for areas outside stroke joins</p>
+
+
+<script>
+var t = async_test("Shadows are not drawn for areas outside stroke joins");
+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.fillStyle = '#0f0';
+ctx.fillRect(0, 0, 100, 50);
+ctx.strokeStyle = '#f00';
+ctx.shadowColor = '#f00';
+ctx.shadowOffsetX = 100;
+ctx.lineWidth = 200;
+ctx.lineJoin = 'bevel';
+ctx.beginPath();
+ctx.moveTo(-200, -50);
+ctx.lineTo(-150, -50);
+ctx.lineTo(-151, -100);
+ctx.stroke();
+_assertPixel(canvas, 1,1, 0,255,0,255);
+_assertPixel(canvas, 48,48, 0,255,0,255);
+_assertPixel(canvas, 50,25, 0,255,0,255);
+_assertPixel(canvas, 98,48, 0,255,0,255);
+t.done();
+
+});
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.stroke.join.1.worker.js b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.stroke.join.1.worker.js
new file mode 100644
index 0000000000..e81a9b212d
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.stroke.join.1.worker.js
@@ -0,0 +1,38 @@
+// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
+// OffscreenCanvas test in a worker:2d.shadow.stroke.join.1
+// Description:Shadows are not drawn for areas outside stroke joins
+// Note:
+
+importScripts("/resources/testharness.js");
+importScripts("/html/canvas/resources/canvas-tests.js");
+
+var t = async_test("Shadows are not drawn for areas outside stroke joins");
+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.fillStyle = '#0f0';
+ctx.fillRect(0, 0, 100, 50);
+ctx.strokeStyle = '#f00';
+ctx.shadowColor = '#f00';
+ctx.shadowOffsetX = 100;
+ctx.lineWidth = 200;
+ctx.lineJoin = 'bevel';
+ctx.beginPath();
+ctx.moveTo(-200, -50);
+ctx.lineTo(-150, -50);
+ctx.lineTo(-151, -100);
+ctx.stroke();
+_assertPixel(canvas, 1,1, 0,255,0,255);
+_assertPixel(canvas, 48,48, 0,255,0,255);
+_assertPixel(canvas, 50,25, 0,255,0,255);
+_assertPixel(canvas, 98,48, 0,255,0,255);
+t.done();
+
+});
+done();
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.stroke.join.2.html b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.stroke.join.2.html
new file mode 100644
index 0000000000..7b52a7c950
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.stroke.join.2.html
@@ -0,0 +1,44 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>OffscreenCanvas test: 2d.shadow.stroke.join.2</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+
+<h1>2d.shadow.stroke.join.2</h1>
+<p class="desc">Shadows are drawn for stroke joins</p>
+
+
+<script>
+var t = async_test("Shadows are drawn for stroke joins");
+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.fillStyle = '#f00';
+ctx.fillRect(0, 0, 50, 50);
+ctx.fillStyle = '#0f0';
+ctx.fillRect(50, 0, 50, 50);
+ctx.strokeStyle = '#f00';
+ctx.shadowColor = '#0f0';
+ctx.shadowOffsetX = 100;
+ctx.lineWidth = 200;
+ctx.lineJoin = 'miter';
+ctx.beginPath();
+ctx.moveTo(-200, -50);
+ctx.lineTo(-150, -50);
+ctx.lineTo(-151, -100);
+ctx.stroke();
+_assertPixel(canvas, 1,1, 0,255,0,255);
+_assertPixel(canvas, 48,48, 0,255,0,255);
+_assertPixel(canvas, 50,25, 0,255,0,255);
+_assertPixel(canvas, 98,48, 0,255,0,255);
+t.done();
+
+});
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.stroke.join.2.worker.js b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.stroke.join.2.worker.js
new file mode 100644
index 0000000000..269a49d76c
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.stroke.join.2.worker.js
@@ -0,0 +1,40 @@
+// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
+// OffscreenCanvas test in a worker:2d.shadow.stroke.join.2
+// Description:Shadows are drawn for stroke joins
+// Note:
+
+importScripts("/resources/testharness.js");
+importScripts("/html/canvas/resources/canvas-tests.js");
+
+var t = async_test("Shadows are drawn for stroke joins");
+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.fillStyle = '#f00';
+ctx.fillRect(0, 0, 50, 50);
+ctx.fillStyle = '#0f0';
+ctx.fillRect(50, 0, 50, 50);
+ctx.strokeStyle = '#f00';
+ctx.shadowColor = '#0f0';
+ctx.shadowOffsetX = 100;
+ctx.lineWidth = 200;
+ctx.lineJoin = 'miter';
+ctx.beginPath();
+ctx.moveTo(-200, -50);
+ctx.lineTo(-150, -50);
+ctx.lineTo(-151, -100);
+ctx.stroke();
+_assertPixel(canvas, 1,1, 0,255,0,255);
+_assertPixel(canvas, 48,48, 0,255,0,255);
+_assertPixel(canvas, 50,25, 0,255,0,255);
+_assertPixel(canvas, 98,48, 0,255,0,255);
+t.done();
+
+});
+done();
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.stroke.join.3.html b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.stroke.join.3.html
new file mode 100644
index 0000000000..6110d3ae40
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.stroke.join.3.html
@@ -0,0 +1,43 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>OffscreenCanvas test: 2d.shadow.stroke.join.3</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+
+<h1>2d.shadow.stroke.join.3</h1>
+<p class="desc">Shadows are drawn for stroke joins respecting miter limit</p>
+
+
+<script>
+var t = async_test("Shadows are drawn for stroke joins respecting miter limit");
+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.fillStyle = '#0f0';
+ctx.fillRect(0, 0, 100, 50);
+ctx.strokeStyle = '#f00';
+ctx.shadowColor = '#f00';
+ctx.shadowOffsetX = 100;
+ctx.lineWidth = 200;
+ctx.lineJoin = 'miter';
+ctx.miterLimit = 0.1;
+ctx.beginPath();
+ctx.moveTo(-200, -50);
+ctx.lineTo(-150, -50);
+ctx.lineTo(-151, -100); // (not an exact right angle, to avoid some other bug in Firefox 3)
+ctx.stroke();
+_assertPixel(canvas, 1,1, 0,255,0,255);
+_assertPixel(canvas, 48,48, 0,255,0,255);
+_assertPixel(canvas, 50,25, 0,255,0,255);
+_assertPixel(canvas, 98,48, 0,255,0,255);
+t.done();
+
+});
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.stroke.join.3.worker.js b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.stroke.join.3.worker.js
new file mode 100644
index 0000000000..43144b0fd9
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.stroke.join.3.worker.js
@@ -0,0 +1,39 @@
+// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
+// OffscreenCanvas test in a worker:2d.shadow.stroke.join.3
+// Description:Shadows are drawn for stroke joins respecting miter limit
+// Note:
+
+importScripts("/resources/testharness.js");
+importScripts("/html/canvas/resources/canvas-tests.js");
+
+var t = async_test("Shadows are drawn for stroke joins respecting miter limit");
+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.fillStyle = '#0f0';
+ctx.fillRect(0, 0, 100, 50);
+ctx.strokeStyle = '#f00';
+ctx.shadowColor = '#f00';
+ctx.shadowOffsetX = 100;
+ctx.lineWidth = 200;
+ctx.lineJoin = 'miter';
+ctx.miterLimit = 0.1;
+ctx.beginPath();
+ctx.moveTo(-200, -50);
+ctx.lineTo(-150, -50);
+ctx.lineTo(-151, -100); // (not an exact right angle, to avoid some other bug in Firefox 3)
+ctx.stroke();
+_assertPixel(canvas, 1,1, 0,255,0,255);
+_assertPixel(canvas, 48,48, 0,255,0,255);
+_assertPixel(canvas, 50,25, 0,255,0,255);
+_assertPixel(canvas, 98,48, 0,255,0,255);
+t.done();
+
+});
+done();
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.transform.1.html b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.transform.1.html
new file mode 100644
index 0000000000..d6c4e483ba
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.transform.1.html
@@ -0,0 +1,33 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>OffscreenCanvas test: 2d.shadow.transform.1</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+
+<h1>2d.shadow.transform.1</h1>
+<p class="desc">Shadows take account of transformations</p>
+
+
+<script>
+var t = async_test("Shadows take account of transformations");
+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.fillStyle = '#f00';
+ctx.fillRect(0, 0, 100, 50);
+ctx.shadowOffsetY = 50;
+ctx.shadowColor = '#0f0';
+ctx.translate(100, 100);
+ctx.fillRect(-100, -150, 100, 50);
+_assertPixel(canvas, 50,25, 0,255,0,255);
+t.done();
+
+});
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.transform.1.worker.js b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.transform.1.worker.js
new file mode 100644
index 0000000000..38cdf7eb7c
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.transform.1.worker.js
@@ -0,0 +1,29 @@
+// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
+// OffscreenCanvas test in a worker:2d.shadow.transform.1
+// Description:Shadows take account of transformations
+// Note:
+
+importScripts("/resources/testharness.js");
+importScripts("/html/canvas/resources/canvas-tests.js");
+
+var t = async_test("Shadows take account of transformations");
+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.fillStyle = '#f00';
+ctx.fillRect(0, 0, 100, 50);
+ctx.shadowOffsetY = 50;
+ctx.shadowColor = '#0f0';
+ctx.translate(100, 100);
+ctx.fillRect(-100, -150, 100, 50);
+_assertPixel(canvas, 50,25, 0,255,0,255);
+t.done();
+
+});
+done();
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.transform.2.html b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.transform.2.html
new file mode 100644
index 0000000000..f0b1607262
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.transform.2.html
@@ -0,0 +1,33 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>OffscreenCanvas test: 2d.shadow.transform.2</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+
+<h1>2d.shadow.transform.2</h1>
+<p class="desc">Shadow offsets are not affected by transformations</p>
+
+
+<script>
+var t = async_test("Shadow offsets are not affected by transformations");
+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.fillStyle = '#f00';
+ctx.fillRect(0, 0, 100, 50);
+ctx.shadowOffsetY = 50;
+ctx.shadowColor = '#0f0';
+ctx.rotate(Math.PI)
+ctx.fillRect(-100, 0, 100, 50);
+_assertPixel(canvas, 50,25, 0,255,0,255);
+t.done();
+
+});
+</script>
diff --git a/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.transform.2.worker.js b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.transform.2.worker.js
new file mode 100644
index 0000000000..9f204d2439
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/shadows/2d.shadow.transform.2.worker.js
@@ -0,0 +1,29 @@
+// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
+// OffscreenCanvas test in a worker:2d.shadow.transform.2
+// Description:Shadow offsets are not affected by transformations
+// Note:
+
+importScripts("/resources/testharness.js");
+importScripts("/html/canvas/resources/canvas-tests.js");
+
+var t = async_test("Shadow offsets are not affected by transformations");
+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.fillStyle = '#f00';
+ctx.fillRect(0, 0, 100, 50);
+ctx.shadowOffsetY = 50;
+ctx.shadowColor = '#0f0';
+ctx.rotate(Math.PI)
+ctx.fillRect(-100, 0, 100, 50);
+_assertPixel(canvas, 50,25, 0,255,0,255);
+t.done();
+
+});
+done();
author	Daniel Baumann <daniel.baumann@progress-linux.org>	2024-04-07 09:22:09 +0000
committer	Daniel Baumann <daniel.baumann@progress-linux.org>	2024-04-07 09:22:09 +0000
commit	43a97878ce14b72f0981164f87f2e35e14151312 (patch)
tree	620249daf56c0258faa40cbdcf9cfba06de2a846 /testing/web-platform/tests/html/canvas/offscreen/shadows
parent	Initial commit. (diff)
download	firefox-43a97878ce14b72f0981164f87f2e35e14151312.tar.xz firefox-43a97878ce14b72f0981164f87f2e35e14151312.zip