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diff --git a/testing/web-platform/tests/html/canvas/offscreen/fill-and-stroke-styles/2d.fillStyle.CSSRGB.html b/testing/web-platform/tests/html/canvas/offscreen/fill-and-stroke-styles/2d.fillStyle.CSSRGB.html
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+++ b/testing/web-platform/tests/html/canvas/offscreen/fill-and-stroke-styles/2d.fillStyle.CSSRGB.html
@@ -0,0 +1,60 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>OffscreenCanvas test: 2d.fillStyle.CSSRGB</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+
+<h1>2d.fillStyle.CSSRGB</h1>
+<p class="desc">CSSRGB works as color input</p>
+
+
+<script>
+var t = async_test("CSSRGB works as color input");
+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 = new CSSRGB(1, 0, 1);
+  _assertSame(ctx.fillStyle, '#ff00ff', "ctx.fillStyle", "'#ff00ff'");
+  ctx.fillRect(0, 0, 100, 50);
+  _assertPixel(canvas, 50,25, 255,0,255,255);
+
+  const color = new CSSRGB(0, CSS.percent(50), 0);
+  ctx.fillStyle = color;
+  _assertSame(ctx.fillStyle, '#008000', "ctx.fillStyle", "'#008000'");
+  ctx.fillRect(0, 0, 100, 50);
+  _assertPixel(canvas, 50,25, 0,128,0,255);
+  color.g = 0;
+  ctx.fillStyle = color;
+  _assertSame(ctx.fillStyle, '#000000', "ctx.fillStyle", "'#000000'");
+  ctx.fillRect(0, 0, 100, 50);
+  _assertPixel(canvas, 50,25, 0,0,0,255);
+
+  color.alpha = 0;
+  ctx.fillStyle = color;
+  _assertSame(ctx.fillStyle, 'rgba(0, 0, 0, 0)', "ctx.fillStyle", "'rgba(0, 0, 0, 0)'");
+  ctx.reset();
+  color.alpha = 0.5;
+  ctx.fillStyle = color;
+  ctx.fillRect(0, 0, 100, 50);
+  _assertPixel(canvas, 50,25, 0,0,0,128);
+
+  ctx.fillStyle = new CSSHSL(CSS.deg(0), 1, 1).toRGB();
+  _assertSame(ctx.fillStyle, '#ffffff', "ctx.fillStyle", "'#ffffff'");
+  ctx.fillRect(0, 0, 100, 50);
+  _assertPixel(canvas, 50,25, 255,255,255,255);
+
+  color.alpha = 1;
+  color.g = 1;
+  ctx.fillStyle = color;
+  ctx.fillRect(0, 0, 100, 50);
+  t.done();
+
+});
+</script>