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diff --git a/testing/web-platform/tests/html/canvas/offscreen/fill-and-stroke-styles/2d.fillStyle.toStringFunctionCallback.html b/testing/web-platform/tests/html/canvas/offscreen/fill-and-stroke-styles/2d.fillStyle.toStringFunctionCallback.html
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index 0000000000..3e56bd2b62
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/fill-and-stroke-styles/2d.fillStyle.toStringFunctionCallback.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.fillStyle.toStringFunctionCallback</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.toStringFunctionCallback</h1>
+<p class="desc">Passing a function in to ctx.fillStyle or ctx.strokeStyle with a toString callback works as specified</p>
+
+
+<script>
+var t = async_test("Passing a function in to ctx.fillStyle or ctx.strokeStyle with a toString callback works as specified");
+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 = { toString: function() { return "#008000"; } };
+  _assertSame(ctx.fillStyle, "#008000", "ctx.fillStyle", "\"#008000\"");
+  ctx.fillStyle = {};
+  _assertSame(ctx.fillStyle, "#008000", "ctx.fillStyle", "\"#008000\"");
+  ctx.fillStyle = 800000;
+  _assertSame(ctx.fillStyle, "#008000", "ctx.fillStyle", "\"#008000\"");
+  assert_throws_js(TypeError, function() { ctx.fillStyle = { toString: function() { throw new TypeError; } }; });
+  ctx.strokeStyle = { toString: function() { return "#008000"; } };
+  _assertSame(ctx.strokeStyle, "#008000", "ctx.strokeStyle", "\"#008000\"");
+  ctx.strokeStyle = {};
+  _assertSame(ctx.strokeStyle, "#008000", "ctx.strokeStyle", "\"#008000\"");
+  ctx.strokeStyle = 800000;
+  _assertSame(ctx.strokeStyle, "#008000", "ctx.strokeStyle", "\"#008000\"");
+  assert_throws_js(TypeError, function() { ctx.strokeStyle = { toString: function() { throw new TypeError; } }; });
+  t.done();
+
+});
+</script>