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diff --git a/testing/web-platform/tests/html/canvas/offscreen/fill-and-stroke-styles/2d.gradient.conic.invalid.inputs.html b/testing/web-platform/tests/html/canvas/offscreen/fill-and-stroke-styles/2d.gradient.conic.invalid.inputs.html
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index 0000000000..5ccb19e09c
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+++ b/testing/web-platform/tests/html/canvas/offscreen/fill-and-stroke-styles/2d.gradient.conic.invalid.inputs.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.gradient.conic.invalid.inputs</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+
+<h1>2d.gradient.conic.invalid.inputs</h1>
+<p class="desc">Conic gradient function with invalid inputs</p>
+
+
+<script>
+var t = async_test("Conic gradient function with invalid inputs");
+var t_pass = t.done.bind(t);
+var t_fail = t.step_func(function(reason) {
+    throw reason;
+});
+t.step(function() {
+
+  var canvas = new OffscreenCanvas(100, 50);
+  var ctx = canvas.getContext('2d');
+
+  assert_throws_js(TypeError, function() { ctx.createConicGradient(Infinity, 0, 1); });
+  assert_throws_js(TypeError, function() { ctx.createConicGradient(-Infinity, 0, 1); });
+  assert_throws_js(TypeError, function() { ctx.createConicGradient(NaN, 0, 1); });
+  assert_throws_js(TypeError, function() { ctx.createConicGradient(0, Infinity, 1); });
+  assert_throws_js(TypeError, function() { ctx.createConicGradient(0, -Infinity, 1); });
+  assert_throws_js(TypeError, function() { ctx.createConicGradient(0, NaN, 1); });
+  assert_throws_js(TypeError, function() { ctx.createConicGradient(0, 0, Infinity); });
+  assert_throws_js(TypeError, function() { ctx.createConicGradient(0, 0, -Infinity); });
+  assert_throws_js(TypeError, function() { ctx.createConicGradient(0, 0, NaN); });
+  assert_throws_js(TypeError, function() { ctx.createConicGradient(Infinity, Infinity, 1); });
+  assert_throws_js(TypeError, function() { ctx.createConicGradient(Infinity, Infinity, Infinity); });
+  assert_throws_js(TypeError, function() { ctx.createConicGradient(Infinity, 0, Infinity); });
+  assert_throws_js(TypeError, function() { ctx.createConicGradient(0, Infinity, Infinity); });
+
+  const g = ctx.createConicGradient(0, 0, 25);
+  assert_throws_js(TypeError, function() { g.addColorStop(-Infinity, '#f00'); });
+  assert_throws_js(TypeError, function() { g.addColorStop(NaN, '#f00'); });
+  assert_throws_dom("SYNTAX_ERR", function() { g.addColorStop(0, -Infinity); });
+  assert_throws_dom("SYNTAX_ERR", function() { g.addColorStop(0, NaN); });
+  t.done();
+
+});
+</script>