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diff --git a/testing/web-platform/tests/html/canvas/element/path-objects/2d.path.roundrect.badinput.html b/testing/web-platform/tests/html/canvas/element/path-objects/2d.path.roundrect.badinput.html
new file mode 100644
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+++ b/testing/web-platform/tests/html/canvas/element/path-objects/2d.path.roundrect.badinput.html
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+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>Canvas test: 2d.path.roundrect.badinput</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+<link rel="stylesheet" href="/html/canvas/resources/canvas-tests.css">
+<body class="show_output">
+
+<h1>2d.path.roundrect.badinput</h1>
+<p class="desc">roundRect() throws or does not throw errors given the strange inputs.</p>
+
+
+<p class="output">Actual output:</p>
+<canvas id="c" class="output" width="100" height="50"><p class="fallback">FAIL (fallback content)</p></canvas>
+
+<ul id="d"></ul>
+<script>
+var t = async_test("roundRect() throws or does not throw errors given the strange inputs.");
+_addTest(function(canvas, ctx) {
+
+  ctx.roundRect(0, 0, 100, 100, { foo: "bar" });  //=> DOMPointInit
+  ctx.roundRect(0, 0, 100, 100, undefined);       //=> "missing" -> 0
+  ctx.roundRect(0, 0, 100, 100, [[]]);            //=> « DOMPointInit »
+  ctx.roundRect(0, 0, 100, 100, [[25]]);          //=> « DOMPointInit »
+  ctx.roundRect(0, 0, 100, 100, [undefined]);     //=> « DOMPointInit »
+  assert_throws_js(TypeError, function() { ctx.roundRect(0, 0, 100, 100, 0n); });
+  assert_throws_js(TypeError, function() { ctx.roundRect(0, 0, 100, 100, { x: 0n }); });
+  assert_throws_js(TypeError, function() { ctx.roundRect(0, 0, 100, 100, [{ x: 0n }]); });
+
+});
+</script>
+