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diff --git a/testing/web-platform/tests/html/canvas/element/path-objects/2d.path.roundrect.3.radii.1.dompoint.html b/testing/web-platform/tests/html/canvas/element/path-objects/2d.path.roundrect.3.radii.1.dompoint.html
new file mode 100644
index 0000000000..f4fa76afac
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/element/path-objects/2d.path.roundrect.3.radii.1.dompoint.html
@@ -0,0 +1,41 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>Canvas test: 2d.path.roundrect.3.radii.1.dompoint</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.3.radii.1.dompoint</h1>
+<p class="desc">Verify that when three radii are given to roundRect(), the first radius, specified as a DOMPoint, applies to the top-left corner.</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("Verify that when three radii are given to roundRect(), the first radius, specified as a DOMPoint, applies to the top-left corner.");
+_addTest(function(canvas, ctx) {
+
+  ctx.fillStyle = '#f00';
+  ctx.fillRect(0, 0, 100, 50);
+  ctx.roundRect(0, 0, 100, 50, [new DOMPoint(40, 20), 0, 0]);
+  ctx.fillStyle = '#0f0';
+  ctx.fill();
+
+  // top-left corner
+  _assertPixel(canvas, 20,1, 255,0,0,255);
+  _assertPixel(canvas, 41,1, 0,255,0,255);
+  _assertPixel(canvas, 1,10, 255,0,0,255);
+  _assertPixel(canvas, 1,21, 0,255,0,255);
+
+  // other corners
+  _assertPixel(canvas, 98,1, 0,255,0,255);
+  _assertPixel(canvas, 98,48, 0,255,0,255);
+  _assertPixel(canvas, 1,48, 0,255,0,255);
+
+});
+</script>
+