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diff --git a/layout/style/test/test_mask_image_CORS.html b/layout/style/test/test_mask_image_CORS.html
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index 0000000000..8edd8af48e
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+++ b/layout/style/test/test_mask_image_CORS.html
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+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>Test mask-image CORS anonymous retrieval</title>
+<link rel="stylesheet" href="/tests/SimpleTest/test.css">
+<script src="/tests/SimpleTest/SimpleTest.js"></script>
+<script src="/tests/SimpleTest/WindowSnapshot.js"></script>
+<style>
+.block100 {
+  width: 100px;
+  height: 100px;
+}
+#allow {
+  /*
+   * shape-outside is unnecessary for the mask, but using it ensures that the first frame
+   * of the image is decoded and reflow is called before onload is fired. Since the
+   * shape-outside uses the same url as the mask, this ensures that the css image resource
+   * is decoded and available for the repaint triggered by the call to snapshotRect.
+   */
+  shape-outside: url("support/blue-100x100.png");
+  mask-image: url("support/blue-100x100.png");
+  background-color: #00FF00
+}
+#refuse {
+  shape-outside: url("http://example.com/tests/layout/style/test/support/blue-100x100.png");
+  mask-image: url("http://example.com/tests/layout/style/test/support/blue-100x100.png");
+  background-color: #FF0000
+}
+</style>
+
+<script>
+SimpleTest.waitForExplicitFinish();
+
+function checkBothSquares() {
+  checkIsColor("allow", "0,255,0,255");
+  checkIsColor("refuse", "255,255,255,255");
+
+  SimpleTest.finish();
+}
+
+function checkIsColor(elementId, color) {
+  let e = document.getElementById(elementId);
+  let r = e.getBoundingClientRect();
+  info("Element " + elementId + " has rect " + r.top + ", " + r.left + ", " + r.width + ", " + r.height + ".");
+
+  let canvas = snapshotRect(window, r);
+  let context = canvas.getContext('2d');
+
+  // Only check the top left pixel.
+  let image = context.getImageData(0, 0, 1, 1);
+  let pixel = image.data.toString();
+  is(pixel, color, "Element " + elementId + " has expected color.");
+}
+</script>
+
+</head>
+<body onload="checkBothSquares()">
+  <p>There should be a green square, but no red square.</p>
+  <div id="allow" class="block100"></div>
+  <div id="refuse" class="block100"></div>
+</body>
+</html>