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diff --git a/testing/web-platform/tests/css/css-fonts/test_datafont_same_origin.html b/testing/web-platform/tests/css/css-fonts/test_datafont_same_origin.html
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+++ b/testing/web-platform/tests/css/css-fonts/test_datafont_same_origin.html
@@ -0,0 +1,43 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset=utf-8>
+  <title>data:font same-origin test</title>
+  <link rel="author" title="Henry Chang" href="mailto:hchang@mozilla.com">
+  <link rel="help" href="http://www.w3.org/TR/css-fonts-3/#font-prop" />
+  <meta name="assert" content="tests data:font would be treated same origin." />
+  <script type="text/javascript" src="/resources/testharness.js"></script>
+  <script type="text/javascript" src="/resources/testharnessreport.js"></script>
+  <style type="text/css">
+    @font-face {
+      font-family: 'DataFont';
+      src: url(data:font/opentype;base64,AAEAAAANAIAAAwBQRkZUTU6u6MkAAAXcAAAAHE9TLzJWYWQKAAABWAAAAFZjbWFwAA8D7wAAAcAAAAFCY3Z0IAAhAnkAAAMEAAAABGdhc3D//wADAAAF1AAAAAhnbHlmCC6aTwAAAxQAAACMaGVhZO8ooBcAAADcAAAANmhoZWEIkAV9AAABFAAAACRobXR4EZQAhQAAAbAAAAAQbG9jYQBwAFQAAAMIAAAACm1heHAASQA9AAABOAAAACBuYW1lehAVOgAAA6AAAAIHcG9zdP+uADUAAAWoAAAAKgABAAAAAQAAMhPyuV8PPPUACwPoAAAAAMU4Lm0AAAAAxTgubQAh/5wFeAK8AAAACAACAAAAAAAAAAEAAAK8/5wAWgXcAAAAAAV4AAEAAAAAAAAAAAAAAAAAAAAEAAEAAAAEAAwAAwAAAAAAAgAAAAEAAQAAAEAALgAAAAAAAQXcAfQABQAAAooCvAAAAIwCigK8AAAB4AAxAQIAAAIABgkAAAAAAAAAAAABAAAAAAAAAAAAAAAAUGZFZABAAEEAQQMg/zgAWgK8AGQAAAABAAAAAAAABdwAIQAAAAAF3AAABdwAZAAAAAMAAAADAAAAHAABAAAAAAA8AAMAAQAAABwABAAgAAAABAAEAAEAAABB//8AAABB////wgABAAAAAAAAAQYAAAEAAAAAAAAAAQIAAAACAAAAAAAAAAAAAAAAAAAAAQAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAwAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAhAnkAAAAqACoAKgBGAAAAAgAhAAABKgKaAAMABwAusQEALzyyBwQA7TKxBgXcPLIDAgDtMgCxAwAvPLIFBADtMrIHBgH8PLIBAgDtMjMRIREnMxEjIQEJ6MfHApr9ZiECWAAAAwBk/5wFeAK8AAMABwALAAABNSEVATUhFQE1IRUB9AH0/UQDhPu0BRQB9MjI/tTIyP7UyMgAAAAAAA4ArgABAAAAAAAAACYATgABAAAAAAABAAUAgQABAAAAAAACAAYAlQABAAAAAAADACEA4AABAAAAAAAEAAUBDgABAAAAAAAFABABNgABAAAAAAAGAAUBUwADAAEECQAAAEwAAAADAAEECQABAAoAdQADAAEECQACAAwAhwADAAEECQADAEIAnAADAAEECQAEAAoBAgADAAEECQAFACABFAADAAEECQAGAAoBRwBDAG8AcAB5AHIAaQBnAGgAdAAgACgAYwApACAAMgAwADAAOAAgAE0AbwB6AGkAbABsAGEAIABDAG8AcgBwAG8AcgBhAHQAaQBvAG4AAENvcHlyaWdodCAoYykgMjAwOCBNb3ppbGxhIENvcnBvcmF0aW9uAABNAGEAcgBrAEEAAE1hcmtBAABNAGUAZABpAHUAbQAATWVkaXVtAABGAG8AbgB0AEYAbwByAGcAZQAgADIALgAwACAAOgAgAE0AYQByAGsAQQAgADoAIAA1AC0AMQAxAC0AMgAwADAAOAAARm9udEZvcmdlIDIuMCA6IE1hcmtBIDogNS0xMS0yMDA4AABNAGEAcgBrAEEAAE1hcmtBAABWAGUAcgBzAGkAbwBuACAAMAAwADEALgAwADAAMAAgAABWZXJzaW9uIDAwMS4wMDAgAABNAGEAcgBrAEEAAE1hcmtBAAAAAgAAAAAAAP+DADIAAAABAAAAAAAAAAAAAAAAAAAAAAAEAAAAAQACACQAAAAAAAH//wACAAAAAQAAAADEPovuAAAAAMU4Lm0AAAAAxTgubQ==);
+    }
+  </style>
+</head>
+<body>
+<div id="log"></div>
+<pre id="display"></pre>
+<style type="text/css" id="testbox"></style>
+
+<script type="text/javascript">
+  async_test(function(t) {
+    var text = document.createElement('p');
+    // Cross-domain font will not load according to [1] so we try to apply
+    // data:font to this text and see if the font can be loaded.
+    // [1] https://www.w3.org/TR/css-fonts-3/#same-origin-restriction
+    text.style = 'font-family: DataFont';
+    text.innerHTML = "This text should trigger 'TestFont' to load.";
+    document.body.appendChild(text);
+
+    document.fonts.onloadingdone = function (fontFaceSetEvent) {
+      assert_equals(fontFaceSetEvent.fontfaces.length, 1, "Same origin font should be loaded.");
+      t.done();
+    };
+    document.fonts.onloadingerror = function (fontFaceSetEvent) {
+      assert_unreached("data:font is not same origin!");
+    };
+  }, "Test if data:font would be treated same origin.")
+</script>
+</body>
+</html>