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diff --git a/dom/security/test/sri/iframe_style_crossdomain.html b/dom/security/test/sri/iframe_style_crossdomain.html
new file mode 100644
index 0000000000..f5eb57cbe7
--- /dev/null
+++ b/dom/security/test/sri/iframe_style_crossdomain.html
@@ -0,0 +1,117 @@
+<!DOCTYPE HTML>
+<!-- Any copyright is dedicated to the Public Domain.
+     http://creativecommons.org/publicdomain/zero/1.0/ -->
+<html>
+<head>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+  <script type="application/javascript">
+    function check_styles() {
+      var redText = document.getElementById('red-text');
+      var greenText = document.getElementById('green-text');
+      var blueText = document.getElementById('blue-text');
+      var redTextColor = window.getComputedStyle(redText).getPropertyValue('color');
+      var greenTextColor = window.getComputedStyle(greenText).getPropertyValue('color');
+      var blueTextColor = window.getComputedStyle(blueText).getPropertyValue('color');
+      ok(redTextColor == 'rgb(255, 0, 0)', "The first part should be red.");
+      ok(greenTextColor == 'rgb(0, 255, 0)', "The second part should be green.");
+      ok(blueTextColor == 'rgb(0, 0, 255)', "The third part should be blue.");
+    }
+
+    SimpleTest.waitForExplicitFinish();
+    window.onload = function() {
+      check_styles();
+      SimpleTest.finish();
+    }
+  </script>
+  <script>
+    function good_correctHashCORSLoaded() {
+      ok(true, "A CORS cross-domain stylesheet with correct hash was correctly loaded.");
+    }
+    function bad_correctHashCORSBlocked() {
+      ok(false, "We should load CORS cross-domain stylesheets with hashes that match!");
+    }
+    function good_correctHashBlocked() {
+      ok(true, "A non-CORS cross-domain stylesheet with correct hash was correctly blocked.");
+    }
+    function bad_correctHashLoaded() {
+      ok(false, "We should block non-CORS cross-domain stylesheets with hashes that match!");
+    }
+
+    function good_incorrectHashBlocked() {
+      ok(true, "A non-CORS cross-domain stylesheet with incorrect hash was correctly blocked.");
+    }
+    function bad_incorrectHashLoaded() {
+      ok(false, "We should load non-CORS cross-domain stylesheets with incorrect hashes!");
+    }
+
+    function bad_correctDataBlocked() {
+      ok(false, "We should not block non-CORS cross-domain stylesheets in data: URI!");
+    }
+    function good_correctDataLoaded() {
+      ok(true, "A non-CORS cross-domain stylesheet with data: URI was correctly loaded.");
+    }
+    function bad_correctDataCORSBlocked() {
+      ok(false, "We should not block CORS stylesheets in data: URI!");
+    }
+    function good_correctDataCORSLoaded() {
+      ok(true, "A CORS stylesheet with data: URI was correctly loaded.");
+    }
+
+    function good_correctHashOpaqueBlocked() {
+      ok(true, "A non-CORS(Opaque) cross-domain stylesheet with correct hash was correctly blocked.");
+    }
+    function bad_correctHashOpaqueLoaded() {
+      ok(false, "We should not load non-CORS(Opaque) cross-domain stylesheets with correct hashes!");
+    }
+  </script>
+
+  <!-- valid CORS sha256 hash -->
+  <link rel="stylesheet" href="http://example.com/tests/dom/security/test/sri/style1.css"
+        crossorigin="anonymous"
+        integrity="sha256-qs8lnkunWoVldk5d5E+652yth4VTSHohlBKQvvgGwa8="
+        onerror="bad_correctHashCORSBlocked()"
+        onload="good_correctHashCORSLoaded()">
+
+  <!-- valid non-CORS sha256 hash -->
+  <link rel="stylesheet" href="style_301.css"
+        integrity="sha256-qs8lnkunWoVldk5d5E+652yth4VTSHohlBKQvvgGwa8="
+        onerror="good_correctHashBlocked()"
+        onload="bad_correctHashLoaded()">
+
+  <!-- invalid non-CORS sha256 hash -->
+  <link rel="stylesheet" href="style_301.css?again"
+        integrity="sha256-bogus"
+        onerror="good_incorrectHashBlocked()"
+        onload="bad_incorrectHashLoaded()">
+
+  <!-- valid non-CORS sha256 hash in a data: URL -->
+  <link rel="stylesheet" href="data:text/css,.green-text{color:rgb(0, 255, 0)}"
+        integrity="sha256-EhVtGGyovvffvYdhyqJxUJ/ekam7zlxxo46iM13cwP0="
+        onerror="bad_correctDataBlocked()"
+        onload="good_correctDataLoaded()">
+
+  <!-- valid CORS sha256 hash in a data: URL -->
+  <link rel="stylesheet" href="data:text/css,.blue-text{color:rgb(0, 0, 255)}"
+        crossorigin="anonymous"
+        integrity="sha256-m0Fs2hNSyPOn1030Dp+c8pJFHNmwpeTbB+8J/DcqLss="
+        onerror="bad_correctDataCORSBlocked()"
+        onload="good_correctDataCORSLoaded()">
+
+  <!-- valid non-CORS sha256 hash -->
+  <link rel="stylesheet" href="http://example.com/tests/dom/security/test/sri/style1.css"
+        integrity="sha256-qs8lnkunWoVldk5d5E+652yth4VTSHohlBKQvvgGwa8="
+        onerror="good_correctHashOpaqueBlocked()"
+        onload="bad_correctHashOpaqueLoaded()">
+</head>
+<body>
+<p><span id="red-text">This should be red</span> but
+  <span id="green-text" class="green-text">this should be green</span> and
+  <span id="blue-text" class="blue-text">this should be blue</span></p>
+<p id="display"></p>
+<div id="content" style="display: none">
+</div>
+<pre id="test">
+</pre>
+</body>
+</html>