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diff --git a/layout/mathml/tests/file_disabled_iframe.html b/layout/mathml/tests/file_disabled_iframe.html
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+++ b/layout/mathml/tests/file_disabled_iframe.html
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+<!doctype html>
+<script>
+window.is = window.parent.is;
+window.SimpleTest = window.parent.SimpleTest;
+</script>
+<div id="testnodes"><span>hi</span> there <!-- mon ami --></div>
+<pre id="test">
+<script>
+ let t = document.getElementById('testnodes');
+ t.innerHTML = null;
+ t.appendChild(document.createElementNS("http://www.w3.org/1998/Math/MathML", "math:math"));
+ t.firstChild.textContent = "<foo>";
+ is(t.innerHTML, "<math:math>&lt;foo&gt;</math:math>");
+
+ t.innerHTML = null;
+ t.appendChild(document.createElementNS("http://www.w3.org/1998/Math/MathML", "math"));
+ is(t.firstChild.namespaceURI, "http://www.w3.org/1998/Math/MathML");
+ t.firstChild.appendChild(document.createElementNS("http://www.w3.org/1998/Math/MathML", "script"));
+ is(t.firstChild.firstChild.namespaceURI, "http://www.w3.org/1998/Math/MathML");
+ t.firstChild.firstChild.textContent = "1&2<3>4\xA0";
+ is(t.innerHTML, '<math><script>1&amp;2&lt;3&gt;4&nbsp;\u003C/script></math>');
+
+ t.innerHTML = null;
+ t.appendChild(document.createElementNS("http://www.w3.org/1998/Math/MathML", "math"));
+ is(t.firstChild.namespaceURI, "http://www.w3.org/1998/Math/MathML");
+ t.firstChild.appendChild(document.createElementNS("http://www.w3.org/1998/Math/MathML", "style"));
+ is(t.firstChild.firstChild.namespaceURI, "http://www.w3.org/1998/Math/MathML");
+ t.firstChild.firstChild.textContent = "1&2<3>4\xA0";
+ is(t.innerHTML, '<math><style>1&amp;2&lt;3&gt;4&nbsp;\u003C/style></math>');
+
+ SimpleTest.finish();
+</script>
+</pre>