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chromium/third_party/blink/web_tests/external/wpt/domparsing/innerhtml-06.html 

<!DOCTYPE html>
<html>
<head>
<title>math in html: innerHTML</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
</head>
<body>
<h1>math in html: innerHTML</h1>
<div id="log"></div>
<div style="display:none">
<div id="d1"><math><mi>x</mi></math></div>
</div>
<script>
test(function() {
  var math = document.getElementById("d1").firstChild;
  assert_equals(math.innerHTML, "<mi>x</mi>");
},"innerHTML defined on math.");
</script>