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chromium/third_party/blink/web_tests/fast/parser/hex-entities-length.html 

<head>
<title>Hex HTML entities of various lengths</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<script>
if (window.testRunner)
    testRunner.dumpAsText();
</script>
</head>
<body>
<p>There should be 6 lines below, each with two copies of the same character.</p>
<ol>
<li>a&#x61;</li>
<li>ḁ&#x1e01;</li>
<li>𐐀&#x10400;</li>
<li>𐑍&#x01044D;</li>
<li>𐑎&#x001044e;</li>
<li>𐑏&#x0001044f;</li>
</ol>
</body>