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chromium/third_party/blink/web_tests/fast/parser/entity-surrogate-pairs.html 

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<title>Surrogate entities</title>
<script>if (window.testRunner) testRunner.dumpAsText();</script>
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<p>This tests parsing of numeric HTML entities that encode surrogates. Firefox allows these.</p>
<p>Should be the same character (DESERET CAPITAL LETTER LONG I), repeated three times:</p>
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<p>&#x10400;&#xD801;&#xDC00;&#55297;&#56320;</p>
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</html>