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chromium/third_party/blink/web_tests/dom/domparsing/xmlserializer-attribute-entities.html 

<!DOCTYPE html>
<title>Test that XMLSerializer quotes the attribute characters specified in 'https://dvcs.w3.org/hg/innerhtml/raw-file/tip/index.html#dfn-concept-serialize-xml-attributes', the W3C spec</title>
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<script>
setup({single_test: true});

var attrValue = '< > & " \' \xA0';

// HTML case.
// DOM parsing and serialization defers to the HTML specification: http://www.w3.org/html/wg/drafts/html/master/syntax.html#attribute's-serialized-name
// Steps 1-3 under the "Escaping a string" heading are relevant to attributes.
window.htmlElement = document.createElement('div');
htmlElement.setAttribute('quoteme', attrValue);
assert_equals(htmlElement.outerHTML, "<div quoteme=\"&lt; &gt; &amp; &quot; ' &nbsp;\"></div>");

// XML case.
// DOM parsing and serialization: https://dvcs.w3.org/hg/innerhtml/raw-file/tip/index.html#dfn-concept-serialize-xml-attributes
// Step 2 substep 4 is relevant to attributes.
var xmlDocument = document.implementation.createDocument('http://www.w3.org/1999/xhtml', 'html', null);
window.xmlElement = xmlDocument.createElement('div');
xmlElement.setAttribute('quoteme', attrValue);
assert_equals((new XMLSerializer()).serializeToString(xmlElement), "<div xmlns=\"http://www.w3.org/1999/xhtml\" quoteme=\"&lt; &gt; &amp; &quot; ' \xA0\"></div>");
done();
</script>