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<!DOCTYPE html>
<html lang="" >
<head>
<meta charset="utf-8"/>
<title>lang="" vs HTTP</title>
<link rel='author' title='Richard Ishida' href='mailto:ishida@w3.org'>
<link rel='help' href='https://html.spec.whatwg.org/multipage/#the-lang-and-xml:lang-attributes'>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<meta name='flags' content='http dom'>
<style type='text/css'>
#colonlangcontroltest { color: red; font-weight: bold; width: 400px; }
#colonlangcontroltest:lang(xx) { display:none; }
.test div { width: 50px; }
#box:lang(ko) { width: 100px; }
</style>
</head>
<body>
<div class="test"><div id="box"> </div></div>
<p lang='xx' id='colonlangcontroltest'>This test failed because it relies on :lang for results, but :lang is not supported by this browser.</p>
<!--Notes:
This test uses :lang to detect whether the language has been set. If :lang is not supported, a message will appear and the test will fail.
-->
<script>
test(function() {
assert_equals(document.getElementById('colonlangcontroltest').offsetWidth, 0)
assert_equals(document.getElementById('box').offsetWidth, 50);
}, "If the HTTP header contains a language declaration but the html element uses an empty lang value, the UA will not recognize the language declared in the HTTP header.");
</script>
<div id='log'></div>
</body>
</html>
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