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Test Info:

<!DOCTYPE html>
<html lang="en" >
<head>
<meta charset="utf-8"/>
<title>[lang="az-Arab-IR"], lang="az-Arab-IR"</title>
<link rel='author' title='Richard Ishida' href='mailto:ishida@w3.org'>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style type='text/css'>
.test div { width: 50px; }
#box[lang='az-Arab-IR'] { width: 100px; }
</style>
</head>
<body>
<div class="test"><div id="box" lang="az-Arab-IR">&#xA0;</div></div>
<script>
test(function() {
assert_equals(document.getElementById('box').offsetWidth, 100);
}, "A lang= value with language, script and region subtags will match a lang attribute value with the same language, script and region subtags.");
</script>
<div id='log'></div>
</body>
</html>