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chromium/third_party/blink/web_tests/external/wpt/css/css-text/line-breaking/line-breaking-029.html 

<!doctype html>
<html>
<meta charset="utf-8">
<title>CSS Text — line breaking around Break After and Exclamation</title>
<meta name=assert content="When ‘white-space’ allows wrapping, line breaking behavior defined for IS and QU line-breaking classes in [UAX14] must be honored.">
<link rel=help href="https://www.w3.org/TR/css-text-3/#line-breaking">
<link rel=help href="https://bugzilla.mozilla.org/show_bug.cgi?id=1880362">
<link rel=author title="Makoto Kato" href="mailto:[email protected]">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
.test > div {
  font-family: monospace;
  font-size: 25px;
  width: 1ch;
  line-height: 30px;
}
</style>
<body>

<div class="test">
  <div id="nonbreakable1">1.&#x201D;</div>
  <div id="nonbreakable2">a.&#x201D;</div>
  <div id="nonbreakable3">1.&#x0022;</div>
  <div id="nonbreakable4">a.&#x0022;</div>
</div>

<script>
test(function() {
  assert_true(document.getElementById('nonbreakable1').offsetHeight <= 35);
}, "U+0x0031 (NU), U+0x002E (IS) and U+0x201D (QU)");
test(function() {
  assert_true(document.getElementById('nonbreakable2').offsetHeight <= 35);
}, "U+0x0041 (AL), U+0x002E (IS) and U+0x201D (QU)");
test(function() {
  assert_true(document.getElementById('nonbreakable3').offsetHeight <= 35);
}, "U+0x0031 (NU), U+0x002E (IS) and U+0x0022 (QU)");
test(function() {
  assert_true(document.getElementById('nonbreakable4').offsetHeight <= 35);
}, "U+0x0041 (AL), U+0x002E (IS) and U+0x0022 (QU)");
</script>

<div id='log'></div>

</body>
</html>