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chromium/third_party/blink/web_tests/external/wpt/css/css-ruby/line-break-around-ruby-001.html 

<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Ruby Test: Test line breaking before and after &lt;ruby&gt; elements.</title>
<link rel="help" href="https://drafts.csswg.org/css-ruby-1/#ruby-layout">
<meta name="assert" content="est line breaking before and after &lt;ruby&gt; elements">
<meta name="flags" content="dom">
<link rel="author" title="Koji Ishii" href="mailto:[email protected]">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
#container > div {
    line-height:2;
    margin-bottom:1em;
}
</style>
<div id="log"></div>
<div id="container">
    <div title="OP+ID" style="width:2em;">あ（かき</div>
    <div title="ID+CL" style="width:2em;">あい）か</div>
    <div title="span+CL" style="width:2em;">あ<span>す</span>）か</div>
    <div title="OP+ruby" style="width:2em;">あ（<ruby>べ<rt>る</rt></ruby>か</div>
    <div title="ruby+CL" style="width:2em;">あ<ruby>べ<rt>る</rt></ruby>）か</div>
    <div title="OP+ruby+CL" style="width:3em;">あ（<ruby>べ<rt>る</rt></ruby>）か</div>
</div>
<script>
runTests();
function runTests() {
    var lineHeight = parseFloat(getComputedStyle(container.firstElementChild).lineHeight);
    Array.prototype.forEach.call(container.children, function (element) {
        test(function () {
            var lineCount = element.offsetHeight / lineHeight;
            assert_approx_equals(lineCount, 3, 0.1);
        }, element.title);
    });
}
</script>