chromium/third_party/blink/web_tests/fast/ruby/line-break-ruby.html

<!DOCTYPE html>
<meta charset="utf-8">
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<style>
#container > div {
    line-height:2;
    margin-bottom:1em;
    font-family: "Kochi Mincho", "Heiti SC", "MS Mincho", serif;
}
</style>
<div id="container">
    <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="ruby+CL" style="width:2em;">あ<ruby>べ<rt>る</rt></ruby>)か</div>
    <div title="OP+ID" style="width:2em;">あ(かき</div>
    <div title="OP+ruby" 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 title="OP+ruby+CL (overflow)" style="width:2em;">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_equals(lineCount, 3);
        }, element.title);
    });

    if (window.testRunner)
        container.style.display = "none";
}
</script>