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chromium/third_party/blink/web_tests/virtual/text-antialias/forced-break-before-close-tag.html 

<!DOCTYPE html>
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<style>
#container > * {
  font-size: 20px;
  line-height: 1;
  border: 1px solid blue;
  margin: 0;
}
.margin-right {
  margin-right: 1em;
}
.border-right {
  border-right: 1em solid purple;
}
.padding-right {
  padding-right: 1em;
}
</style>
<body>
<div id="log"></div>
<div id="container">
<pre><span class="margin-right">First line
</span></pre>

<pre><span class="border-right">First line
</span></pre>

<pre><span class="padding-right">First line
</span></pre>

<pre><span class="border-right"><span class="border-right">First line
</span></span></pre>

<div><span class="margin-right">First line<br>
</span></div>

<div><span class="border-right">First line<br>
</span></div>

<div><span class="padding-right">First line<br>
</span></div>

<div><span class="border-right"><span class="border-right">First line<br>
</span></span></div>
</div>
<script>
for (let e of container.children) {
  test(() => {
    assert_approx_equals(e.offsetHeight, 20, 2);
  }, e.innerHTML);
}
</script>
</body>