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chromium/third_party/blink/web_tests/external/wpt/css/css-text/text-autospace/text-autospace-first-line-001.html 

<!DOCTYPE html>
<meta charset="utf-8">
<link rel="help" href="https://drafts.csswg.org/css-text-4/#text-autospace-property">
<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="../support/get-char-advances.js"></script>
<style>
.test {
  font-family: Ahem;
  font-size: 40px;
}
.first-line::first-line {
  font-size: 200%;
}
</style>
<div id="container">
  <div id="test1" class="test first-line">国国XX国<br>国国XX国</div>
</div>
<script>
test(() => {
  const advances = getCharAdvances(test1);
  assert_array_equals(advances, [80, 90, 80, 90, 80, 40, 45, 40, 45, 40]);
})
</script>