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chromium/third_party/blink/web_tests/external/wpt/css/css-text/text-spacing-trim/text-spacing-trim-dynamic-001.html 

<!DOCTYPE html>
<meta charset="utf-8">
<link rel="help" href="https://drafts.csswg.org/css-text-4/#text-spacing-trim-property">
<link rel="match" href="text-spacing-trim-space-all-001-ref.html">
<meta name="variant" content="?class=halt">
<meta name="variant" content="?class=chws">
<script src="support/variant-class.js"></script>
<style>
@font-face {
  font-family: halt-font;
  src: url('/fonts/noto/cjk/NotoSansCJKjp-Regular-subset-halt.otf');
}
@font-face {
  font-family: chws-font;
  src: url('/fonts/noto/cjk/NotoSansCJKjp-Regular-subset-chws.otf');
}
#container {
  font-family: halt-font;
  font-size: 20px;
  width: 4em;
}
.chws #container {
  font-family: chws-font;
}
#container > div > span {
  background: black;
}
.off {
  text-spacing-trim: space-all;
}
</style>
<div id="container">
  <div><span>国）（国国（（国（国</span></div>
</div>
<script>
document.fonts.ready.then(() => {
  document.body.offsetTop;
  const container = document.getElementById('container');
  container.classList.add('off');
});
</script>