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chromium/third_party/blink/web_tests/external/wpt/css/css-overflow/overflow-ellipsis-dynamic-001.html 

<!doctype html>
<html class="reftest-wait">
<title>CSS Overflow Test: text-overflow: ellipsis after dynamic test change</title>
<link rel="help" href="https://drafts.csswg.org/css-overflow-3/#text-overflow">
<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1615811">
<link rel="author" href="mailto:[email protected]" name="Emilio Cobos Álvarez">
<link rel="author" href="https://mozilla.org" name="Mozilla">
<link rel="match" href="reference/overflow-ellipsis-dynamic-001-ref.html">
<style>
p {
  width: 40ch;
  font: 16px/1 monospace;
  text-overflow: ellipsis;
  white-space: nowrap;
  overflow: hidden;
}
</style>
<p>longtext longtext longtext longtext longtext longtext longtext longtext</p>
<script>
onload = function() {
  requestAnimationFrame(() => requestAnimationFrame(() => {
    document.querySelector("p").firstChild.nodeValue = "short";
    document.documentElement.className = "";
  }));
}
</script>