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chromium/third_party/blink/web_tests/fast/deprecated-flexbox/dynamically-change-line-clamp.html 

<!DOCTYPE html>
<script src="../../resources/ahem.js"></script>
<p>There should only be two lines below as the third line is hidden via -webkit-line-clamp.</p>
<div style="font: 20px/1 Ahem; display: -webkit-box; -webkit-box-orient: vertical; overflow: hidden" id="webkitbox">
    xxx<br>
    xxx<br>
    xxx<br>
</div>
<script>
  var webkitbox = document.getElementById("webkitbox");
  // Referencing |offsetWidth| ensures a layout happens before changing the
  // line-clamp. This is done to ensure toggling line-clamp works.
  webkitbox.offsetWidth;
  webkitbox.style.webkitLineClamp = 2;
</script>