chromium/third_party/blink/web_tests/external/wpt/css/css-overflow/line-clamp/reference/line-clamp-auto-029-ref.html

<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Reference</title>
<style>
.clamp {
  display: flow-root;
  font: 16px / 32px serif;
  white-space: pre;
  background-color: yellow;
  margin: 4px;
}
.clamp div {
  margin: 4px;
}
</style>
<div class="clamp"><div><div><div>Line 1
Line 2
Line 3
Line 4…</div></div></div></div>