chromium/third_party/blink/web_tests/external/wpt/css/css-inline/text-box-trim/text-box-trim-half-leading-block-box-001-ref.html

<!DOCTYPE html>
<title>Untrimmed 3-line Reference</title>
<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />

<style>
.div-parent {
  outline: 1px solid orange;
  font: 20px/1 Ahem;
}
</style>

<div class="div-parent">
  <div>Testline1<br><br><br>Testline2<br><br><br>Testline3</div>
</div>