css/css-overflow/line-clamp/reference/line-clamp-auto-with-ruby-001-ref.html

<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Reference</title>
<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
<style>
.clamp {
  font: 16px / 32px serif;
  white-space: pre;
  background-color: yellow;
  padding: 0 4px;
}
rt {
  font: 32px / 32px Ahem;
  color: blue;
}
</style>

<div class="clamp">Line 1
Line 2
Line 3
Line 4
<ruby>Line 5<rt>X</ruby>…</div>