chromium/third_party/blink/web_tests/external/wpt/css/css-ruby/ruby-line-breaking-002.html

<!DOCTYPE html>
<html lang="ja">
<meta charset="UTF-8">
<title>Line breaking between ruby and preceeding open bracket</title>
<link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
<link rel="author" title="Mozilla" href="https://www.mozilla.org">
<link rel="help" href="https://drafts.csswg.org/css-ruby-1/#break-between">
<link rel="match" href="ruby-line-breaking-002-ref.html">
<link rel="stylesheet" href="/fonts/ahem.css">
<link rel="stylesheet" href="support/ruby-common.css">
<div style="width: 5em; border: 1px solid silver;">
  の「<ruby style="font-family: Ahem;">X<rt style="font-size: 0;"><div style="width: 21rem"></div></ruby>」
</div>