ruby-intra-level-whitespace-001-ref.html

<!DOCTYPE html>
<meta charset="UTF-8">
<title>Intra-level whitespace pairing</title>
<link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
<link rel="author" title="Mozilla" href="https://www.mozilla.org">
<link rel="stylesheet" href="support/ruby-common.css">
<p><ruby>
  <rb>a</rb><rb pseudo><span> </span></rb><rb>b</rb>
  <rt>x</rt><rt pseudo><span> </span></rt><rt>y</rt>
</ruby></p>
<p><ruby>
  <rb>a</rb><rb pseudo><span> </span></rb><rb>b</rb>
  <rt>x</rt><rt></rt><rt>y</rt>
</ruby></p>
<p><ruby>
  <rb>a</rb><rb pseudo></rb><rb>b</rb>
  <rt>x</rt><rt pseudo><span> </span></rt><rt>y</rt>
</ruby></p>

chromium/third_party/blink/web_tests/external/wpt/css/css-ruby/ruby-intra-level-whitespace-001-ref.html