chromium/third_party/blink/web_tests/external/wpt/css/css-ruby/ruby-dynamic-insertion-004.html

<!DOCTYPE html>
<meta charset="UTF-8">
<title>Test for dynamic insertion of ruby frames</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/#box-fixup">
<link rel="match" href="ruby-dynamic-insertion-004-ref.html">
<link rel="stylesheet" href="support/ruby-common.css">
<script src="support/ruby-dynamic-insertion.js"></script>
<p>No space should exist between 'a' and 'b':</p>

<!-- insert white space -->
<!--     leading white space -->
<p>a<ruby data-insert="start" data-text=" "><rb></rb></ruby>b</p>
<p>a<rbc data-insert="start" data-text=" "><rb></rb></rbc>b</p>
<p>a<rtc data-insert="start" data-text=" "><rt></rt></rtc>b</p>
<!--     trailing white space -->
<p>a<ruby data-insert="end" data-text=" "><rb></rb></ruby>b</p>
<p>a<rbc data-insert="end" data-text=" "><rb></rb></rbc>b</p>
<p>a<rtc data-insert="end" data-text=" "><rt></rt></rtc>b</p>
<!--     inter-level white space -->
<p>a<rb data-insert="after" data-text=" "></rb><rt></rt>b</p>