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chromium/third_party/blink/web_tests/fast/ruby/text-align-justify.html 

<!DOCTYPE html>
<meta charset="utf-8">
<title>A pixel test for ruby behavior in a line with text-align:justify</title>
<style>
div {
  text-align: justify;
  text-align-last: justify;
  font-size: 24px;
  width: 10.99em;
  padding: 2px;
  border: 2px solid gray;
  margin-bottom: 8px;
}
ruby {
  color: blue;
}
rt {
  color: orange;
}
span {
  display: inline-block;
  width: 1em;
  height: 1em;
  background-color: blue;
}
</style>

<!-- longer base -->
<div>
〓〓〓〓〓〓〓〓〓〓
<ruby>〓〓〓〓<rt>〓〓〓</ruby>〓<br>
<ruby>〓〓〓<span></span><rt>〓〓〓</ruby>〓<br>
<ruby>〓〓<ruby>〓〓<rt>〓〓</rt></ruby><rt>〓〓〓</ruby>〓<br>
<ruby>〓〓〓〓<rt>〓〓〓</ruby>
</div>

<!-- shorter base -->
<div>
〓〓〓〓〓〓〓〓〓〓
<ruby>〓〓〓<rt>〓〓〓〓〓〓〓〓〓</ruby>〓<br>
<ruby>〓〓<span></span><rt>〓〓〓〓〓〓〓〓〓</ruby>〓<br>
<ruby>〓〓〓<rt>〓〓〓〓〓〓〓〓〓</ruby>
</div>