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<!DOCTYPE html>
<meta charset="UTF-8">
<title>CSS Reference File</title>
<link rel="author" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/">
<style>
ruby
{
background-color: lightblue;
font-size: 40px;
}
</style>
<ruby><rbc>B<ruby>​<rt>A</rt></ruby></rbc></ruby>
<!--
​ or ​ is the entity reference for zero-wide space.
MathML uses the entity name ​ for this character.
-->