<html>
<head>
<meta charset="utf-8">
<title>JS Bin</title>
</head>
<body>
<div class="demo">
<h1>:blank selector test by 一丝</h1>
<p>Firefox support <a href="https://developer.mozilla.org/en-US/docs/Web/CSS/%3A-moz-only-whitespace" target="_blank">:-moz-only-whitespace(:blank)</a> <a href="http://dev.w3.org/csswg/selectors/?c=M%3BO%3DD#the-empty-pseudo" target="_blank">specs</a></p>
<p>The correct result is a border with the same color as the text.</p>
<ul>
<li class="empty">This is an
<span></span>
<span>:empty element</span>
</li>
<li class="blank">This is an
<span> </span>
<span>:blank element</span>
</li>
<li>This is not an
<span> <b></b></span>
<span>:empty or :blank element</span>
</li>
</ul>
</div>
</body>
</html>
Output
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