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chromium/content/test/data/accessibility/css/before-after-block.html 

<!--
@BLINK-ALLOW:htmlTag*
-->
<html>
<head><style>
  b::before, i::after {
    content: "";
    display: block;
  }
</style></head>
<body><div>A <b>bold</b> element</div></body>
</html>