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<title>Syntax and parsing of unknown pseudo-classes</title>
<style type="text/css"><![CDATA[
p { background: lime; }
p:subject { background: red; } /* this is not valid CSS, and if UAs
implemented the experimental :subject pseudo-class they should have
used the :-vnd-ident syntax. */
]]></style>
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<p>This line should have a green background.</p>
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