hi there,
i know how your example works.
all i been thru for my website design, the following are used by me.
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.u { text-decoration: underline }
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h1.u { font-weight: bold }
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h1#x { font-weight: normal }
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#x { text-decoration: underline }
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others i never use before.
As the question i ask about
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. { text-decoration: underline }
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this happens in my exam question. And i dont know how to answer that, i just say, any html element can use it in a document.
haha.
thanks for the help.