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HTML tutorial, understanding the optgroup element_HTML/Xhtml_Web page production

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WBOYOriginal
2016-05-16 16:45:031223browse

Category selection of select. After testing, both IE and FF can support this element well.

!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">


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