Now in a 1.1 release, XHTML continues to slim down what most Web developers consider the bloated HTML specification. And by leaving style to CSS, the XHTML specification really becomes a manageable collection of tags.
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The Web is moving to XML, a powerfully enabling technology. Writing well–formed, valid XHTML pages is the easiest way to begin this transition.
According to IBM, a switch to XHTML will improve the speed by which your pages load. Older HTML needs to be checked for unclosed tags, and all the rest. As you might expect, this slows down document parsing, and therefore, delays its browser display. XHTML parsing is faster, and the page displays more quickly (and almost identically across browsers).
XHTML brings uniformity to document structure. The rules of XHTML help restore the structural integrity of documents that was lost during the Web's rapid commercial expansion between 1995 and 2003.
Unlike old–style HTML pages, valid, well–formed XHTML documents can easily be "transported" to wireless devices, and other specialized web environments. Moreover, XHTML’s insistence on clean, rule–based markup helps avoid the kind of errors that can make web pages fail even in traditional browsers like Firefox, Microsoft Internet Explorer, Netscape Navigator, and Opera.
Because they follow strict rules and avoid non–standard markup, well–authored XHTML pages are more accessible than older HTML pages.
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