XHTML
Many tools of the new Web, as well as many other websites on today’s Internet, rely on another development that is quite technical for the purposes of this chapter but is nevertheless worth mentioning. The XHTML standard is an effort to bridge between old-fashioned HTML and the realities of the XML-based web environment. XHTML is essentially a formulation of HTML functionality that conforms to XML syntax. The XHTML format provides all the expressive power of HTML within the machine-readable confines of an XML schema.
Although the concepts of XHTML are similar to HTML, XHTML is much more finicky about sloppy or nonstandard coding practice. Certain declarations occur differently, or more formally, and the nesting of tags must be more structured ...
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