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Unlike HTML, XML does not define presentation attributes such as </font>. An XML document designer is free to define and use such tags, but they do not currently have a generally understood meaning.
Various initiatives have begun to define a standard for combining XML and HTML in the same document. Industry groups are working on a definition for an HTML DTD (that is, a standard DTD for the most commonly used HTML tags). The more modern browsers have some built-in ability to render XML documents in a suitable manner for end users, with some default formatting conventions.
Microsoft and others have proposed standards for combining HTML and XML in the same document. Two initiatives are the furthest along in their development: cascading style sheets (CSS), a simple syntax that allows style sheets to be associated with elements, and extensible style language (XSL), an XML document type with bits of formatting commands borrowed from HTML and other sources.
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