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Chapter 3. Anatomy of an HTML Document > Well-Formed Documents and XHTML

3.4. Well-Formed Documents and XHTML

XHTML is HTML's prissy cousin. What would pass most beauty contests as a very proper and complete HTML document, done according to the book including end-paragraph tags, would get rejected by the XML judges as a malformed file.

To conform with XML, XHTML insists that documents be "well-formed." Among other things, that means every tag must have an ending tag, even the ones like <br> and <hr> that the HTML standard forbids the use of an end tag. With XHTML, the ending is placed inside the start tag: <br />, for example. Section 16.3.3


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