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    <p>There are <a href="http://validator.w3.org/docs/why.html" rel="nofollow noreferrer">many reasons</a> to use valid markup. My favorite is that it allows you to use validation as a form of regression testing, preventing the markup equivalent of "delta rot" from leading to real rendering problems once the errors reach some critical mass. And really, it's just plain sloppy to allow "lazy" errors like typos and mis-nested/unclosed tags to accumulate. Valid markup is one way to identify <a href="https://stackoverflow.com/questions/3247/identifying-passionate-programmers">passionate programmers</a>.</p> <p>There's also the issue of debugging: valid markup also gives you a stable baseline from which to work on the inevitable cross-browser compatibility woes. No web developer who values his time should begin debugging browser compatibility problems without first ensuring that the markup is at least <em>syntactically</em> valid&mdash;and any other invalid markup should have a good reason for being there.</p> <p>(Incidentally, stackoverflow.com fails both these tests, and suggestions to fix the problems <a href="http://stackoverflow.uservoice.com/pages/general/suggestions/14739" rel="nofollow noreferrer">were</a> <a href="http://stackoverflow.uservoice.com/pages/general/suggestions/14740" rel="nofollow noreferrer">declined</a>.)</p> <p>All of that said, to answer your specific question, it's probably not worthwhile to use one of the XHTML doctypes unless you plan to produce valid (or at <em>least</em> well-formed) markup. XHTML's primary advantages are derived from the fact that XHTML is XML, allowing it to be processed and transformed by tools and technologies that work with XML. If you don't plan to make your XHTML well-formed XML, then there's little point in choosing that doctype. The latest HTML 4 spec will probably do everything you need, and it's much more forgiving.</p>
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    1. USJohn Siracusa
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    1. COAlso, HTML4 (heck, even HTML5) allows you to omit certain elements and still produce valid markup (which is sometimes impossible in XHTML by definition). There's rarely need to use invalid markup (maybe for inclusion of Flash or Java applets in antiquated browsers) anyway. Most oftenly it's sloppiness or lack of cleaning up after HTML generation.
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      1. USAlan Plum
    2. COSign under every word. Very well said.
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