What’s the point of valid CSS/HTML?

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  • Google prefers it so it is good for SEO.
  • It makes your web page more likely to work in browsers you haven’t tested.
  • It allows you to generate or use your page as an XML document.
  • It makes you look more professional (to some developers at least)
  • Compliant browsers can render XHTML faster than HTML in quirks mode.
  • It points out a bunch of obscure bugs you’ve probably missed that affect things you probably haven’t tested e.g. the codepage or language set of the page.

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