There's a lot of good reasons to write valid XHTML (even if the vast majority of sites don't bother): Your site will render better, faster and more consistently across all browsers.Your layout will be pushed from tables and tags to CSS, separating data from presentation and reducing maintenance costs.Computers (most notably, search engines) will be able to parse and make sense of your content easier than they might otherwise have been able to.You're supporting standards compliance (which transla