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Valid HTML/XHTML ensures that future versions of browsers will support the markup, and that current versions of browsers will support the markup in a standard way. There are many examples of browsers interpreting HTML according to their own quirks, so that web pages look different and wonky in different browsers. To make sure a web page looks and acts the same way across browsers, you use valid HTML/XHTML and a DTD (document type definition) that forces the browser to use standard interpration.
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