What is the "W3C Markup Validator" button for on websites used for?

Posted by Tom on Stack Overflow See other posts from Stack Overflow or by Tom
Published on 2010-05-28T22:27:33Z Indexed on 2010/05/28 22:32 UTC
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w3c-validation

May websites, including professional ones usually have a "W3C Markup Validator" and "W3C CSS Validator." Why do you put them there? Is it just pride or is it justified? If it is more than pride, what justifies them?

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