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Why we should make our web page valid?
Validating Web documents is an important step which can dramatically help improving and ensuring their quality, and it can save a lot of time and money. Validation is, however, neither a full quality check, nor is it strictly equivalent to checking for conformance to the specification.
How to validate them?
I’ve just known lately that it’s really sick to make your page site valid. W3’s site gives us the simple way to validate our page either it’s been posted to the server or it’s only a file html, xhtml, css, php on your computer. Go to these page :
I think it’s cool to show off your web page with this picture: