Posted by Travis Newbury on 10/13/28 11:37

Nowhere wrote:
> What is it? Why do you need it? Thanks.

It is a way to check that you are using HTML and CSS "standards"

You don't "NEED" it. It is a nice to have, but there is no requirement
to have it. Your website and be non valid and still work perfectly
fine in all browsers. Some people are a little anal about it. Most
(personal observation) seem to use it as a tool not a goal. It may
help you when things are not displaying as you would like them to.

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