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why validate

There are good reasons to create valid html and css. Some of them are listed below.
For more detailed information see the W3C site.

For search engines

Search engines prefer valid html and css. Invalid html could be harder to parse for search engines and negatively affect your ranking.

See Google SEO Test - Google Prefers Valid HTML & CSS

For other browsers

Valid html and css are more likely to work in browsers that you haven't tested. That includes browsers that don't yet exist, like the next version of Firefox or IE.

For speed

Compliant browsers can render xhtml faster than html in quirks mode.

For accessibility

Screen reading software for visually impaired users works better with valid html.

For debugging

Invalid html or css could cause bugs that might not come up in other tests.

Valid feeds

Feeds are a simpler case: feed readers aren't as forgiving as browsers and probably won't read an invalid feed.

What's so special about vldtr? It ...