w3c validation - Is W3C validator is required? -

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i wonder why techie giants facebook shows many errors when validated in w3c (link)

is w3c required?

w3c validation idea, not "required". "required" possibly mean? call isp, static ip, set server, buy domain, , configure http return want , call html if like.

if you're doing web development , have no reason not pass w3c validation, should. presumably, facebook had reason ignore - either wanted wouldn't pass, or didn't want pay engineers make pass, or engineers responsible incompetent, etc.

it's idea validate ensure you're conforming applicable standards site works in many standards-compliant browsers possible.

you think w3c validation bad? tell browser alert javascript errors, enable javascript debugging, , go favorite sites.


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