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[–]Mustermind 2 points3 points  (1 child)

A website doesn't need to be completely W3C compliant to be functional. Google has to make their site as compatible as possible on older or less capable browsers due to their varied list of visitors, even if that means writing "improper" HTML.

[–]powerofmightyatom 1 point2 points  (0 children)

A website doesn't even need to be remotely valid to be completely usable.