"Validating CSS : When ?" --
For me :
a) Whenever something does not behave as anticipated;
b) Before signing anything off as complete.
If it fails at either stage, then ensure that any deviations from the
specification are (a) intentional, (b) essential, and (c) have no
undesirable or unanticipated side-effects, as far as can be reasonably
ascertained.
Exactly the same for HTML, except that there is also a choice of DTD,
so (a) HTML 4.01 Strict (preferred, used unless compliance would be
impossible); (b) HTML 4.01 Transitional (if Strict compliance is
impossible); and finally (c) HTML 5, but ONLY if new elements such as
<audio>, <video> or <canvas> are required.
Philip Taylor
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