CSS validator

[pehser]

http://jigsaw.w3.org/css-validator/validator?uri=https%3A%2F%2Fmaxcdn.bootstrapcdn.com%2Fbootstrap%2F3.3.6%2Fcss%2Fbootstrap.min.css&profile=css3&usermedium=all&warning=1&vextwarning=&lang=en

big error - 32

[patrickhlauke]

the various "\9" errors are due to a the CSS hack used for old versions of IE - so these are intentional errors (which in modern browsers will be skipped, but in old versions of IE will be wrongly parsed, fixing rendering issues).

the error for "DXImageTransform" refers to the fact that it's an old IE proprietary CSS extension.

all other errors simply show that the validator is out of date (e.g. flagging pointer-events:none as being non-existent, when in fact it is).

in short...these are all either intentional errors/hack/proprietary extensions, or things that the validator hasn't caught up with yet.

[cvrebert]

See http://getbootstrap.com/getting-started/#support-validators

[cvrebert]

the various "\9" errors are due to a the CSS hack used for old versions of IE

And we're working on adjusting the validator to consider this a vendor extension warning instead of a syntax error: w3c/css-validator#38