CSS2.1 validation fails for font-weight

Question

In the CSS2.1 standard, I see that font-weight exists:

http://www.w3.org/TR/CSS21/fonts.html#font-boldness

But I get the following errors while validating:

50   h2  Value Error : font-weight 600 is not a font-weight value : 600
53   h5  Value Error : font-weight 900 is not a font-weight value : 900
95   div#logo    Value Error : font-weight 600 is not a font-weight value : 600
470  .contactInfoLink a  Value Error : font-weight 800 is not a font-weight value : 800

Why?

Answer 1

Ignore it. It's a valid value. There is probably a bug in the CSS validation software somewhere. The most notable one I've received: Parse Error [empty string]. Isn't that just a lovely and detailed error? Anyways, these errors sprout up on occasion. There's not really anything we can do about them.

Answer 2

It is apparently a bug the the W3C CSS Validator, probably rather recent. It seems to report all numeric values for font-weight as errors. I have filed a bug report: http://lists.w3.org/Archives/Public/www-validator-css/2012Mar/0015.html

Answer 3

I am experiencing the same problem as well; a google of the error I was receiving brought me to this question. I happen to be experiencing not only Parse Error [empty string], but also the font-weight issue, and also a validator issue with word-wrap that says break-word doesn't exist.

The break-word bug is confirmed here. It sounds like the bug is quite old.