Hiding an element that contains only spaces using CSS

Question

I am trying to hide the following element in an automatically generated HTML document:

Answer 1

Answer: Not yet, but it's drafted.

https://drafts.csswg.org/selectors-4/#the-blank-pseudo

...and —at least for Mozilla— there's already a prefixed implementation... :-moz-only-whitespace:

http://jsfiddle.net/peayLrv3/