This css page on dewiki https://de.wikipedia.org/w/index.php?title=MediaWiki:Group-editor.css&oldid=161824632 is using a css with "display: table".

The word "table" is not highlighted as all the other words on that page like "block" and "inline". That makes me assume it is invalid, but looking at http://www.w3schools.com/cssref/pr_class_display.asp shows that is valid.

Please update syntax highlight to know about this valid word. Thanks.