Via! (exclamation mark) in the CSS property name

Question

I saw it used once or twice where ! the character is placed in front of the property name. For instance:

 !overflow: hidden; 

(also see here )

Can anyone shed light on what his purpose is?

Answer 1

I can not find any information about this, but this is apparently a hack. At the very least, Chrome will not apply styles in which property names contain exclamation points. I am wondering that, at least for the styles I checked, the same style is applied by a different stylesheet except as correct - so maybe this is just a mistake.