overflow - Css element Max-Size -

what major differences in using these css rules

div{width:100px; overflow:hidden;}

and

div{max-width:100px; overflow:hidden!important;}

is there going cross-compatibility issues.

max-width great stating "don't go bigger this, it's ok if it's smaller".

this might great if doing speech bubble dynamic in size (depending on content) , wanted div surrounding speech bubble vary.

width on other hand says "the must 100px", means if content within div smaller, surrounding div still 100px.

UV code