question about updating .css file

[kateheaven]

On the Upgrading theme help pages, when it says "Create a new ID for the "#admin_menu_anim object" " etc., does this mean create a new code bit like all the others, eg ".thumb_title { font-weight : bold;  font-size: 80%;    padding: 2px; display : block; }"

Why do I need to validate my css files?

[Tranz]

Yes.

You don't have to validate them... no one will arrest you. Validation just increases the likelihood that your site will look okay across different browsers. Non-standard code tends to "break" on different browsers.

[kateheaven]

thanks very much