CSS Tip: Cross-Browser Compatibity

HTML_Element {
   Attribute: Value;  /* Works on ALL Browsers */
   #Attribute: Value; /* Works on IE */
   _Attribute: Value; /* Works on IE6 And Older */
Prefix # works on only.
Prefix _ works on 6 and Older.
Before it was used the prefix * that would work only in but it seems to generate invalid DOM exceptions on browsers.