I.E. HTML Colors

I found out today that Firefox, Chrome, Opera, and Safari ( 3.0.3, 2.0.175, 9.63, 3.2.2) will accept the html shortcut for #808080 as 'grey', but I.E. 7.0.5 won't. I.E. will take 'gray'. I will resort to using the hex code from now on.