Now for some snippets! Basically, just code that might be handy on a cheat sheet. Nothing complicated.
This one will enable proper CSS opacity across all browsers (albeit with some caveats in Internet Explorer, which will behave slightly differently at times):
selector { filter: alpha(opacity = 50); /* IE 5.5+ */ -ms-filter: alpha(opacity = 50); /* Overrides the previous in IE 8 */ opacity: .5; /* Overrides both of the previous in IE 9, works for all other browsers. */ }