Tim Brown reminds us that:
When it comes to type rendering on the web, there’s not much web designers can do.
He’s talking about literally how well type renders on the screen. There are a handful of properties that have significant effects on it, namely: font-size, color, -webkit-font-smoothing, and rotation. Rotation the one that can have the most detrimental effects:
…non-horizontal type is a veritable rendering wilderness.