CSS properties that affect type rendering « The Typekit Blog
►http://blog.typekit.com/2011/01/26/css-properties-that-affect-type-rendering
So: as a web designer, font rendering is mostly out of your hands. But it’s important to remember that certain styles within your control can have an effect. When testing, keep in mind that different styles for contrast, size, color, and rotation can result in significant differences.