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Really handy tip from usabilitypost about fixing a Mac's default blue glow around focused text inputs:

Ouch. A big blue glow effect right around the “real” input area. This clashes badly with the image the designer wants to use for the field. Thankfully there is an easy CSS fix for this. All you need to do is set the outline property to none for when this field is in focus. The code looks like this:

input:focus { outline: none; }

Once you do that, the blue glow in OS X will be gone:

Certainly a handy tip that's not used/known enough. Check out their full post here.