Remove iPad anchor outline

Really, that simple. I have anchors set without outline, a la: a {outline:none}

Is there some开发者_开发问答thing else? Check out the screenshot below

http://cl.ly/0s1C2g1V0v0W2C351M1P

Thank you!

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It's not an outline but a specific iPad (and iPhone?) rule : http://css-infos.net/property/-webkit-tap-highlight-color