Does anybody know how to stop Opera Mobile (Windows emulator) from displaying bluish outlines for touched HTML elements?
Blue outline appears when touched:

I want this:

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Probably not the answer you want to hear, but at present it is not possible to disable or override the blue highlight. As Tony318 says, this is by design to enable users to see immediately which link they’ve pressed (especially important with small buttons/links close together). Being able to override the outline has been logged as a feature request, however, so this behaviour may change in the future.
Incidentally, here’s a good general resource for disabling outlines, although it doesn’t apply to Opera Mobile in this case: http://people.opera.com/patrickl/experiments/keyboard/test