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Most Stack Exchange sites make it possible to see when a button got focus. When using the Tab key for submitting a question or answer this is quite useful to make sure you don't accidentally open a link by hitting the Enter key and lose your text input.

For example on the Bitcoin SE, this is how the submit button looks:

submit button without focus

And this is how it looks when focused (by alt-tabbing twice from the text input field):

submit button with focus.

  • Can you add a screenshot? Perhaps it will get a bit more attention this way. – Jacob Jan Tuinstra May 14 '13 at 19:54
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    Done. It also counts for the Add Comment button :) – Steven Roose May 14 '13 at 20:05
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This appears to have been done with the redesign a couple of years ago. The text of the button switches from dark to white when the button gets focus.

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