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I've seen the button in the links area (two questions) due to text overflow, but that's nothing compared to this:
On my phone browser, the button is usually completely covered by ad.
I think a very simple but effective solution is to put the button under the comment box, just like the answer button.
Use ad blocking software.
It's acceptable but not satisfactory, and there doesn't seem to be such a thing for my HTC Incredible.
Press Enter.
I'll actually be doing this, since getting out of input mode and looking for a button to click is way harder, no matter where the button is located.
I still think it's more consistent to put the button below, though.
(I wonder if there's a badge for too many self answers.)
