twitter/bootstrap — Issue #1543: button styles
Author: andriytyurnikov
Created: 2012-02-01 19:02:14+00:00
State: open

Generally there are 3 tags that may be styled as buttons:
a, input[type=submit], button
if you'll put them into one line you'll see that horizontal alignment is inconsistent, which must be related to different margin/padding/height of those elements.