Until now, Firefox has ignored the
line-height property specified on the
<input> element, and always applied
normal, while Internet Explorer and WebKit-based browsers allow authors to increase (but not decrease) the value. To improve interoperability, this behaviour has been changed to accept author-defined values. For backward compatibility, single-line text
<input> elements still cannot have a
line-height smaller than
A regression from this change has been found on IKEA.com where the
1px, though this is considered intentional.