<p dir="auto">Consider using the method described here: <a href="http://css-tricks.com/inheriting-box-sizing-probably-slightly-better-best-practice/" rel="nofollow">http://css-tricks.com/inheriting-box-sizing-probably-slightly-better-best-practice/</a> to have fewer unintended side-effects.</p>
<p dir="auto">I found this helpful while working on migrating a large legacy site over to new markup and CSS best practises.</p>
<p dir="auto"><a href="http://css-tricks.com/inheriting-box-sizing-probably-slightly-better-best-practice/" rel="nofollow">http://css-tricks.com/inheriting-box-sizing-probably-slightly-better-best-practice/</a></p>
<p dir="auto">It allows us to toggle off box-sizing for large parts of the site we haven't migrated yet, and is a nice default approach to take.</p>