Schepp/box-sizing-polyfill — pull request #47 by smithwib (2014-12-10 14:36:28+00:00)
Title: Rewrote a good portion of this to try to create a more consistent method...

... of calculation, also added support for thin|thick|medium border widths (direct replacement) and error handling. In testing, I hit it in IE7 native and in IE7 emulation and compatibility views in IE8/IE9/IE11.