Fyrd/caniuse — pull request #40 by cheba (2012-10-22 17:09:01+00:00)
Title: Update features-json/viewport-units.json

Mozilla Bugzilla [Bug 503720](https://bugzilla.mozilla.org/show_bug.cgi?id=503720) - Implement vw/vh/vmin/vmax (viewport sizes) from CSS 3 Values and Units