servo/servo — pull request #4340 by michaelwu (2014-12-11 22:45:48+00:00)
Title: Add support for the 'rem' css unit

This works on my simple test page https://people.mozilla.org/~mwu/rem.html , hopefully works on real pages too. Seems a little messy to add root_font_size directly to ComputedValues, but it didn't seem appropriate to add to the style structs.