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// test by github.com/nsfmc
// "The 'rem' unit ('root em') is relative to the computed
// value of the 'font-size' value of the root element."
// http://www.w3.org/TR/css3-values/#relative0
// you can test by checking if the prop was ditched
// http://snook.ca/archives/html_and_css/font-size-with-rem
Modernizr.addTest('cssremunit', function(){
var div = document.createElement('div');
try {
div.style.fontSize = '3rem';
} catch(er){}
return (/rem/).test(div.style.fontSize);
});