// https://github.com/Modernizr/Modernizr/issues/572 // http://jsfiddle.net/glsee/JDsWQ/4/ Modernizr.addTest('cssvmaxunit', function(){ var bool; Modernizr.testStyles("#modernizr { width: 50vmax; }", function(elem, rule) { var one_vw = window.innerWidth/100, one_vh = window.innerHeight/100, compWidth = parseInt((window.getComputedStyle ? getComputedStyle(elem, null) : elem.currentStyle)['width'],10); bool = ( parseInt(Math.max(one_vw, one_vh)*50,10) == compWidth ); }); return bool; });