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var cssCalc = (function () {
	$('body').append('<div id="css-calc"></div>');
	var cssCalc = Number($('#css-calc').width());
	$('#css-calc').remove();
	if(cssCalc === 10) {
		return false;
	} else {
		return true;
	}
}());

#css-calc {
	width: 10px;
	width: calc(10px + 10px);
	width: -webkit-calc(10px + 10px);
	display: none;
}