Harrisonbro

var subpixelWordSpacing = false;
if (document.defaultView && document.defaultView.getComputedStyle) {
	var originalSpacing = document.defaultView.getComputedStyle(document.documentElement, null).wordSpacing; 
	document.documentElement.style.wordSpacing = '0.5px';
	subpixelWordSpacing = document.defaultView.getComputedStyle(document.documentElement, null).wordSpacing === '0.5px';
	document.documentElement.style.wordSpacing = originalSpacing;
}