SVG feature detection script, with SVG to PNG fallback and HTML classes

gistfile1.txt

// SVG custom feature detection and svg to png fallback
// toddmotto.com/mastering-svg-use-for-a-retina-web-fallbacks-with-png-script#update
function supportsSVG() {
  return !! document.createElementNS && !! document.createElementNS('http://www.w3.org/2000/svg','svg').createSVGRect;	
}
if (supportsSVG()) {
	document.documentElement.className += ' svg';
} else {
	document.documentElement.className += ' no-svg';
	var imgs = document.getElementsByTagName('img'),
		dotSVG = /.*\.svg$/;
	for (var i = 0; i != imgs.length; ++i) {
		if(imgs[i].src.match(dotSVG)) {
			imgs[i].src = imgs[i].src.slice(0, -3) + 'png';
		}
	}
}