Check for SVG support without Modernizr or jQuery

svg.js

/**
 * Check for SVG support (modified to support data-src attribute)
 * Source: http://www.prosoxi.com/2013/04/24/svg-replace-using-modernizr/
 * 
 * Usage (CSS):
 *   .svg .element { background-image: url('image.svg'); }
 *   .no-svg .element { background-image: url('image.png'); }
 * 
 * Usage (HTML):
 *   <img src="image.svg" data-src="image.png" alt="" />
 */

function supportsSVG() { return !! document.createElementNS && !! document.createElementNS('http://www.w3.org/2000/svg', 'svg').createSVGRect; }

// SVG supported
if ( supportsSVG() ) {

	// Add "svg" class to HTML element
	document.documentElement.className += ' svg';

// SVG not supported
} else {

	var imgs = document.getElementsByTagName('img'),
		dotSVG = /.*\.svg$/, i = 0, dataSrc = false;

	// Add "no-svg" class to HTML element
	document.documentElement.className += ' no-svg';

	// Replace all images with a data-src attribute specified
	for ( i = 0; i !== imgs.length; ++i ) {
		dataSrc = imgs[i].getAttribute('data-src').trim();
		if ( imgs[i].src.match( dotSVG ) && dataSrc ) {
			imgs[i].src = dataSrc;
		}
	}

}

svg.min.js

/**
 * Check for SVG support (modified to support data-src attribute)
 * Source: http://www.prosoxi.com/2013/04/24/svg-replace-using-modernizr/
 * 
 * Usage (CSS):
 *   .svg .element { background-image: url('image.svg'); }
 *   .no-svg .element { background-image: url('image.png'); }
 * 
 * Usage (HTML):
 *   <img src="image.svg" data-src="image.png" alt="" />
 */
function supportsSVG(){return!!document.createElementNS&&!!document.createElementNS("http://www.w3.org/2000/svg","svg").createSVGRect}if(supportsSVG())document.documentElement.className+=" svg";else{var imgs=document.getElementsByTagName("img"),dotSVG=/.*\.svg$/,i=0,dataSrc=!1;for(document.documentElement.className+=" no-svg",i=0;i!==imgs.length;++i)dataSrc=imgs[i].getAttribute("data-src").trim(),imgs[i].src.match(dotSVG)&&dataSrc&&(imgs[i].src=dataSrc)}