Replace SVG with PNG

gistfile1.txt

function supportsSVG() {
    return !! document.createElementNS && !! document.createElementNS('http://www.w3.org/2000/svg','svg').createSVGRect;
}
if (!supportsSVG()) {
    var imgs = document.getElementsByTagName('img');
    var dotSVG = /.*\.svg$/;
    for (var i = 0; i !== imgs.length; ++i) {
        if(imgs[i].src.match(dotSVG)) {
            imgs[i].src = imgs[i].src.slice(0, -8) + 'png';
        }
    }
}