css3_grad-radial.js Example File

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 window.onload = function() {
     var el = document.querySelector('#main');
     el.addEventListener('mousedown', function(event){

         var colors = [ 'beige', 'crimson', 'darkcyan', 'turquoise',
             'darkgoldenrod', 'darkorange', 'fuchsia',
             'greenyellow', 'lightblue', 'lightcoral',
             'lightgreen', 'mediumorchid', 'pink', 'plum',
             'skyblue', 'springgreen', 'tan', 'tomato',
             'violet', 'yellow', 'teal'];

         var x = event.offsetX;
         var y = event.offsetY;

         var loc = document.querySelector('#localStyles');
         var style = '#main:active {' + 'background: -webkit-gradient(radial, ';
             style += (x + ' ');
             style += (y + ' ');
         style += ',5,';
             style += ((x + 10) + ' ');
             style += ((y + 10) + ' ');
         style += ', 48, ';
             style += 'from(' + colors[r(5)] + '),';
             style += 'color-stop(20%, ' + colors[r(5)] + '),';
             style += 'color-stop(40%, ' + colors[r(5)] + '),';
             style += 'color-stop(60%, ' + colors[r(5)] + '),';
             style += 'color-stop(80%, ' + colors[r(5)] + '),';
             style += 'to(#ffffff) );'
             style += '}'
         loc.innerHTML = style;
     });
 }

 function r(i) {
     return Math.floor( (Math.random() * i ) );
 }