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Feature detect base64 support for images in mootools
(function() {
Browser.Features.base64 = null;
var callback = function() {
Browser.Features.base64 = this.width == 1 && this.height == 1;
// alert(Browser.Features.base64); // true || false
var img = new Image(), element = || new Element("img");
element.onload = element.onerror = element.onabort = callback;
// 1x1 px gif to test with
img.src = "data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///ywAAAAAAQABAAACAUwAOw==";

is it humanly possible to make more mistakes on a less-than-10 lines snippet? hopefully it's now done and dusted.

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