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function isAnimatedGif(src, cb) {
	var request = new XMLHttpRequest();
	request.open('GET', src, true);
	request.responseType = 'arraybuffer';
	request.addEventListener('load', function () {
		var arr = new Uint8Array(request.response),
			i, len, length = arr.length, frames = 0;
			
		// make sure it's a gif (GIF8)
		if (arr[0] !== 0x47 || arr[1] !== 0x49 ||