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JavaScript animated GIF detection!
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| isAnimatedGif = (src, cb) -> | |
| request = new XMLHttpRequest() | |
| request.open "GET", src, true | |
| request.responseType = "arraybuffer" | |
| request.addEventListener "load", -> | |
| arr = new Uint8Array request.response | |
| return cb false if arr[0..3] isnt [0x47,0x49,0x46,0x38] | |
| request.send() |
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