See invisible GIF.
"1-by-1 GIF." YourDictionary, n.d. Web. 11 October 2018. <http://www.yourdictionary.com/1-by-1-gif>.
1-by-1 GIF. (n.d.). Retrieved October 11th, 2018, from http://www.yourdictionary.com/1-by-1-gif
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