History
David Siegel's 1996 book Creating Killer Web Sites was allegedly the first to publish the Spacer GIF technique. According to Siegel, he invented the trick in his living room.
The use of spacer GIFs has declined due to the prevalence of Cascading Style Sheets (CSS) for laying out web pages, which achieves the same effect by changing the margin or padding on a given element. If used properly, CSS reduces unnecessary code in a web page. Blank 1×1 GIFs are still occasionally used to fix a PNG rendering limitation in Microsoft Internet Explorer versions 5.5 – 6.
Read more about this topic: Spacer GIF
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