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Re:Inventing Favicon.ico by swift on Sunday March 29, 2015 @10:09PM (#9287299)
SVG images support media queries, which handles this use case pretty well. See here:

http://blog.cloudfour.com/media-queries-in-svg-images/

Re:Inventing Favicon.ico by wvenable on Monday March 30, 2015 @12:49AM (#9287704)
And circle is complete: infinitely scalable icons defined for specific resolutions!