In this case it's the RSS feed itself, not the reader. The image in the feed is just a static PNG: http://imgs.xkcd.com/comics/frequency.png http://imgs.xkcd.c

In this case it's the RSS feed itself, not the reader. The image in the feed is just a static PNG: http://imgs.xkcd.com/comics/frequency.png http://imgs.xkcd.com/comics/frequency.png Which did somewhat confuse me as well until I looked at the actual website.