I recently ran into a problem that was really hard to figure out. I was working on a responsive design where I used img {max-width:100%;} to make sure that images would be downsized rather than overflow in narrower viewports.
It worked great everywhere… until I went to check in IE8. The site’s logo was gone! None of the usual IE bug fixes cured the problem, and it took me quite a while to realise that max-width was part of the problem.
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