Strange border on IMG tag

Question

HTML:

CSS:

Answer 1

It's the default "special" border that appears when you use an img element with an a src attribute set to something that doesn't exist (or no src at all).

A common workaround is to set the src to a blank.gif file:

I have to point out that it (in this case) makes no sense to use an with background-image. Just set the src attribute and forget about background-image.