For an input type of file, how do you use the attribute? I know it accepts context types, but I'm not sure what I would put if I wanted only .gif and .jpg images to show up.

I also know that they can still get a different type of file in there, so I'll also check it on the server side, but I'd like to only have it initially show those two file types.

I tried searching the forum (but not the web much), and didn't find an answer.