Below, you should see a happy face.
The XHTML that displays the image is: <img src="happy" alt="A happy face" /> .
Since no file extension is specified, the type is negotiated between your web browser and the server. The text in the lower-right of the image indicates which type you're actually seeing (probably PNG or GIF).
The following versions of this image are available in this directory. When your browser gets the above, it's negotiating between these:
- happy.png. A PNG image.
- happy.gif. A GIF image.
- happy.pnm. A PNM image.
- happy.pnm.gz. A compressed version of the PNM image.
- happy.tif. A TIFF image.
- happy.eps. A scalable EPS image.
- happy.fig. The original XFIG image.
The point is that any browser that can display any of these will be able to see the image (and the best version of it).