Toby Speight's demo of emacs-w3 alt texts

writes:

First one is a full window view, on an X display (emacs also runs on ordinary terminals, of course). The different coloured links are because one has been visited and one hasn't - similar to the behaviour of Mosaic (and presumably others) which track visited anchors.

The second and third show mouse highlighting of images as the mouse moves over. There's something strange in my system that makes images and links highlight the same way if I only have one window open (highlighted links use bold text when I open a new window - a "frame" in emacs parlance) but the action of screen capture removes the highlight if I have more than one frame open. Strange!