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!|