You may never need this but you can also trigger changes when the user scrolls.  Modern CSS can be used to achieve most things which this event was once used for.  However, there are always new uses for things on the Web.

Make a copy of linksinternal.html called scroll.html.  Inside the body opening tag add an event trigger like this:

<body onscroll="scrollFunction();">

Create the function with that name and alert something inside it.  When you try the page the first scroll you do will give you as many alert messages as the jumps you scroll down.  Not very useful but the same principle could be used to move things on the page or to load new content to display as the user scrolls.