This article needs to be updated. In particular: Dated information, mouseover events do a lot more these days..December 2018)(
A special usage of mouseover event is a tooltip which shows a short description of the object under the pointer. The tooltip appears only after the mouse or stylus is held over the object for a certain amount of time.
<!-- Direct usage is not recommended. It does not conform with web standards. --> <img id="myImage" src="/images/myImage.jpg" onMouseOver="alert('your message');">
- Advanced CSS Menu | by Web Designer Wall
- "A vocabulary and associated APIs for HTML and XHTML". Retrieved 16 February 2015.