Recently, a colleague sent me a document detailing the DITA message specialization. The document is an HTML Help file, and I noticed that many of the links in the file (which described certain DITA elements) had tooltips which appeared when I held the mouse pointer over them.
I viewed the source of one of the topics in the file, and discovered that the author of the document had added the HTML title attribute to the links, along with a description of each DITA element. It was a simple and effective solution, one which didn’t require any scripting. Overall, it was a nice touch.
Then, I began to wonder how useful something like this actually is.