This is something I have known about for a long time. It is advanced and can mostly be used for Cross Site Request Forgeries (CSRF). Not that I condone these, but the best way to defend yourself against hackers is by knowing as much as they do.
In some cases users turn javascript off in their browsers (I do) for security reasons. HTML has just about no scripting capabilities if you discard the FOR attribute on the LABEL tag. It is possible to trick a user into submitting a form by them simply highlighting text on a page. The FOR attribute binds a label to another element, which is some sort of scripting, I guess.
