I'm trying to figure out a method of storing a unique reference to each tag on a particular page. I won't have any ability to edit the page content and I'll the generated UID to stay the same on every page refresh.

Since browsers don't generate any kind of UID for elements, I was thinking that the only method to do this would be to execute a script which walks the DOM and creates a UID for each it comes across. I don't know how accurate this will be, especially considering I'll need to ensure it creates the same UID for the tag each time the script crawls the page.

Can anyone think of any other, more accurate ways of mapping a page?

Many thanks.