Cookies (and "Flash Cookies") are often blocked. So is there another way to identify and spy on website visitors? Some quite unknown way is to use iframes or a series of redirects to pollute the user's "visited pages" history. Most people do not delete it because they use it on news sites. This information can be read via CSS properties: Put links with a known text into an "overflow=hidden" div, use different font sizes for visited and unvisited links, and read the offsetHeight of the divs to see whether the link has been visited or not.
For some reason, this does not work in IE (but works well in Firefox and Opera). Testing visited links works perfectly, but making links visited just does not work (it does in some cases, but I could not find any where it works without user interaction). Does anyone know why this does not work in IE and how to "fix" it?
schierlm at gmx dot de