There are many ways for sites to store persistent data on the client side.
Since NoScript apparently solved the problem, I'm inclined to think they used Flash LSOs. Many advertising agencies use a small, invisible applet that creates and sends these special cookies. I don't see why trackers can't do that either.- Standard HTTP Cookies
- Local Shared Objects (Flash Cookies)
- Silverlight Isolated Storage
- Storing cookies in RGB values of auto-generated, force-cached
PNGs using HTML5 Canvas tag to read pixels (cookies) back out
- Storing cookies in Web History
- Storing cookies in HTTP ETags
- Storing cookies in Web cache
- window.name caching
- Internet Explorer userData storage
- HTML5 Session Storage
- HTML5 Local Storage
- HTML5 Global Storage
- HTML5 Database Storage via SQLite
No.
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