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An example of some of the characteristics that might be captured:
It should be noted that this is not an exhaustive list, and suggestions are welcome. It is more desirable to capture data which is less likely to change (a listing of the browser's fonts, for example) versus data which is more likely to change (the window height).
At a minimum, the following should be captured:
Browser Plugin details (Shockwave, Flash, WindowsMediaPlayer, Silverlight, Adobe Acrobat) *
Screen size (height x width)
Screen color depth
Supercookie test (DOM localStorage, DOM sessionStorage, IE userData)
1st party cookies enabled
3rd party cookies enabled
* IE8 and above prompts the user for permission to load certain non-default plugins in order to reference version of these plugins, so the IE routine should allow setting a subset of plugins to check (only) so that this user warning can be avoided.
An example of this collection exists here:
(click "test me" to see the results)