[Catalyst] Tool for rendering web pages consistently though time ?

[lanas]

Hi,

  I'm looking for a tool/procedure that could render web pages in a
consistent manner without having to rely on the screen resolution and
fonts of a workstation so that, through time - and through many OS
updates of various sorts - it'd be possible to always render the pages
in the exact same way, for documentation purposes.  Perhaps some kind
of virtual screen that always uses the same parameters and whose output
whould be in svg of jpg.

  Is there a way of doing that ?

  Thanls for any ideas/suggestions.

Cheers.