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The charts are organized by operating system, including Windows, Macintosh, Linux, Unix, IBM OS/2 Warp, BeOS, Televisions & Game Consoles, Amiga, Acorn, RiscOS, NeXTStep, and AtheOS.
I'm still hoping for some enterprising soul to catalog the details of javascript support, at least over the principal and most recent browser versions -- and most especially bugs in the most commonly used objects of the DOM.
Please drop me a Sticky Mail if you see such a resource and I'll post the link.