Where can I find javascript reference about browsers compatibility?

hi
Where can I find javascript reference about browsers compatibility (newer and older versions)?
I want a completed reference in objects properties, methods and events.
for example, which browsers or versions support these:
      document.getElementById or document.all ...
      event.pageX or event.X ...
      obj.top or obj.pixelTop ...
thanks
yadafarinAsked:
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Michel PlungjanIT ExpertCommented:
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