Finding core javascript calls that are incompatible with IE6/7/8

Question

Hey is there a jslint-like inspector that will flag on calls that are incompatible with older versions of IE? or just cross browser incompatible calls in general?

Answer 1

You could use the closure compiler with a custom externs file which doesn't define any of the things missing in IE from the compatibility table of your choice (the kangax one linked above, or you could use one from quirksmode).

Answer 2

Use a cross browser library like MooTools. It automatically adds missing methods for IE, also makes writing javascript easier.