> It doesn't break like that in MSIE as you well know.

How so? I fired up my copy of IE 8 and the Script Debugger worked
great - broke right on the throw breakpoint - virtually identical to
Firebug (I'm really enjoying the new developer tools in IE 8).

> What are you measuring here? Think about that.

I'm measuring how quickly the bound handlers are being executed.

Let's assume that there's a few mousemove handlers bound to the
document (not an unreasonable assumption) and they take 5ms to run,
total. That means that we can achieve a maximum event rate of 200
events per second. Using the numbers from before, we have an
approximately .2ms overhead on every call with your method (in Firefox
3) - this instantly bumps our event rate down to about 192 events per
second - and that's not including all the mouseover/mouseout events
that'll also occur, chalking up more overhead.

> Also, the timings for MSIE are not provided.

So I integrated your code but it doesn't appear to work - the
onpropertychange event just doesn't fire.

My reference page:
http://ejohn.org/files/handler-ready.html

I'll provide numbers for MSIE once I can get the example running.

--John

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