(sigh, messed up sender address so the original got rejected from the whatwg 
list, apologies for the duplicate message...)

Ian Hickson wrote:
I haven't changed the target of the event, it's still the Document object. This is a little odd, though, would people rather I made it the <body> element with an auto-forward to the Window object, like the 'load' event and so forth? That would allow onmessage="" handles to be written.

I've mentioned this on IRC but should probably mention it here so it's in the 
record, so to speak.  I don't see a strong use case for an onmessage attribute. 
 Event handler attributes are useful for quick little things, but accepting 
messages from other sites seems neither quick (aside from free-for-all walls I 
can't think of things you'd want to do that wouldn't be fairly involved) nor 
little (you need the origin check at a minimum, then you have to do whatever 
you're going to do, and it's a lot to stuff in an attribute -- and if you're 
just delegating to another method, why not just set the method as handler 
programmatically?).  I don't think having to do it via script is particularly 
burdensome.

Jeff

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