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From: Thomas 'PointedEars' Lahn <PointedEars@web.de>
Reply-To: Thomas 'PointedEars' Lahn <usenet@PointedEars.de>
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Date: Fri, 22 Feb 2013 01:12:59 +0100
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Subject: Re: Script in <a > tag in IE
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Scott Sauyet wrote:

> […]  I'm quite certain that no sane implementor would create a
> new Function instance every time the event listener is needed.  But
> beyond that, it's not clear to me whether a lazy instantiation would
> be better because the listener might never be called, or if there is some
> spin-up time for the compiler that would make it simpler to pre-compile
> them all.

Certainly.  That there is a Function instance when the property is accessed 
does not need to mean that there is also a Function instance when it is not.  
It appears to be prudent that there is a getter that creates the Function 
instance and returns a reference to it not before the property is accessed, 
or there may be a factory that creates the Function instance when the event 
is dispatched to the element.

Insofar one should generally expect event-handler attributes to be more 
efficient than event-handler properties (and their correspondent API 
features) because with the latter the Function instance needs to be created 
first (by the developer).

> And then there is the question of redefining the event-handler
> attributes...

What is the question?

-- 
PointedEars

Twitter: @PointedEars2
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