Hi all,

(reposting from Dart Web Development)
 
With "attributes", we have some way to succinctly communicate to an 
element's users what properties they can set at the instantiation point. 
Why don't we have something similar for custom events that an element can 
fire? Something like:

<polymer-element name="my-element" attributes="height width" 
custom-events="open activate">

...

<my-element height="100" width="200" on-open="onOpen" 
on-activate="onActivate"></my-element>

The way it is now, users are left to either rely on the documentation 
(unreliable) or hunt all fire() and asyncFire() calls in the element's code.

If "custom-events" were added, it would be nice to also check, for every 
fire()/asyncFire() call, that the element actually declares the event being 
fired.

I bet all this would save a lot of debugging hours for a lot of people.

--Sergey

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