A way of explicitly reporting exceptions

[Domenic Denicola]

From: Allen Wirfs-Brock <allen at wirfs-brock.com>

> I was under the impression that DOM triggered event listeners ran in their own turn

[Nope](http://jsbin.com/gaxapora/1/edit?html,console).

> and that this was the model we would want to generally apply to ES events.

Maybe (probably?); there are strong arguments on both sides. We've certainly stuck with that story for anything vaguely event-like so far, viz. promises and `Object.observe`.