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Re: [DOM4] EventTarget.dispatchEvent() is synchronous, right?

From: Jonas Sicking <jonas@sicking.cc>
Date: Mon, 19 Sep 2011 16:33:31 -0700
Message-ID: <CA+c2ei8UutCUek0w+rWJ5+e+sn8wrETk76+yK4ODB_PjNjNcwQ@mail.gmail.com>
To: David Flanagan <dflanagan@mozilla.com>
Cc: www-dom@w3.org
On Mon, Sep 19, 2011 at 4:02 PM, David Flanagan <dflanagan@mozilla.com> wrote:
> My reading of the DOM4 spec is that EventTarget.dispatchEvent() is
> completely synchronous and does not involve the event loop in any way and
> that any event handlers triggered in response to the dispatched event are
> invoked before dispatchEvent() returns to its caller.
>
> The reason I ask is that browsers (at least Firefox and Chrome, and possibly
> Safari) don't seem to implement it fully synchronously, and it is easy to
> hose them with thousands of calls to dispatchEvent().  Does HTML or some
> other spec override the DOM4 requirements?

Yup, this is very true. However it's no different from hosing the
browser using repeated calls to Array.map or writing code like
while(1) { /* do nothing */ }.

/ Jonas
Received on Monday, 19 September 2011 23:34:36 GMT

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