Re: [whatwg] DOM Events Proposal: EventListenerOptions 'mayCancel' for improved scroll performance from Philip Jägenstedt on 2015-07-09 (public-whatwg-archive@w3.org from July 2015)

From: Philip Jägenstedt <philipj@opera.com>
Date: Thu, 9 Jul 2015 18:43:28 +0200
To: Boris Zbarsky <bzbarsky@mit.edu>
Cc: WHATWG <whatwg@lists.whatwg.org>
Message-ID: <CAMQvoCku9SV3nWzwEgOX2AVMxtvWd9ABT0=9axDes_crn-edag@mail.gmail.com>

On Thu, Jul 9, 2015 at 6:40 PM, Boris Zbarsky <bzbarsky@mit.edu> wrote:
> On 7/9/15 8:42 AM, Philip Jägenstedt wrote:
>>
>> Would there be any way to feature detect support for EventListenerOptions
>> as the third
>> argument?
>
>
> Yes.  You call addEventListener and pass an object that has getters for the
> properties you care about detecting.  If those getters get invoked, the
> browser knows about those dictionary properties.

Ah, that's cool :)

Philip

Received on Thursday, 9 July 2015 16:43:56 UTC