> On May 21, 2015, at 7:38 PM, Anne van Kesteren <ann...@annevk.nl> wrote:
> On Fri, May 22, 2015 at 1:25 AM, Anders Carlsson <ander...@apple.com> wrote:
>> Sam Weinig 2015-05-15 10:12:54 PDT:
>>> Support for navigator.registerProtocolHandler/unregisterProtocolHandler is 
>>> not something we want to support in WebKit2 at this time as we are not 
>>> confident it is a good Web API. This might be a good conversation for 
>>> webkit-dev.
>> I agree with Sam.
> So what else should web-based email or IRC clients or some such use to
> integrate with sites that offer mailto and irc URLs? Especially for
> email it seems like a worthwhile thing to solve. And that there's no
> cross-browser way to do it in 2015 is somewhat of a shame.

I think it’s useful to have an API for the "mailto" use case. A lot of people 
use webmail as their default mail client, and it seems nice to make mailto: 
links do the right thing for them. We do allow changing the default Mail reader 
to a native app, at least on Mac. I would almost consider having 
navigator.registerProtocolHandler just for that use case.

On the face of it, the registerProtocolHandler API seems more general than 
necessary, but the actual spec for it has a whitelist of specific schemes, most 
of which seem reasonable for this kind of purpose: 

I am curious what Sam and Anders dislike about this API, and whether it might 
be something we’d want to support at least with a more restricted set of 

(I am more dubious of the content handler aspect.)


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