[whatwg] Custom protocol handlers

[Bjartur Thorlacius]

Þann sun 17.júl 2011 22:46, skrifaði Ben Schwarz:
>
> 3)
> As a web designer / developer
> I want to be able to ascertain if another website has registered a custom protocol handler in the user’s browser
> So that I can knowingly design and implement an integration experience
>
> 4)
> As a web designer / developer
> I want to be able to ascertain whether the user has "installed" a custom protocol handler within their operating system
> So that I can knowingly design and implement an integration experience
>
Your requirements seem reasonable at first glance, but it's hard to tell 
if and how to give this information without a concrete example of how it 
is going to be used. How is designing and implementing an "integration 
experience" possible with the information that a competitor has 
registered a protocol handler?