[webkit-dev] About WebIDL supplemental interfaces

Adam Barth abarth at webkit.org
Thu Jul 19 09:31:45 PDT 2012

On Thu, Jul 19, 2012 at 9:29 AM, Andrei Bucur <abucur at adobe.com> wrote:

> Hey Kentaro,
> On 7/19/12 6:20 PM, "Kentaro Hara" <haraken at chromium.org> wrote:
> >Hi Andrei
> >
> >> I'm asking this because CSS Regions spec defines the Region interface
> >>as an
> >> WebIDL supplemental interface that needs to be implemented by any object
> >> that can be a region (Element, Pseudo elements etc.). Is there a way in
> >> WebKit to write an interface that "implements" another as specified by
> >> WebIDL?
> >
> >Currently, no. (Correct me if I'm wrong.)
> >
> >> However, WebKitIDL defines "Supplemental" more like a "partial
> >>interface":
> >> http://trac.webkit.org/wiki/WebKitIDL#Supplemental
> >
> >The current WebKitIDL implementation is "on the way". Eventually we
> >want to remove the [Supplemental] IDL attribute and support the "A
> >implements B" syntax as defined in the WebIDL.
> >
> >Do you have any alternative solution to make CSS Regions work without
> >the "A implements B" syntax? If no, maybe it's time to consider
> >supporting the "A implements B" syntax (, which would require a
> >substantial amount of work though:-).
> The only way I can see this implemented without the new syntax is by
> writing some crazy hacks, probably very similar with how EventTarget
> works. And even then I'm not sure everything will work out well. Right
> now, hacking things in does not seem to worth the effort, especially if
> it's going to be removed once the "implements" syntax gets in. I'm open to
> suggestions though :).

Can you say what specifically in the CSS regions spec is giving you trouble?


> However, it would be nice to have the new syntax on board sooner than
> later. Is there a roadmap for adding this in WebKit? I'm sure you are very
> busy so having a timeline would allow other hackers help move the
> implementation forward :).
> Thanks,
> Andrei.
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