[webkit-dev] Multiple inheritance in the DOM

[Alexandru Chiculita]

On 25.07.2012, at 18:16, Alan Stearns wrote:

> From:  Adam Barth <abarth at webkit.org>
> Date:  Wednesday, July 25, 2012 6:05 PM
> To:  Sam Weinig <sam at webkit.org>
> Cc:  Elliott Sprehn <esprehn at google.com>, Alan Stearns
> <stearns at adobe.com>, Kentaro Hara <haraken at chromium.org>,
> "webkit-dev at lists.webkit.org" <webkit-dev at lists.webkit.org>
> Subject:  Re: [webkit-dev] Multiple inheritance in the DOM
> 
> On Wed, Jul 25, 2012 at 6:00 PM, Sam Weinig <sam at webkit.org> wrote:
> 
> On Jul 25, 2012, at 5:53 PM, Elliott Sprehn <esprehn at google.com> wrote:
> 
>>>> It seems like this should really be a [NoInterfaceObject].
>>>> That resolves the issue of multiple inheritance since you
>>>> can no longer do instanceof Region, and I'm not sure why
>>>> you'd ever want to do that anyway.
> 
>>> I agree.
> 
>> That doesn't solve the problem.
> 
> But it's a good idea. I'll add it to the spec.

I don't see any advantage in having the interface anyway, so why don't we just it let be a separate object and add two helper methods instead. I can only imagine that other browsers might have the same issue anyway.

document.getRegionForElement(element)
-> where element can be both Element and CSSPseudoElement
-> this may return null in case of no region being associated, so there's no need for instanceof tricks anymore.

region.element
-> that can return either Element or CSSPseudoElement

BTW, is there any base class shared across Element and CSSPseudoElement?

Thanks,
Alex