- From: Ian Hickson <ian@hixie.ch>
- Date: Mon, 3 Dec 2012 19:05:35 +0000 (UTC)
- To: Boris Zbarsky <bzbarsky@MIT.EDU>, Cameron McCormack <cam@mcc.id.au>
- Cc: whatwg <whatwg@lists.whatwg.org>
On Mon, 3 Dec 2012, Boris Zbarsky wrote:
>
> Consider this testcase:
>
> var desc = Object.getOwnPropertyDescriptor(HTMLElement.prototype,
> "onscroll");
> desc.set.call(document.body, function() { alert(this); });
>
> Is the listener added on the body, or the window?
>
> The relevant parts of the spec are:
>
> 1) "onscroll" is present on both HTMLElement.prototype and
> HTMLBodyElement.prototype. This testcase explicitly invokes the setter for
> the former.
>
> 2) The spec text at
> http://www.whatwg.org/specs/web-apps/current-work/multipage/webappapis.html#handler-onscroll
> (scroll up; there is no way to link to the actual text) says:
>
> The following are the event handlers (and their corresponding event
> handler event types) that must be supported by all HTML elements
> other than body and frameset, as both content attributes and IDL
> attributes, and on Document objects, as IDL attributes
>
> It's not clear to me what this means since the properties are on
> HTMLElement.prototype so they can be applied to all HTML elements.
> What does this text mean in terms of the testcase above?
>
> Basically, I can see three possible behaviors here. Either the
> HTMLElement.prototype.onscroll setter behaves the same way on all
> elements (and hence the above adds the event handler on the body) or it
> behaves specially for the body element, forwarding to the window (and
> then we don't need HTMLBodyElement.prototype.onscroll), or it throws for
> the body element. Which one is intended?
What do browsers do?
This should probably be defined in WebIDL. It relatess also to:
https://www.w3.org/Bugs/Public/show_bug.cgi?id=17201
--
Ian Hickson U+1047E )\._.,--....,'``. fL
http://ln.hixie.ch/ U+263A /, _.. \ _\ ;`._ ,.
Things that are impossible just take longer. `._.-(,_..'--(,_..'`-.;.'
Received on Monday, 3 December 2012 19:18:08 UTC