- From: Boris Zbarsky <bzbarsky@MIT.EDU>
- Date: Sun, 12 Aug 2012 16:55:13 -0400
- To: Brendan Eich <brendan@mozilla.com>
- CC: Brandon Benvie <brandon@brandonbenvie.com>, public-script-coord@w3.org, es-discuss@mozilla.org
On 8/12/12 4:31 PM, Brendan Eich wrote: > However, check me here: the GSP makes "own" global properties on demand, > when names of DOM elements that come from name= and id= attributes (or > just id=? I forget) are used as identifier expressions. That's what it does in Gecko's impl right now. It has a bunch of issues, including the properties not going away when the name or id attributes change or the relevant element is removed from the document. If you want properties to go away, then you need to either explicitly delete the properties (and then you have to be able to tell apart properties you added from properties the page defined!) or you have to use a proxy (in ES5 terms). Per the current spec proposal, the GSP lives on the proto chain and exposes the various id/name stuff as own properties on itself, with the usual caveats about checking up the proto chain first that DOM named access has. See http://dev.w3.org/2006/webapi/WebIDL/#NamedPropertiesObject (which Window uses). There was a bunch of previous discussion about this at http://lists.w3.org/Archives/Public/public-script-coord/2012JanMar/0010.html and following, though it's not clear to me now whether the solution we decided on allows var to shadow these named props as desired after all... -Boris
Received on Sunday, 12 August 2012 20:55:49 UTC