Bug 75575

Summary:	Improve variable resolution order on window
Product:	WebKit	Reporter:	Ojan Vafai <ojan>
Component:	JavaScriptCore	Assignee:	Nobody <webkit-unassigned>
Status:	NEW ---
Severity:	Normal	CC:	ap, arv, barraclough, fpizlo, gregsimon, oliver, sam
Priority:	P2
Version:	528+ (Nightly build)
Hardware:	Unspecified
OS:	Unspecified
URL:	https://bugs.ecmascript.org/show_bug.cgi?id=78
Bug Depends on:	49739, 84247, 85001
Bug Blocks:

Description Ojan Vafai 2012-01-04 14:19:38 PST

WebKit's variable resolution order on window has caused a number of bugs for the Closure Compiler. See http://code.google.com/p/chromium/issues/detail?id=80591 for more details of the case that keeps biting them.

Also see http://lists.w3.org/Archives/Public/public-webapps/2011AprJun/0389.html and http://lists.w3.org/Archives/Public/public-script-coord/2012JanMar/0010.html for discussion on standardizing this. The discussion is not quite done, but it seems likely the WebKit/JSC/V8 will need to change.

Comment 1 Greg Simon 2012-01-17 11:27:13 PST

I looked at a CL for this bug and yes it does require a v8 change for v8-based webkit browsers.

Comment 2 Ojan Vafai 2012-01-27 15:48:47 PST

OK. This is resolved now. http://lists.w3.org/Archives/Public/public-script-coord/2012JanMar/0104.html

Comment 3 Erik Arvidsson 2012-04-24 16:35:29 PDT

V8 has fixed this (behind a flag) but since all WebIDL attributes are implemented as own properties on the global object we need to fix bug 49739 to get non configurable properties to work correctly.

Comment 4 Erik Arvidsson 2012-04-25 14:59:33 PDT

The ES5.2 behavior is at https://bugs.ecmascript.org/show_bug.cgi?id=78

Comment 5 Erik Arvidsson 2012-08-22 06:32:45 PDT

Chrome is now shipping with this behavior.