[Webkit-unassigned] [Bug 126522] New: Named object access properties should be configurable or don't exist at all

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=126522

           Summary: Named object access properties should be configurable
                    or don't exist at all
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
               URL: https://github.com/ajaxorg/ace/issues/1741
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: hartman.wiki at gmail.com


This is about the side effects of http://www.w3.org/TR/html5/browsers.html#named-access-on-the-window-object

It seems the properties that this named access creates on the window object are non-configureable. This makes it 'randomly'/'DOM dependent' impossible to create properties on the window object. Apparently Safari is the only browser that has them unconfigurable and the only browser that has them defined as actually properties. There might be a good reason for this (security ?). However, it's annoying, especially for JS libraries that might be deployed. This impredictability of which properties on your window object are defined makes this a nuisance to developers and more so. I think this should be changed.

I ran into this problem here: https://github.com/ajaxorg/ace/issues/1741


Additionally specific to Safari, this seems to create a problem with local declared but uninitialized variables, which might be even more problematic. This problem is detailed in the console.log example in http://dertompson.com/2013/08/07/named-access-on-the-window-object-in-safari/
This might give a scripter unintentional and obscured access to these named objects causing unpredictable results.

Further background reading materials:
http://tjvantoll.com/2012/07/19/dom-element-references-as-global-variables/
https://www.w3.org/Bugs/Public/show_bug.cgi?id=11960

-- 
Configure bugmail: https://bugs.webkit.org/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
You are the assignee for the bug.