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Re: [whatwg] Configurability of document.domain

From: Ian Hickson <ian@hixie.ch>
Date: Fri, 6 Dec 2013 19:35:39 +0000 (UTC)
To: Boris Zbarsky <bzbarsky@MIT.EDU>, Anne van Kesteren <annevk@annevk.nl>
Message-ID: <alpine.DEB.2.00.1312061934530.27766@ps20323.dreamhostps.com>
Cc: whatwg@lists.whatwg.org
On Thu, 21 Nov 2013, Boris Zbarsky wrote:
> On 11/21/13 6:28 AM, Anne van Kesteren wrote:
> > IE10 has configurable set to false too.
> 
> IE's behavior here makes no sense.  The property is set non-configurable, but
> it's on the prototype, not on the object itself. So this testcase:
> 
>   alert(Object.getOwnPropertyDescriptor(Document.prototype,
> "domain").configurable);
>   Object.defineProperty(document, "domain", { value: 5 });
>   alert(document.domain);
> 
> alerts "false" and then "5" in the IE11 preview, for example.
> 
> Either the property should be unforgeable (and then live on the document
> object itself and be non-configurable), or it should be on the proto and
> configurable (because it can be shadowed anyway, so no point in disallowing
> configurability).
> 
> > So we have Safari/IE10 vs Firefox/Chrome.
> 
> The Safari and IE behaviors are quite different here.
> 
> As are the Firefox/Chrome behaviors, actually (in Firefox it's a configurable
> accessor on the prototype, but in Chrome it's a configurable value property on
> the object itself)...
> 
> 4 browsers, 4 different behaviors, yay.  ;)

Given the lack of interop here, and the way the majority of browsers in 
practice let it be overridden (suggesting there's no compat need, and 
likely no obvious security need), I've left the spec as-is for now.

-- 
Ian Hickson               U+1047E                )\._.,--....,'``.    fL
http://ln.hixie.ch/       U+263A                /,   _.. \   _\  ;`._ ,.
Things that are impossible just take longer.   `._.-(,_..'--(,_..'`-.;.'
Received on Friday, 6 December 2013 19:36:03 UTC

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