[whatwg] [WHATWG] HTMLElement ids as global object properties
Randy at ProWebDesign.nl
Mon Apr 4 00:34:14 PDT 2011
Funny... IE9 shows true, but only when there's a valid doctype :)
From: Boris Zbarsky
Sent: Monday, April 04, 2011 12:58 AM
To: Alexandre Morgaut
Cc: whatwg at lists.whatwg.org
Subject: Re: [whatwg] [WHATWG] HTMLElement ids as global object properties
On 4/3/11 12:53 PM, Alexandre Morgaut wrote:
>> The id lookup happens after all other property resolution in browsers
>> (but NOT in the current spec text, note), so if you had<div
>> id="location"> and accessed window.location you would get a Location
>> object, not the<div>.
> So you can not rely on being able to access an HTMLElement from its id
> this way...
Or a future spec revision could add a new property on Window.prototype.
Or on Object.prototype. Try this testcase (the lack of a doctype is
important in Gecko's case):
<script>alert(window.valueOf == Object.prototype.valueOf)</script>
This alerts false in Opera, but true in Gecko, Safari, Chrome. I don't
have IE on hand to test right now.
So yes, this is a very fragile way of accessing elements.
> Is there any registered bug on Opera and Webkit about this topic ?
I'm not aware of any....
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