Funny... IE9 shows true, but only when there's a valid doctype :)
-----Original Message-----
From: Boris Zbarsky
Sent: Monday, April 04, 2011 12:58 AM
To: Alexandre Morgaut
Cc: [email protected]
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...
(As any Javascript code could use a global variable with the same
name/id)
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):
<body>
<div id="valueOf">aaa</div>
<script>alert(window.valueOf == Object.prototype.valueOf)</script>
</body>
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....
-Boris
