Why is window not identical to window.self in Internet Explorer?

Posted by Jim Puls on Stack Overflow See other posts from Stack Overflow or by Jim Puls
Published on 2010-04-27T21:13:05Z Indexed on 2010/04/27 21:13 UTC
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Filed under:

JavaScript

|

dom

|

cross-browser

There's a convoluted backstory involving how I came across this, but why is the self property not exactly equal to the window itself?

In Safari and Firefox and friends, the results are as I'd expect:

> window == window.self
  true
> window === window.self
  true

The same isn't true in Internet Explorer, though:

>> window == window.self
   true
>> window === window.self
   false

Can anybody account for the inconsistency? To exactly what is the self property of the window object pointing? It casts to something with equality, which is even more vexing.

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