javascript - window.top === window false condition in IE8 - Stack Overflow

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For some reason, using the

window.top === window

condition in IE8 always evaluates to false (in other browsers it works fine). What is the reason for this, and is there any other way for this condition to work cross-browser?

Thanks,

Joel

For some reason, using the

window.top === window

condition in IE8 always evaluates to false (in other browsers it works fine). What is the reason for this, and is there any other way for this condition to work cross-browser?

Thanks,

Joel

• javascript
• jquery

Share Improve this question Follow asked Feb 13, 2011 at 12:35 JoelJoel 6,1071212 gold badges4444 silver badges5959 bronze badges 2

• ...and definitely not within a frame? :P – alex Commented Feb 13, 2011 at 12:37
• @alex - yup... i am using this code inside a page that is sometimes served inside an iframe. I need to check if it is the top window or an iframe – Joel Commented Feb 13, 2011 at 12:43

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Sorted by: Reset to default 13

It's a very plicated topic, but the short version is, use == when paring windows, not ===, because of the "internal" vs. "external" reference aspect of it. You'll find that (for instance) window === self is false on some browsers.

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