Returns a reference to the topmost window in the window hierarchy.
var topWindow = window.top;
Where the window.parent property returns the immediate parent of the current window, window.top returns the topmost window in the hierarchy of window objects.
This property is especially useful when you are dealing with a window that is in a subframe of a parent or parents, and you want to get to the top-level frameset.
| Specification | Status | Comment |
|---|---|---|
| HTML Living Standard The definition of 'window.top' in that specification. | Living Standard | |
| HTML5 The definition of 'window.top' in that specification. | Recommendation | Initial definition |
| Feature | Chrome | Edge | Firefox (Gecko) | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|---|
| Basic support | (Yes) | (Yes) | (Yes)[1] | (Yes) | (Yes) | (Yes) |
| Feature | Android | Edge | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|---|
| Basic support | ? | (Yes) | ? | ? | ? | ? |
[1] Starting in Gecko 6.0 (Firefox 6.0 / Thunderbird 6.0 / SeaMonkey 2.3), this property is read only, as defined by the standard.
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https://developer.mozilla.org/en-US/docs/Web/API/window/top