Window.top
Returns a reference to the topmost window in the window hierarchy.
Syntax
var topWindow = window.top;
Notes
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.
Specifications
| Specification |
|---|
| HTML Standard (HTML) # dom-top-dev |
Browser compatibility
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
top |
1 |
12 |
1
Starting in Firefox 6, this property is read only, as defined by the standard.
|
4 |
≤12.1 |
3 |
1 |
18 |
4 |
≤12.1 |
1 |
1.0 |
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https://developer.mozilla.org/en-US/docs/Web/API/Window/top