# Window: top property



Returns a reference to the topmost window in the window hierarchy.

## Value

The reference to the topmost window.

## Notes

Where the [window.parent](https://developer.mozilla.org/en-US/docs/Web/API/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

## Browser compatibility