Window: thuộc tính top
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
Returns a reference to the topmost window in the window hierarchy.
Giá trị
The reference to the topmost window.
Ghi chú
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.
Đặc tả kỹ thuật
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| HTML # dom-top-dev |