How to call parent window function from child window jquery?

Use this

window.parent.CallParent();

instead of

window.opener.CallParent();

window.parent holds a reference to the parent of the current window or subframe.

If a window does not have a parent, its parent property is a reference to itself.

When a window is loaded in an <iframe>, <object>, or <frame>, its parent is the window with the element embedding the window.

Reference: https://developer.mozilla.org/en-US/docs/Web/API/Window/parent

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