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Getting a window scroll in JavaScript

The following (read-only) properties contain how much the window is scrolled: 

javascriptlet x = window.pageXOffset; // from left
let y = window.pageYOffset; // from top
Задание 1

On button click, display how much the window has been scrolled vertically.

Задание 2

On button click, display how much is left until the end of the vertical scrolling.

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