# Getting and changing a window scroll in JavaScript

The following properties contain how much the window is scrolled:

`let t = document.documentElement.scrollTop; // from top let l = document.documentElement.scrollLeft; // from left`

These properties can be changed to scroll the window to an arbitrary position:

`document.documentElement.scrollTop = 200;`

By clicking on the button, scroll the window to the position `300px` from the top.

By clicking on the button, scroll the window to the position `100px` from the bottom.

On button click, scroll the window to the very top.

On button click, scroll the window to the very bottom.

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