Document or webpage scrolling is very easy through javascript.
window.scrollBy(10,20); // horizontal and vertical scroll increments or decrements.

Using scrollBy function you can create custom event or function based on project requirement.

Here I am giving you the sample code: Up scrolling and down scrolling

//For Upscrolling:

function ScrollUp() {
window.scrollBy(0,100);
}

//For Down scrolling:
function ScrollDown() {
window.scrollBy(0,-100);
}

In same way you can create your own functions.

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• javascript scroll page up

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