How Can I Control Website Scroll Speed Using CSS and JavaScript?

Slowing Down Scroll Speed: CSS vs. JavaScript

Problem Statement

In web development, it's desirable to control the scroll speed of website content, especially when using the mouse wheel. However, CSS alone may not suffice for this purpose.

CSS Limitations

While CSS can be used to implement certain scroll-related properties, such as overflow, it does not directly provide the ability to modify scroll speed. This is because scroll speed depends on various factors, including operating system, browser settings, and user preferences.

JavaScript Solution

To address this challenge, JavaScript or JavaScript libraries like jQuery can be employed. By manipulating the browser's scroll events, developers can alter the scroll speed, adjust scrolling behavior, and even reverse the direction of scrolling.

Practical Implementation

One such implementation is Toni Almeida's JavaScript/jQuery demo. Here's the breakdown:

HTML:

<div>

JavaScript/jQuery:

function wheel(event) {
  var delta = 0;
  if (event.wheelDelta) {
    delta = event.wheelDelta / 120;
  } else if (event.detail) {
    delta = -event.detail / 3;
  }

  handle(delta);
  if (event.preventDefault) {
    event.preventDefault();
  }
  event.returnValue = false;
}

function handle(delta) {
  var time = 1000;
  var distance = 300;

  $('html, body').stop().animate({
    scrollTop: $(window).scrollTop() - (distance * delta)
  }, time);
}

if (window.addEventListener) {
  window.addEventListener('DOMMouseScroll', wheel, false);
}
window.onmousewheel = document.onmousewheel = wheel;

This code effectively reduces the scroll speed by animating the scroll position at a slower rate. As the user scrolls, the scroll slows down and eventually stops, providing the desired control over the content's scroll behavior.

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