Teaching the use of scroll-timeline in CSS

Introduction to the concept of scroll-timeline in CSS

In the world of web design, sometimes new and attractive features are added to enhance user experience. One of these new features in CSS is something called scroll-timeline. This feature allows you to interact directly with the scrolling of the web page and implement animations based on the scroll position of the element. This can be a very powerful tool for creating engaging and appealing interactions on web pages.

In general, scroll-timeline gives you the ability to use the scroll position of the page as an entry to execute various animations such as sliders, displays, or controlling fine changes. Considering the growing popularity of scrolling in web designs, this feature can truly evolve in this area.

Until now, for implementing this kind of interactions, it usually required the use of JavaScript and complex code writing. However, now, CSS has facilitated this process by providing the scroll-timeline feature.

Another significant benefit that this feature offers to developers is that it can indicate performance aspects, why this feature is completely rooted in CSS, and can prevent additional JavaScript execution. This facilitation can improve the speed and performance of the page.

How to use scroll-timeline

To use this feature, you first need to define a timeline that from it, will be used as an entry for animations. For example, you can define a scroll-timeline named delightful design and then connect it to your animations. Below, we will look at an example code to get familiar with the implementation method.

@scroll-timeline my-timeline {
  time-range: auto;
}

.div {
  animation: my-animation 1s linear infinite;
  animation-timeline: my-timeline;
}

Now that we have encountered a sample code, let’s examine line by line this example:

@scroll-timeline my-timeline
In this line, a timeline named my-timeline is defined, which will soon be used for animations.

time-range: auto;
This property automatically determines the time frame based on the content's elevation.

.div
: The HTML element that contains the animations.

animation: my-animation 1s linear infinite;
The animation is defined with a duration of 1 second and repeats continuously.

animation-timeline: my-timeline;
The defined animation is linked to the scroll-timeline.