Creating Animation Based on Timeline

Hello friends! Today we want to discuss an interesting topic in the world of CSS animations. You might find it interesting that you can use timeline view to create engaging animations for different elements. This concept is relatively new and provides many possibilities for creative and interactive designs.

By using this capability, you can easily create animations based on user interactions on the active or inactive page. Let's assume you want to animate an element when the user scrolls to a particular point; this technique allows you to utilize timeline views.

To achieve this goal, you need to understand how various CSS states work, such as 'scroll-timeline'. This feature allows you to create an animation based on the position or state of the user during the control page.

Additionally, you can combine this technique with @keyframes to create more complex animations. This combination allows you to modify, for example, color changes or dimensions simultaneously with changes in the positioning of elements on the control page.

Below is a simple code example of this state demonstrating how you can easily combine animations using JavaScript, HTML, and CSS to implement scrolling animations.

<!-- HTML Code -->
<div class="animate-me">Hello, World!</div>

<!-- CSS -->
@keyframes scrollAnimation {
    0% {
        transform: translateY(0);
    }
    100% {
        transform: translateY(100px);
    }
}

.animate-me {
    animation: scrollAnimation 1s ease-out forwards;
    animation-timeline: scroll-timeline auto;
    scroll-timeline-name: timeline;
    scroll-timeline-axis: y;
}

/* JavaScript to link the animation with a scrolled timeline */
const observer = new IntersectionObserver(entries => {
    entries.forEach(entry => {
        if (entry.isIntersecting) {
            entry.target.style.animationPlayState = 'running';
        } else {
            entry.target.style.animationPlayState = 'paused';
        }
    });
});

document.querySelectorAll('.animate-me').forEach(el => observer.observe(el));

Explanation line by line

<div class="animate-me">Hello, World!</div> - This element is intended to animate. We assign it a class called 'animate-me' to make it the target of our animation.

@keyframes scrollAnimation - Here we define a keyframe animation that determines how the element will change during the animation duration.

.animate-me - This CSS rule is related to the element with the class 'animate-me', which will execute the animation.

In the JavaScript section, we use IntersectionObserver to detect when the element is visible and accordingly start or pause the animation.