It is built with CSS which provide smooth animation which can be applied to text or images. This codepen shows an example of CSS transition: I transition the background color from yellow to purple over 1 second on hover. So my two states are “default” to “hover”. 1. is one iteration of the animation.. svg { position: fixed; /* make sure it stays put so we can see it! ~ 1. It is a lightweight plugin and the classes on HTML elements based on the scroll position. However, proposals akin to this one hold the promise of further offloading scroll-linked animation work to the browser. If you want to improve this demo, here are two things you might want to try: - Enable the animations only on large screens. animate based on scroll position – either trigger an animation or synchronize it to the scrollbar movement (like a playback scrub control). toggle CSS classes of elements on and off based on scroll position. Enabling smooth scrolling is really easy, it you can enable it using a single line of CSS: html { scroll-behavior: smooth; } Yes, that’s it! In a nutshell, for scroll-linked animations, use CSS properties where possible, but where necessary, use the proper optimizations in Javascript: for discrete events based on position, use the observer pattern. ## Conclusion In this quick tip, we learned how we can combine the fullpage.js and animate.css libraries to build scroll-based animations. Like you scroll to a point, it triggers some animation, which moves some element such that it changes the scroll position, which stops the animation, which moves the scroll position again… etc. Animations are set using the data-aos ... Scroll-triggered animations such as block reveal effects … We also made use of the will-change property, which allows us to hint to the browser which properties are going to be animated. Takeaways. https://fabriceleven.com/dev/create-animations-on-page-scroll Using CSS transitions. Level up your CSS animation skills! CSS transitions usually need a trigger, but you are not limited to :hover. We will be able to use this any time we want to trigger animations on an element on scroll. I have several div classes on the page that are using different animations. Now let’s pause this animation. Smooth Scrolling. In order to activate a CSS animation, a class needs to be added to the element when this becomes visible. Here comes the trick! View it on CodePen. In the demo embedded below, click any of the links in the nav and see how smooth it scrolls: Rather than animate it over a time period, we’ll animate it via the scroll position by adjusting the animation-delayas the page scrolls.If the animation-duration is 1s, that means scrolling the whole length of the page. The animation for each div have been already added on the CSS sheet and I just need to understand how to trigger these animated classes if the element appears on viewport. See the Pen CSS Animations on Scroll – Slide in From Left by SitePoint on CodePen. “Scroll-position styling” seems like it would have the widest appeal and use level of usefulness. Smooth Scrolling Sticky ScrollSpy Navigation (base layer) by Bramus on CodePen. pin an element starting at a specific scroll position – either indefinitely or for a limited amount of scroll progress (sticky elements). As other answers have indicated, JS is required for this and Waypoints is a JS script that can be used.. Waypoints is the easiest way to trigger a function when you scroll to an element. The ScrollTrigger is a library which triggers the element on the scroll. So I would like add a class when the element appears on the viewport. I also wonder why it’s all specific to animation. 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