You can create transitions with the shorthand transition property in the form of: transition: property duration transition-timing-function delay Creating transitions with the CSS transition-property Use cases for keyframe animations include loaders, which start playing as soon as the page loads and continue playing for an indefinite period of time until the requested page resource is ready to be displayed on the screen. If you plan on creating animations, which have more than a start and an end state, and you’d like to have more control over what happens in all the in-between states, then CSS keyframes will be a better fit for your project.
One more advantage of using transitions is graceful degradation: if an error occurs or a browser doesn’t support them, the worst that can happen is that the element will change its state abruptly rather than gradually. Common use cases for transitions include sliding an off-canvas sidebar in and out on hover or mouse click, changing link or button colors on hover, fading a dialog in or out in response to a button click, and the like. This means that, if your animation has only these two states, CSS transitions will be the best and simplest tool at your disposal. Transitions let you change the value of a property from its initial state to a final state in response to an event, e.g., mouseenter, mouseout, click, etc. They’re both efficient in terms of performance, especially if you animate opacity and transform properties, which browsers are very good at optimizing. You can add smooth motion effects with CSS alone, no JavaScript necessary, either with CSS transitions or CSS keyframe animations. At the end of this article, you’ll have created a morphing animation on a toggle button using CSS transitions. Here, you’ll learn when CSS transitions make a good choice for your project and how you can implement them to spruce up your website. Using CSS transitions in your frontend developer’s toolkit, you’ll be able to add flair and improve user experience on the web in as little as a line of code.
You can use it to guide web visitors’ attention, organize information and make it easier to digest, make loading content feel snappier and more entertaining, and more.
The role of web animation goes well beyond that of being a mere piece of decoration. Editor’s Note: This article was updated in September 2021 with relevant information.
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