CSS animation-fill-mode Property

The CSS animation-fill-mode property sets how an animation applies styles to its target before and after execution. As part of the Transform & Animation module in CSS, it is one of the most commonly used properties for controlling the visual presentation of web pages.

You can set animation-fill-mode to values such as none, forwards, backwards, both, among others. Each value changes how the browser renders the affected element, giving you fine-grained control over your page layout and design. Choosing the right value depends on the specific design requirements of your project.

Common use cases for the animation-fill-mode property include responsive web design, component-based layouts, and creating visually consistent interfaces across devices. It works closely with related properties like animation, animation-direction, animation-delay to achieve complex styling effects. Understanding how these properties interact helps you write cleaner, more maintainable stylesheets.

Browser support for animation-fill-mode is excellent across all modern browsers including Chrome, Firefox, Safari, and Edge. For older browsers, consider using fallback values or progressive enhancement strategies. The property can also be set dynamically via JavaScript using element.style.animationFillMode or the CSS custom properties (variables) approach for theming.