Layered Motion for Stateful Interfaces

The Web Animations API provides a programmatic way to define and control animations directly in the browser. Instead of relying on CSS keyframes or third-party libraries, animations are expressed as first-class JavaScript objects with explicit timing and playback control.

Why

As interfaces become more dynamic, animation often represents state rather than decoration. The Web Animations API makes it easier to coordinate motion across multiple elements, respond to user input, and keep animation logic colocated with application state.

When

I use the Web Animations API in established products where motion is part of the interaction model, such as layered visuals, gesture-driven interfaces, or UI elements that need fine-grained control over timing, direction, or synchronization.

Example

Three layered SVG waves moving continuously at different speeds, creating a seamless parallax effect where each layer is animated independently.

Trade-offs

The API is more verbose than CSS animations and can feel heavy for simple effects. It is best suited for cases where animation behavior needs to be dynamic, state-aware, or tightly controlled.