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css-animations

Seek CSS animations deterministically via the css adapter in HyperFrames.

40.2k|3.8k|Updated Mar 10, 2026
Search Tags:#css#timing#web-design#css-animations#hyperframes#animation-seeking#visual-motion
One-click install
npx skills add https://github.com/heygen-com/hyperframes --skill css-animations-heygen-com
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: css-animations
Source: https://github.com/heygen-com/hyperframes/tree/main/skills/css-animations
Command: npx skills add https://github.com/heygen-com/hyperframes --skill css-animations-heygen-com

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

CSS animations can be inconsistent across previews and renders because timing is controlled by the browser. HyperFrames can seek CSS keyframes through the css runtime adapter to reproduce motion deterministically in video compositions.

Core Features & Use Cases

  • Seek CSS animations via the css runtime adapter to align motion with the clip timeline.
  • Use finite animation durations and data-start values to ensure deterministic playback of decorative effects (shimmer, glow, masks).
  • Ideal for single-element entrances or subtle motion where a full JavaScript timeline would be overkill.

Quick Start

Place the animated element in the DOM before runtime initializes, give it a finite animation-duration, and set a data-start value to synchronize with the clip.

Frequently Asked Questions about css-animations

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I synchronize CSS animations with a video timeline during rendering?▼

To synchronize CSS animations with a video timeline, use a css runtime adapter to seek keyframes deterministically. This ensures decorative motions align precisely with clip previews and renders instead of relying on browser-controlled timing.

Why does my CSS animation play inconsistently between preview and final render?▼

CSS animations play inconsistently because browser-controlled timing varies during rendering. Applying a css adapter with finite animation-duration and explicit data-start values forces deterministic seeking to reproduce exact motion across outputs.

What are the requirements for deterministic CSS animation seeking?▼

Deterministic seeking requires the animated element to be present in the DOM before runtime, a finite animation-duration, and an explicit data-start value. These ensure the css adapter can accurately synchronize motion with the clip timeline.

When should I use CSS animations instead of a JavaScript timeline?▼

Use CSS animations for single-element entrances or subtle decorative motion like shimmer and glow effects. A full JavaScript timeline is unnecessary for these fixed-duration, timing-bound motions on single elements during video composition.

Can I use infinite CSS animation loops for video rendering?▼

Infinite CSS animation loops are not suitable for deterministic video rendering. The css adapter requires a finite animation-duration to seek the animation accurately and align the motion with the clip timeline.

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