anton-abyzovanton-abyzov/vskill/.claude/skills/waapi/SKILL.md

waapi

Skill48 starsChanged 6 months agoMITView on GitHub

Web Animations API adapter patterns for HyperFrames. Use when authoring element.animate() motion, Animation currentTime seeking, document.getAnimations(), KeyframeEffect timing, fill modes, or native browser animations that must render deterministically in HyperFrames.

We split this skill into the rules it gives an agent

5 rules. 3 are common, 0 are distinctive, and 2 are very specific to this project.

3
Common
Most of the 6 edited versions we read keep these.
0
Distinctive
This author's own choices. Worth a look.
2
Very specific
Tied to their project's names, files or tools. Probably skip.

Common
Distinctive
Very specific

Common:
Create animations synchronously during composition initialization.
line 13
Very specific:
Use element.animate(...) with finite duration and iterations.
line 14
Very specific:
Use fill: "both" so seeked states persist.
line 15
Common:
Avoid callbacks and promises for render-critical state.
line 17
Common:
After editing a WAAPI composition:
line 84

“Common” is measured: kept by at least 6 in 10 of the 6 edited versions of this file we could read. “Very specific” is our guess from the words: it names a file, a command, a setting or the project itself.

Keep what fits and drop the rest. Your version, ready for your agents.

Files

SKILL.md

Web Animations API for HyperFrames

HyperFrames can seek Web Animations API animations through its waapi runtime adapter. WAAPI is useful when you want native browser keyframes with JavaScript-created timing and no GSAP dependency.

Contract

Create animations synchronously during composition initialization.
Use element.animate(...) with finite duration and iterations.
Use fill: "both" so seeked states persist.
Pause animations after creation or let the adapter pause them on first seek.
Avoid callbacks and promises for render-critical state.

The adapter calls document.getAnimations(), sets each animation's currentTime to HyperFrames time in milliseconds, then pauses it.

Basic Pattern

<div id="orb" class="clip orb" data-start="2" data-duration="3" data-track-index="2"></div>

<script>
  const orb = document.getElementById("orb");
  const animation = orb.animate(
    [
      { transform: "translate3d(-160px, 0, 0) scale(0.8)", opacity: 0 },
      { transform: "translate3d(0, 0, 0) scale(1)", opacity: 1, offset: 0.35 },
      { transform: "translate3d(120px, 0, 0) scale(1.08)", opacity: 1 },
    ],
    {
      duration: 3000,
      delay: 2000,
      easing: "cubic-bezier(0.2, 0, 0, 1)",
      fill: "both",
      iterations: 1,
    },
  );

  animation.pause();
</script>

Stagger Pattern

document.querySelectorAll(".token").forEach((token, index) => {
  const animation = token.animate(
    [
      { transform: "translateY(24px)", opacity: 0 },
      { transform: "translateY(0)", opacity: 1 },
    ],
    {
      duration: 620,
      delay: index * 80,
      easing: "cubic-bezier(0.2, 0, 0, 1)",
      fill: "both",
      iterations: 1,
    },
  );
  animation.pause();
});

Good Uses

Lightweight DOM motion where CSS keyframes are too rigid and GSAP is unnecessary.
Generated animations from structured data.
Simple timelines that can be represented as keyframes, delays, and offsets.

Avoid

Infinite iterations.
Depending on animation.finished to mutate render-critical DOM.
Running separate clocks with requestAnimationFrame, timers, or performance.now().
Animating layout properties when transforms and opacity can express the motion.
Assuming clip-local start time is automatic. WAAPI adapter seeks document-level animation time; model clip offsets with delay or create the animation on an element whose visibility is controlled by HyperFrames timing.

Validation

After editing a WAAPI composition:

npx hyperframes lint
npx hyperframes validate

Credits And References

HyperFrames adapter source: packages/core/src/runtime/adapters/waapi.ts.
MDN Web Animations API guide: https://developer.mozilla.org/docs/Web/API/Web_Animations_API/Using_the_Web_Animations_API
MDN Animation.currentTime: https://developer.mozilla.org/en-US/docs/Web/API/Animation/currentTime

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Other versions6 projects use a version of this.
Word for word · 0
None found.
Edited · 6
boraoztunc/skills★ 337100% same
delorenj/skills★ 18100% same
hoanghd218/claude-code-2-days★ 8100% same
Biznomad/claude-skills★ 0100% same
Fldicoahkiin/WalDrive★ 0100% same
florattu/claude-skills★ 0100% same
Wrote their own version · 0
None found.
How matches are found. Word for word: the exact same text. Edited: shares passages with this file (“99% same” means 99% of its five-word phrases also appear here; 10% or more counts). Their own version: similar meaning, or, weakest, the same name. We can’t tell which project had it first. Projects are counted among the 200 most-starred candidates, and mentions are links to the repository we found, up to 50 per site, so both counts are a floor.
Used alongsideProjects with it also use contribute-catalog, typegpu and 2 more.
Other files people use alongside this one.
- FldicoahkiinSkill
  contribute-catalog
  Author a new HyperFrames registry block (caption style, VFX block, transition, lower third) or component (text effect, overlay, snippet) and ship it as an upstream PR to the hyperframes repo. Use ONLY when the user wants to CONTRIBUTE to the public catalog — for in-project caption/transition authoring use the `hyperframes` skill, for installing existing registry items use the `hyperframes-registry` skill.
  Also in 3 projects that use this
- software-mansion-labsSkill
  typegpu
  TypeGPU is type-safe WebGPU in TypeScript. Use whenever the user writes, debugs, or designs TypeGPU code: 'use gpu' shader functions, tgpu.fn, buffers, textures, bind groups, compute and render pipelines, command encoders, render passes, render bundles, vertex layouts, slots, accessors, @typegpu/react hooks (useRoot, useFrame, useUniform), React Native worklet rendering, and any TypeGPU API. Shader logic and CPU-side resources are tightly coupled - handle both sides here even if the user only mentions one (e.g. "how do I write a shader", "how do I create a buffer"). Trigger on any mention of typegpu, tgpu, "use gpu", TypedGPU, or WebGPU code written using TypeGPU's schema API (d.*, tgpu.*, std.*). Do NOT trigger for raw WebGPU (using GPUDevice/GPURenderPipeline directly without tgpu), WGSL-only questions, Three.js, Babylon.js, or WebGL.
  Also in 3 projects that use this
- MicrosoftSkill
  impeccable
  Use when the user wants to design, redesign, shape, critique, audit, polish, simplify, harden, animate, or otherwise improve a frontend interface: websites, landing pages, dashboards, product UI, components, forms, settings, onboarding, empty states, and native iOS or Android screens. Handles UX review, hierarchy, layout, typography, color, motion, UX copy, accessibility, responsive behavior, edge cases, and capturing or documenting design systems (DESIGN.md, tokens). Also for making bland UI bolder, loud UI quieter, or ambitious visual effects. Not for backend-only or non-UI tasks.
  Also in 3 projects that use this
- BlockSkill
  frontend-design
  Create distinctive, production-grade frontend interfaces with high design quality. Use this skill when the user asks to build web components, pages, or applications. Generates creative, polished code that avoids generic AI aesthetics.
  Also in 3 projects that use this
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5 rules. 3 are common, 0 are distinctive, and 2 are very specific to this project.

Web Animations API for HyperFrames

Contract

Basic Pattern

Stagger Pattern

Good Uses

Avoid

Validation

Credits And References

Word for word · 0

Edited · 6

Wrote their own version · 0

contribute-catalog

typegpu

impeccable

frontend-design

Does it work?

Your trail

Now do this for your own.