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tsup.config.ts	tsup.config.ts
vitest.config.ts	vitest.config.ts

@hyperframes/player

Embeddable web component for playing HyperFrames compositions. Zero dependencies, works with any framework.

Install

npm install @hyperframes/player

Or load directly via CDN:

<script type="module" src="https://cdn.jsdelivr.net/npm/@hyperframes/player"></script>

If you need a classic <script> tag instead of ESM, use the explicit global build:

<script src="https://cdn.jsdelivr.net/npm/@hyperframes/player/dist/hyperframes-player.global.js"></script>

Usage

<hyperframes-player src="./my-composition/index.html" controls></hyperframes-player>

The player loads the composition in a sandboxed iframe, auto-detects its dimensions and duration, and scales it responsively to fit the container.

With a framework

import "@hyperframes/player";

// The custom element is now registered — use it in your markup
// React: <hyperframes-player src="..." controls />
// Vue:   <hyperframes-player :src="url" controls />

Video files

Set type to a video type and the player plays src in a <video playsinline> instead of loading it as a composition. The same API and events apply: play(), pause(), seek(), currentTime, duration, ready, timeupdate, play, pause, ended, durationchange and resize, with the video's own size as compositionWidth/compositionHeight. A video that fails to load fires error at once with { message, code }, where code is the MediaError code. A play() the browser blocks (for example, unmuted autoplay) fires playbackerror with { source: "video" } and leaves the player paused. poster, controls, loop, muted, volume, playback-rate and autoplay work as they do for a composition. scenes, setRuntimeData(), setColorGrading(), iframeElement and stopMedia() are composition-only: a video has no scenes or runtime, its iframe stays blank, and stopMedia() does not stop the video. srcdoc wins over a video src, as it does in an iframe.

<hyperframes-player
  type="video/mp4"
  src="./render.mp4"
  poster="./poster.jpg"
  controls
></hyperframes-player>

Poster image

Show a static image before playback starts:

<hyperframes-player
  src="./composition/index.html"
  poster="./thumbnail.jpg"
  controls
></hyperframes-player>

Attributes

Attribute	Type	Default	Description
`src`	string	—	URL to the composition HTML file, or to a video file with `type`
`type`	string	—	A `video/...` type (e.g. `video/mp4`) plays `src` as a video file
`audio-src`	string	—	Audio URL for parent-frame playback (mobile)
`width`	number	1920	Composition width in pixels (aspect ratio)
`height`	number	1080	Composition height in pixels (aspect ratio)
`controls`	boolean	false	Show play/pause, scrubber, and time display
`muted`	boolean	false	Mute audio playback
`audio-locked`	boolean	false	Force-mute and hide the volume controls so the viewer cannot turn sound on
`poster`	string	—	Image URL shown before playback starts
`playback-rate`	number	1	Speed multiplier (0.5 = half, 2 = double)
`autoplay`	boolean	false	Start playing when ready
`loop`	boolean	false	Restart when the composition ends
`shader-capture-scale`	number	—	Shader transition snapshot scale forwarded to browser previews (`0.25`-`1`)
`shader-loading`	`composition \| player \| none`	`composition`	Controls shader transition prep loading UI ownership
`assets-loading-ui`	`player \| none`	`player`	`none` never shows the loading-assets card; asset events still fire
`low-power-idle`	boolean	false	While paused, check in once a second, not every 80 ms (many-player pages)
`disable-click-to-play`	boolean	false	A click on the player no longer plays or pauses (host overlays own clicks)
`range-start`	number	—	Film second where playback starts, loops back to and parks when paused
`range-end`	number	—	Film second the range ends before: it stops or loops on the frame before it

range-start and range-end play the moment [start, end) of the film. The player parks on range-start at ready, and again when a paused playhead falls outside a new range; play() from outside the range starts there. At the end it holds the last frame before range-end and fires ended, or wraps to range-start with loop. A current runtime stops on that frame itself; video and __timelines players stop on their next clock tick and step back to it; an older runtime stops when the player sees its time pass the end. currentTime and duration stay in film time. A range past the film is cut to its end and an empty or negative one is ignored; both fire rangeclamped.

Shader transition previews

When a composition uses @hyperframes/shader-transitions, the player can own preview-only shader capture settings:

<hyperframes-player
  src="./composition/index.html"
  shader-capture-scale="1"
  shader-loading="player"
  controls
></hyperframes-player>

shader-loading="player" shows the player-owned transition-prep overlay from shader progress messages. composition leaves direct composition fallback behavior alone, and none suppresses the loader.

Loading-assets card

While images, video or fonts are still loading after ready, the player shows a loading card over the frame and sets the assets-loading attribute on itself. A host that draws its own loading state can turn the card off with assets-loading-ui="none" (or player.assetsLoadingUi = "none"). The assets-loading attribute and the assetsready and painted events behave the same either way, so the host still knows when the frame is ready.

Audio lock (host-mandated silent playback)

audio-locked forces muted on and hides the volume controls, with no UI path for the viewer to turn sound back on. Use it when embedding in a chat host (Claude.ai, ChatGPT, etc.) where audio must stay off regardless of viewer intent. Setting muted directly is not enough — viewers can flip it back via the controls bar.

Removing audio-locked only unhides the controls; it does not auto-unmute. Callers manage muted explicitly after unlocking.

Host-environment fallback. Some host renderers — notably the Claude desktop Electron client — strip unknown custom-element attributes before they reach the DOM, defeating the attribute. As a safety net, the player also self-imposes the lock when it detects such an environment via navigator.userAgent, so audio stays muted even if the attribute never arrives. The public audioLocked property still reflects only the attribute, so external consumers (e.g. host widgets that mirror state) are not affected by the fallback.

Mobile audio

Mobile browsers block audio.play() inside iframes when the user gesture happened in the parent frame (the User Activation spec does not propagate activation across frame boundaries via postMessage).

The player handles this automatically for same-origin iframes (the default — sandbox includes allow-same-origin):

When the composition is ready, the player extracts all timed media (audio[data-start], video[data-start]) from the iframe DOM and creates parent-frame copies.
The iframe originals are disabled (src and data-start removed) so the runtime doesn't try to play them.
When play() is called (from a user gesture), parent media .play() runs synchronously in the gesture call stack, satisfying mobile autoplay policy.
Both parent media and the GSAP timeline start simultaneously and free-run — no active sync needed since both are real-time systems.

No changes are required by consumers — this works out of the box.

The optional audio-src attribute can be used to start preloading a primary audio track before the iframe loads (useful on slow connections), but is not required for mobile playback.

JavaScript API

const player = document.querySelector("hyperframes-player");

// Playback
player.play();
player.pause();
player.seek(2.5); // jump to 2.5 seconds

// Properties
player.currentTime; // number (read/write)
player.duration; // number (read-only)
player.paused; // boolean (read-only)
player.ready; // boolean (read-only)
player.compositionWidth; // number (read-only), the composition's width
player.compositionHeight; // number (read-only), the composition's height
player.disableClickToPlay; // boolean (read/write)
player.playbackRate; // number (read/write)
player.muted; // boolean (read/write)
player.audioLocked; // boolean (read/write) — force-mute + hide volume controls
player.loop; // boolean (read/write)
player.rangeStart; // number | null (read/write, mirrors range-start)
player.rangeEnd; // number | null (read/write, mirrors range-end)
player.shaderCaptureScale; // number (read/write)
player.shaderLoading; // "composition" | "player" | "none" (read/write)

// Inner iframe access (for advanced consumers — see "Advanced: iframe access" below)
player.iframeElement; // HTMLIFrameElement (read-only)

Runtime data delivery

setRuntimeData(channel, payload) clones and retains the payload, then delivers it after the composition runtime is ready. Invalid channels and non-cloneable payloads throw synchronously. Failures after the call returns are reported with runtimedataerror; successful application is reported with runtimedataapplied. Both events include { channel, requestId }, and errors also include message. Listen for both outcomes when delivery matters:

player.addEventListener("runtimedataapplied", ({ detail }) => {
  console.log("applied", detail.channel, detail.requestId);
});
player.addEventListener("runtimedataerror", ({ detail }) => {
  console.error("not applied", detail.channel, detail.requestId, detail.message);
});
player.setRuntimeData("captions", captionData);

Only the latest in-flight update for a channel can emit a completion. A missing runtime response, iframe teardown, or bridge delivery failure emits runtimedataerror instead of remaining pending indefinitely.

Advanced: iframe access

The composition runs inside a sandboxed <iframe> in the player's Shadow DOM. The default sandbox includes allow-same-origin for editor, recorder, and custom-timeline integrations that inspect the composition DOM. That is a trusted-content mode, not an isolation boundary: same-origin composition code can reach the embedding page.

For read-only or message-bridge integrations, set sandbox-origin="opaque". Any non-null value is treated as opaque so a typo cannot weaken isolation. Changing the attribute reloads the active composition because browser sandbox changes take effect only on navigation. Opaque mode removes allow-same-origin while retaining scripts, and prevents the composition from reading unrelated parent DOM. Direct contentDocument, __player, and __timelines access is intentionally unavailable in that mode.

If you are building a trusted editor integration that needs direct access, use the iframeElement getter:

const player = document.querySelector("hyperframes-player");
const iframe = player.iframeElement;

// Now you can reach into the composition's DOM and runtime
iframe.contentDocument.querySelectorAll("[data-composition-id]");
iframe.contentWindow.__timelines;

This is the canonical way to bridge the player into tools like @hyperframes/studio. The studio exports a resolveIframe helper that works with both iframe refs and web-component refs:

import { useTimelinePlayer, resolveIframe } from "@hyperframes/studio";

const { iframeRef } = useTimelinePlayer();
const player = document.createElement("hyperframes-player");
player.setAttribute("src", src);
container.appendChild(player);

// Forward the inner iframe so useTimelinePlayer can drive play/pause/seek.
iframeRef.current = resolveIframe(player);

React: declarative ref pattern

If you prefer JSX over imperative element creation, attach a ref directly to the web component and resolve the iframe inside an effect:

import "@hyperframes/player";
import type { HyperframesPlayer } from "@hyperframes/player";
import { useTimelinePlayer, resolveIframe } from "@hyperframes/studio";

function StudioPreview({ src }: { src: string }) {
  const { iframeRef, onIframeLoad } = useTimelinePlayer();
  const playerRef = useRef<HyperframesPlayer>(null);

  useEffect(() => {
    iframeRef.current = resolveIframe(playerRef.current);
  });

  return <hyperframes-player ref={playerRef} src={src} onLoad={onIframeLoad} />;
}

Heads up — common gotcha

If you pass the <hyperframes-player> element itself (not iframeElement) into a hook that expects an <iframe>, every .contentWindow / .contentDocument access returns null because the iframe lives inside the player's Shadow DOM. Always extract iframeElement first, or use resolveIframe from @hyperframes/studio which handles both iframe and web-component hosts transparently.

Events

Event	Detail	Fired when
`ready`	`{ duration, compositionWidth, compositionHeight }`	Composition loaded and duration determined
`durationchange`	`{ duration }`	The duration changed after `ready`
`resize`	`{ compositionWidth, compositionHeight }`	The composition's size changed
`play`	—	Playback started
`pause`	—	Playback paused
`timeupdate`	`{ currentTime }`	Playback position changed (~10 fps)
`ended`	—	Reached the end (when not looping)
`rangeclamped`	`{ rangeStart, rangeEnd, duration }`	The range was cut to the film, or ignored
`error`	`{ message }` (video mode: `{ message, code }`)	Composition or video failed to load
`playbackerror`	`{ source, error }`	The browser blocked playback
`shadertransitionstate`	`{ compositionId, state }`	Shader transition cache/capture progress

player.addEventListener("ready", (e) => {
  console.log(`Duration: ${e.detail.duration}s`);
});

player.addEventListener("ended", () => {
  console.log("Done!");
});

Sizing

The player fills its container and scales the composition to fit while preserving aspect ratio. Set a size on the element or its parent:

hyperframes-player {
  width: 100%;
  max-width: 800px;
  aspect-ratio: 16 / 9;
}

The width and height attributes define the composition's native resolution for aspect ratio calculation — they don't set the player's display size.

How it works

The player renders compositions in a sandboxed <iframe> inside a Shadow DOM. It communicates with the HyperFrames runtime via postMessage. If the composition has GSAP timelines (window.__timelines) but no runtime, the player auto-injects it from CDN.

Distribution

Format	File	Use case
ESM	`hyperframes-player.js`	Bundlers (Vite, webpack, etc.)
CJS	`hyperframes-player.cjs`	Node.js / require()
IIFE	`hyperframes-player.global.js`	`<script>` tag, CDN

All formats are minified with source maps. TypeScript definitions included.

License

MIT

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