> ## Documentation Index
> Fetch the complete documentation index at: /llms.txt
> Use this file to discover all available pages before exploring further.

# Skeleton Reveal

> A skeleton loader transition that pulses, then cross-fades into content

# Skeleton Reveal

A skeleton loader transition that pulses, then cross-fades into content

**Skeleton Reveal**

```html skeleton-reveal.html theme={null}
<!--
  Skeleton Reveal - transitions.dev-inspired primitive for HyperFrames.

  Paste the markup and CSS into a composition. Use the timeline integration
  note at the bottom as the starting point for deterministic GSAP animation.

  Variables. The script reads each one, falls back to the declared default on
  anything missing or invalid, and writes the result as a custom property the
  CSS below consumes, or straight onto the revealed text. The timeline recipe
  stays untouched: it keeps sweeping the skeleton and cross-fading to the
  content, and these decide what that content says and what both halves look
  like.

    - name (string, default Jane Cooper): the primary line revealed once the
      skeleton fades out. Blank falls back to the default.
    - detail (string, default jane@example.com): the secondary line under the
      name, such as an email or a role. Blank falls back to the default.
    - tone (light | dark, default light): card palette. Light is the paper card
      with grey bars, dark is a near-black card with the matching skeleton bars
      and text, for compositions on a dark stage.

  On every default the result is identical to the original: a white card that
  shimmers, then reveals Jane Cooper and jane@example.com.
-->

<div
  class="hf-transition-skeleton-reveal"
  data-composition-variables='[
    { "id": "name", "type": "string", "role": "content", "label": "Name", "description": "Primary line revealed once the skeleton fades out.", "default": "Jane Cooper" },
    { "id": "detail", "type": "string", "role": "content", "label": "Detail", "description": "Secondary line under the name, such as an email or a role.", "default": "jane@example.com" },
    { "id": "tone", "type": "enum", "role": "style", "label": "Tone", "description": "Card palette. Light is the paper card, dark is a near-black card with the matching skeleton bars and text.", "default": "light", "options": [{ "value": "light", "label": "Light" }, { "value": "dark", "label": "Dark" }] }
  ]'
>
  <div class="skeleton"></div>
  <div class="content"><strong>Jane Cooper</strong><span>jane@example.com</span></div>
</div>

<style>
  .hf-transition-skeleton-reveal {
    position: relative;
    width: 340px;
    height: 76px;
    font-family: Inter, system-ui, sans-serif;
  }
  .hf-transition-skeleton-reveal .skeleton,
  .hf-transition-skeleton-reveal .content {
    position: absolute;
    inset: 0;
    border: 1px solid var(--hf-sr-border, #e4e4e7);
    border-radius: 14px;
    background: var(--hf-sr-surface, #fff);
  }
  .hf-transition-skeleton-reveal .skeleton {
    background: linear-gradient(
      90deg,
      var(--hf-sr-bar, #f4f4f5),
      var(--hf-sr-bar-strong, #e4e4e7),
      var(--hf-sr-bar, #f4f4f5)
    );
    background-size: 240% 100%;
    opacity: 1;
  }
  .hf-transition-skeleton-reveal .content {
    display: grid;
    align-content: center;
    gap: 5px;
    padding: 15px;
    opacity: 0;
    color: var(--hf-sr-ink, #18181b);
  }
  .hf-transition-skeleton-reveal span {
    color: var(--hf-sr-muted, #71717a);
    font-size: 14px;
  }
</style>

<script>
  (function () {
    "use strict";

    var vars =
      window.__hyperframes && window.__hyperframes.getVariables
        ? window.__hyperframes.getVariables()
        : {};

    // Unrecognised overrides return to their declared defaults.
    var tones = {
      light: null,
      dark: {
        "--hf-sr-surface": "#18181b",
        "--hf-sr-border": "#27272a",
        "--hf-sr-bar": "#27272a",
        "--hf-sr-bar-strong": "#3f3f46",
        "--hf-sr-ink": "#fafafa",
        "--hf-sr-muted": "#a1a1aa",
      },
    };
    var defaultName = "Jane Cooper";
    var defaultDetail = "jane@example.com";

    function pick(table, value, fallback) {
      return Object.prototype.hasOwnProperty.call(table, value) ? value : fallback;
    }

    function text(value, fallback) {
      return typeof value === "string" && value.trim() ? value.trim() : fallback;
    }

    var tone = tones[pick(tones, vars.tone, "light")];
    var name = text(vars.name, defaultName);
    var detail = text(vars.detail, defaultDetail);

    var roots = document.querySelectorAll(".hf-transition-skeleton-reveal");
    for (var i = 0; i < roots.length; i += 1) {
      var root = roots[i];
      if (tone) {
        for (var key in tone) root.style.setProperty(key, tone[key]);
      }
      var strong = root.querySelector(".content strong");
      var span = root.querySelector(".content span");
      if (strong) strong.textContent = name;
      if (span) span.textContent = detail;
    }
  })();
</script>

<!--
  Timeline integration:
  tl.to('.hf-transition-skeleton-reveal .skeleton', { backgroundPosition: '100% 0', duration: 0.7, ease: 'none' }, startTime); tl.to('.hf-transition-skeleton-reveal .skeleton', { opacity: 0, duration: 0.22 }, startTime + 0.72); tl.to('.hf-transition-skeleton-reveal .content', { opacity: 1, duration: 0.24 }, startTime + 0.78);
-->
```

Copy npx hyperframes add skeleton-reveal to the clipboard

That writes one file: `compositions/components/skeleton-reveal.html`.

## Paste it into your composition

Open `compositions/components/skeleton-reveal.html` and copy what is inside into your own composition.
The file opens with a comment header that walks you through it.

A component has no size or duration of its own. It takes both from the composition
you paste it into.

## Variables

Every one of these has a default, so the piece works untouched. Set the ones you
want to change on the element:

| Variable | Default | Accepts | What it does |
| - | - | - | - |
| `name` | `Jane Cooper` | string | Primary line revealed once the skeleton fades out. |
| `detail` | `jane@example.com` | string | Secondary line under the name, such as an email or a role. |
| `tone` | `light` | `light`, `dark` | Card palette. Light is the paper card, dark is a near-black card with the matching skeleton bars and text. |

Set them with `data-variable-values` on the element that mounts it. These are the
defaults, so this behaves exactly like the preview above until you change one:

```html wrap theme={null}
<div
  data-composition-id="skeleton-reveal"
  data-composition-src="compositions/components/skeleton-reveal.html"
  data-variable-values='{"name":"Jane Cooper","detail":"jane@example.com","tone":"light"}'
></div>
```

Tagged `video-primitive` `transition-primitive` `transitions-dev-port` `skeleton` `reveal`.

## Related topics

* [Browse the complete Catalog](/catalog.md)
* [Add assets and Catalog items in the browser editor](/studio/assets-and-blocks.md)
* [Put blocks together into one video](/concepts/compositions.md)


## Related topics

- [Panel Reveal](/catalog/components/panel-reveal.md)
- [Scramble Reveal](/catalog/components/scramble-reveal.md)
- [Curtain Reveal](/catalog/components/curtain-reveal.md)


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