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

# Per-Word Crossfade

> Words gently fade into place with a short vertical drift for calm keynote rhythm.

# Per-Word Crossfade

Words gently fade into place with a short vertical drift for calm keynote rhythm.

**Per-Word Crossfade**

```html per-word-crossfade.html
<!--
  Per-Word Crossfade - typography primitive for HyperFrames.

  Paste the markup, CSS and script into a composition. Drive the timeline
  integration from a paused GSAP timeline so renders remain deterministic.

  Variables. The script reads each one, falls back to the declared default on
  anything missing or unrecognised, and either rewrites the words or writes a
  custom property the CSS below consumes. The timeline recipe at the end is
  untouched by them: it keeps driving one offset and one blur, and these
  decide what that offset and that blur mean on screen.

    - text (string, default "Create once reuse everywhere"): the line to
      animate. It is split on whitespace and every word gets its own span, so
      the stagger picks up the new words with no other change.
    - drift (close | standard | far, default standard): scales the vertical
      offset. close covers half the run, far nearly double, in the same time.
    - blur (soft | standard | heavy, default standard): scales the blur
      radius, from a light haze to a full smear.
    - tone (ink | paper | accent, default ink): word colour. ink is near-black
      for light frames, paper near-white for dark ones, accent rides --brand.

  On every default the result is identical to the original: four near-black
  words drifting 22px up through a 5px blur.
-->

<div
  class="hf-catalog-per-word-crossfade"
  data-composition-variables='[
    { "id": "text", "type": "string", "role": "content", "label": "Text", "description": "The line to animate. It is split on whitespace and every word gets its own span, so the stagger picks up the new words.", "default": "Create once reuse everywhere" },
    { "id": "drift", "type": "enum", "role": "motion", "label": "Drift", "description": "Scales the vertical offset, so the words cover a shorter or longer run in the same time.", "default": "standard", "options": [{ "value": "close", "label": "Close" }, { "value": "standard", "label": "Standard" }, { "value": "far", "label": "Far" }] },
    { "id": "blur", "type": "enum", "role": "style", "label": "Blur", "description": "Scales the blur radius the timeline drives, from a light haze to a full smear.", "default": "standard", "options": [{ "value": "soft", "label": "Soft" }, { "value": "standard", "label": "Standard" }, { "value": "heavy", "label": "Heavy" }] },
    { "id": "tone", "type": "enum", "role": "style", "label": "Tone", "description": "Word colour: ink for light frames, paper for dark ones, accent rides --brand.", "default": "ink", "options": [{ "value": "ink", "label": "Ink" }, { "value": "paper", "label": "Paper" }, { "value": "accent", "label": "Accent" }] }
  ]'
>
  <span>Create</span><span>once</span><span>reuse</span><span>everywhere</span>
</div>

<style>
  .hf-catalog-per-word-crossfade {
    color: var(--hf-word-color, #18181b);
    font-family: Inter, system-ui, sans-serif;
    font-weight: 900;
    letter-spacing: -0.04em;
  }
  .hf-catalog-per-word-crossfade {
    display: inline-flex;
    gap: 12px;
    font-size: 56px;
    line-height: 1;
  }
  .hf-catalog-per-word-crossfade span {
    display: inline-block;
    transform: translate(
        var(--hf-word-x, 0px),
        calc(var(--hf-word-y, 0px) * var(--hf-word-drift, 1))
      )
      scale(var(--hf-word-scale, 1));
    filter: blur(calc(var(--hf-word-blur, 0px) * var(--hf-word-blur-scale, 1)));
    will-change: transform, filter, opacity;
  }
</style>

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

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

    // Unrecognised overrides return to their declared defaults.
    var drifts = { close: 0.5, standard: 1, far: 1.85 };
    var blurScales = { soft: 0.45, standard: 1, heavy: 2.2 };
    var tones = {
      ink: "#18181b",
      paper: "#fafafa",
      accent: "var(--brand, #34d399)",
    };

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

    var drift = drifts[pick(drifts, vars.drift, "standard")];
    var blurScale = blurScales[pick(blurScales, vars.blur, "standard")];
    var tone = tones[pick(tones, vars.tone, "ink")];

    var text = typeof vars.text === "string" ? vars.text.trim() : "";
    var words = (text || "Create once reuse everywhere").split(/\s+/);

    var roots = document.querySelectorAll(".hf-catalog-per-word-crossfade");
    for (var i = 0; i < roots.length; i += 1) {
      var root = roots[i];
      root.style.setProperty("--hf-word-drift", String(drift));
      root.style.setProperty("--hf-word-blur-scale", String(blurScale));
      root.style.setProperty("--hf-word-color", tone);

      while (root.firstChild) {
        root.removeChild(root.firstChild);
      }
      for (var w = 0; w < words.length; w += 1) {
        var span = document.createElement("span");
        span.textContent = words[w];
        root.appendChild(span);
      }
    }
  })();
</script>

<!--
  Timeline integration:
  tl.fromTo('.hf-catalog-per-word-crossfade span', { opacity: 0, '--hf-word-y': '22px', '--hf-word-scale': 0.92, '--hf-word-blur': '5px' }, { opacity: 1, '--hf-word-y': '0px', '--hf-word-scale': 1, '--hf-word-blur': '0px', duration: 0.3, stagger: 0.055, ease: 'power3.out' }, startTime);
-->
```

Copy npx hyperframes add per-word-crossfade to the clipboard

That writes one file: `compositions/components/per-word-crossfade.html`.

## Paste it into your composition

Open `compositions/components/per-word-crossfade.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 |
| - | - | - | - |
| `text` | `Create once reuse everywhere` | string | The line to animate. It is split on whitespace and every word gets its own span, so the stagger picks up the new words. |
| `drift` | `standard` | `close`, `standard`, `far` | Scales the vertical offset, so the words cover a shorter or longer run in the same time. |
| `blur` | `standard` | `soft`, `standard`, `heavy` | Scales the blur radius the timeline drives, from a light haze to a full smear. |
| `tone` | `ink` | `ink`, `paper`, `accent` | Word colour: ink for light frames, paper for dark ones, accent rides --brand. |

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
<div
  data-composition-id="per-word-crossfade"
  data-composition-src="compositions/components/per-word-crossfade.html"
  data-variable-values='{"text":"Create once reuse everywhere","drift":"standard","blur":"standard","tone":"ink"}'
></div>
```

{/* hf:generated-footer */}

Tagged `motion-primitive` `typography`.

## 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)