> ## Documentation Index
> Fetch the complete documentation index at: https://hyperframes-fix-nested-composition-media-inpoint.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Lower Third — Mask Reveal

> Cardless lower third: an accent sweep crosses and clip-path-reveals a heavy name, role fades up; for footage

export const InstallCommand = ({command, item}) => {
  const [copied, setCopied] = React.useState(false);
  const [tuned, setTuned] = React.useState("");
  React.useEffect(() => {
    if (!item) return;
    const read = () => {
      try {
        const raw = new URLSearchParams(window.location.search).get(`vars-${item}`);
        if (!raw) return setTuned("");
        const parsed = JSON.parse(raw);
        if (!parsed || typeof parsed !== "object" || Array.isArray(parsed)) return setTuned("");
        if (Object.keys(parsed).length === 0) return setTuned("");
        setTuned(` --vars '${JSON.stringify(parsed)}'`);
      } catch {
        setTuned("");
      }
    };
    read();
    window.addEventListener("hf-vars-changed", read);
    window.addEventListener("popstate", read);
    return () => {
      window.removeEventListener("hf-vars-changed", read);
      window.removeEventListener("popstate", read);
    };
  }, [item]);
  const fullCommand = `${command}${tuned}`;
  const copy = async () => {
    try {
      if (navigator.clipboard && window.isSecureContext) {
        await navigator.clipboard.writeText(fullCommand);
      } else {
        const previous = document.activeElement;
        const scratch = document.createElement("textarea");
        scratch.value = fullCommand;
        scratch.setAttribute("readonly", "");
        scratch.style.position = "fixed";
        scratch.style.opacity = "0";
        document.body.appendChild(scratch);
        scratch.select();
        document.execCommand("copy");
        document.body.removeChild(scratch);
        previous?.focus?.();
      }
      setCopied(true);
      setTimeout(() => setCopied(false), 2000);
    } catch {}
  };
  return <div className="hf-install-command not-prose my-4 flex items-stretch overflow-hidden rounded-xl border border-zinc-200 bg-zinc-50 dark:border-zinc-800 dark:bg-zinc-900">
      <code className="flex-1 overflow-x-auto whitespace-nowrap border-r border-zinc-200 px-4 py-3 font-mono text-sm text-zinc-800 dark:border-zinc-800 dark:text-zinc-100">
        {fullCommand}
      </code>
      <button type="button" onClick={copy} data-copied={copied ? "true" : "false"} aria-label={`Copy ${command} to the clipboard`} className="hf-install-copy">
        <svg className="hf-install-copy-clipboard" xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 18 18" fill="none" stroke="currentColor" strokeWidth="1.5" strokeLinecap="round" strokeLinejoin="round" aria-hidden="true">
          <path d="M14.25 5.25H7.25C6.14543 5.25 5.25 6.14543 5.25 7.25V14.25C5.25 15.3546 6.14543 16.25 7.25 16.25H14.25C15.3546 16.25 16.25 15.3546 16.25 14.25V7.25C16.25 6.14543 15.3546 5.25 14.25 5.25Z" />
          <path d="M2.80103 11.998L1.77203 5.07397C1.61003 3.98097 2.36403 2.96397 3.45603 2.80197L10.38 1.77297C11.313 1.63397 12.19 2.16297 12.528 3.00097" />
        </svg>
        <svg className="hf-install-copy-check" xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 18 18" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round" aria-hidden="true">
          <path d="M2.75 9.5L6.5 13.25L15.25 4.5" />
        </svg>
      </button>
      <span className="hf-install-copy-status" role="status" aria-live="polite">
        {copied ? "Copied" : ""}
      </span>
    </div>;
};

<iframe className="w-full aspect-video rounded-xl border-0 bg-zinc-100 dark:bg-zinc-800" title="lt-mask-reveal preview" loading="lazy" srcDoc={`<!doctype html><html><head><meta charset="utf-8"><style>html,body{margin:0;height:100%;overflow:hidden;background:transparent}hyperframes-player{display:block;width:100%;height:100%}</style><script src="https://cdn.jsdelivr.net/npm/@hyperframes/player@0.7/dist/hyperframes-player.global.js"><\/script></head><body><script>fetch("/public/catalog/blocks/lt-mask-reveal.json").then(function(r){return r.json()}).then(function(d){var p=document.createElement("hyperframes-player");p.setAttribute("srcdoc",d.html);p.setAttribute("controls","");p.setAttribute("autoplay","");p.setAttribute("loop","");p.setAttribute("muted","");p.setAttribute("poster","https://static.heygen.ai/hyperframes-oss/docs/images/catalog/blocks/lt-mask-reveal.png");document.body.appendChild(p)});<\/script></body></html>`} />

## Install

<InstallCommand command="npx hyperframes add lt-mask-reveal" item="lt-mask-reveal" />

That writes one file: `compositions/lt-mask-reveal.html`.

## Source

<Accordion title={`lt-mask-reveal.html`}>
  ```html theme={null}
  <!doctype html>
  <html lang="en">
    <head>
      <meta charset="UTF-8" />
      <script src="https://cdn.jsdelivr.net/npm/gsap@3.14.2/dist/gsap.min.js"></script>
      <style>
        * {
          margin: 0;
          padding: 0;
          box-sizing: border-box;
        }
        html,
        body {
          background: transparent;
          overflow: hidden;
        }
        body {
          width: 1920px;
          height: 1080px;
          font-family: "Montserrat", sans-serif;
        }

        #root .lt {
          position: absolute;
          left: 130px;
          bottom: 122px;
          display: flex;
          flex-direction: column;
          align-items: flex-start;
          gap: 14px;
        }
        #root .lt-namewrap {
          position: relative;
          overflow: hidden;
          padding: 2px 0;
        }
        #root .lt-name {
          font-size: 72px;
          font-weight: 900;
          color: #ffffff;
          line-height: 0.98;
          letter-spacing: -0.02em;
          white-space: nowrap;
          text-shadow: 0 2px 22px rgba(0, 0, 0, 0.45);
          will-change: clip-path;
        }
        #root .lt-sweep {
          position: absolute;
          top: 0;
          bottom: 0;
          left: 0;
          width: 8px;
          background: #ffd23f;
        }
        #root .lt-role {
          font-size: 28px;
          font-weight: 500;
          color: #e7eaf0;
          line-height: 1.2;
          letter-spacing: 0.02em;
          white-space: nowrap;
          text-shadow: 0 2px 16px rgba(0, 0, 0, 0.45);
        }
      </style>
    </head>
    <body>
      <div
        id="root"
        data-composition-id="lt-mask-reveal"
        data-width="1920"
        data-height="1080"
        data-start="0"
        data-duration="4.8"
      >
        <div id="lt-clip" class="clip" data-start="0" data-duration="4.8" data-track-index="0">
          <div id="lt" class="lt">
            <div class="lt-namewrap">
              <div id="lt-name" class="lt-name">Dr. Maya Chen</div>
              <div id="lt-sweep" class="lt-sweep"></div>
            </div>
            <div id="lt-role" class="lt-role">Host · Neuroscientist</div>
          </div>
        </div>
      </div>

      <script>
        window.__timelines = window.__timelines || {};
        var tl = gsap.timeline({ paused: true });

        var wrap = document.getElementById("lt");
        var nameEl = document.getElementById("lt-name");
        var sweep = document.getElementById("lt-sweep");
        var role = document.getElementById("lt-role");

        // An accent sweep crosses left→right; the name is revealed by a clip-path wipe behind it; role fades up.
        // Sweep travel: left:"100%" was parent-relative (offsetParent = .lt-namewrap). Since the sweep is
        // only 8px wide, xPercent would travel just 8px, so translate by the container width in pixels instead.
        // The .lt-namewrap shrink-wraps the name "Dr. Maya Chen" to 536px (no horizontal padding/border, so
        // clientWidth == content width), which is exactly what left:"100%" resolved to.
        var SWEEP_TRAVEL = 536;
        gsap.set(nameEl, { clipPath: "inset(0 100% 0 0)" });
        gsap.set(sweep, { x: 0, opacity: 0 });
        gsap.set(role, { y: 14, opacity: 0 });

        tl.to(sweep, { opacity: 1, duration: 0.12, ease: "none" }, 0.1);
        tl.to(sweep, { x: SWEEP_TRAVEL, duration: 0.55, ease: "power2.inOut" }, 0.12);
        tl.to(nameEl, { clipPath: "inset(0 0% 0 0)", duration: 0.5, ease: "power2.inOut" }, 0.16);
        tl.to(sweep, { opacity: 0, duration: 0.15, ease: "none" }, 0.6);
        tl.to(role, { y: 0, opacity: 1, duration: 0.5, ease: "power3.out" }, 0.55);

        // Exit: name un-wipes, role fades, hard kill.
        tl.to(role, { opacity: 0, duration: 0.3, ease: "power2.in" }, 4.25);
        tl.to(nameEl, { clipPath: "inset(0 0 0 100%)", duration: 0.4, ease: "power2.in" }, 4.3);
        tl.set(wrap, { visibility: "hidden" }, 4.75);

        window.__timelines["lt-mask-reveal"] = tl;
      </script>
    </body>
  </html>
  ```
</Accordion>

## Usage

After installing, add the block to your host composition:

```html theme={null}
<div data-composition-id="lt-mask-reveal" data-composition-src="compositions/lt-mask-reveal.html" data-start="0" data-duration="4.8" data-track-index="1" data-width="1920" data-height="1080"></div>
```

Tagged `lower-third` `overlay` `podcast` `interview` `bold`.

## Related topics

* [Browse the complete Catalog](/catalog)
* [Add assets and Catalog items in Studio](/studio/assets-and-blocks)
* [Build a richer composition](/go-further)
