> ## 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.

# Parallax Layers

> Behind-subject 3D text layering with vertical stretch effect

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="caption-parallax-layers 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/components/caption-parallax-layers.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/components/caption-parallax-layers.png");document.body.appendChild(p)});<\/script></body></html>`} />

## Install

<InstallCommand command="npx hyperframes add caption-parallax-layers" item="caption-parallax-layers" />

That writes one file: `compositions/components/caption-parallax-layers.html`.

## Source

<Accordion title={`caption-parallax-layers.html`}>
  ```html theme={null}
  <!doctype html>
  <html lang="en">
    <head>
      <meta charset="UTF-8" />
      <meta name="viewport" content="width=1920, height=1080" />
      <title>Parallax Layers</title>
      <link rel="preconnect" href="https://fonts.googleapis.com" />
      <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin />
      <link
        href="https://fonts.googleapis.com/css2?family=Instrument+Serif:ital@0;1&display=swap"
        rel="stylesheet"
      />
      <script src="https://cdn.jsdelivr.net/npm/gsap@3.14.2/dist/gsap.min.js"></script>
      <style>
        *,
        *::before,
        *::after {
          box-sizing: border-box;
        }

        html,
        body {
          width: 1920px;
          height: 1080px;
          margin: 0;
          overflow: hidden;
          background: transparent;
          font-family: "Instrument Serif", serif;
        }

        #parallax-layers {
          pointer-events: none;
          position: relative;
          width: 1920px;
          height: 1080px;
          overflow: hidden;
          background: transparent;
        }

        /* Behind captions: big red 3D text */
        .behind-caption-layer {
          position: absolute;
          inset: 0;
          z-index: 10;
          pointer-events: none;
          transform: translateZ(0);
        }

        /* Front captions */
        .front-caption-layer {
          position: absolute;
          inset: 0;
          z-index: 30;
          pointer-events: none;
          transform: translateZ(0);
        }

        .behind-safe-zone {
          position: absolute;
          top: 40px;
          left: 0;
          width: 1920px;
          height: 500px;
        }

        .front-safe-zone {
          position: absolute;
          top: 700px;
          left: 0;
          width: 1920px;
          height: 300px;
        }

        .caption-block {
          position: absolute;
          left: 50%;
          top: 0;
          transform: translateX(-50%);
          opacity: 0;
          transform-origin: 50% 50%;
          will-change: transform, opacity;
          backface-visibility: hidden;
        }

        .caption-line {
          display: flex;
          align-items: baseline;
          justify-content: center;
          gap: 14px;
          line-height: 1.1;
          white-space: nowrap;
        }

        .caption-line--behind {
          transform: scaleY(2.8);
          transform-origin: 50% 0%;
        }

        .word {
          display: inline-block;
          will-change: transform, opacity;
          backface-visibility: hidden;
        }

        .word--behind {
          font-family: "Instrument Serif", serif;
          font-size: 220px;
          font-weight: 400;
          font-style: normal;
          line-height: 0.9;
          color: #e50914;
          -webkit-text-stroke: 5px #e50914;
          text-shadow: 2px 4px 4px #a30610;
        }

        .word--front-normal {
          font-family: "Instrument Serif", serif;
          font-size: 130px;
          font-weight: 400;
          font-style: normal;
          color: #eeeeee;
          text-shadow:
            0 2px 12px rgba(0, 0, 0, 0.6),
            0 4px 24px rgba(0, 0, 0, 0.35);
        }

        .word--front-italic {
          font-family: "Instrument Serif", serif;
          font-size: 130px;
          font-weight: 400;
          font-style: italic;
          color: #eeeeee;
          text-shadow:
            0 2px 12px rgba(0, 0, 0, 0.6),
            0 4px 24px rgba(0, 0, 0, 0.35);
        }
      </style>
    </head>
    <body>
      <div
        id="parallax-layers"
        data-composition-id="caption-parallax-layers"
        data-timeline-locked
        data-start="0"
        data-duration="8"
        data-fps="30"
        data-width="1920"
        data-height="1080"
      >
        <div class="behind-caption-layer" aria-hidden="true">
          <div id="behind-stage" class="behind-safe-zone"></div>
        </div>

        <div class="front-caption-layer" aria-hidden="true">
          <div id="front-stage" class="front-safe-zone"></div>
        </div>
      </div>

      <script>
        var DURATION = 8;
        var BEHIND_WIDTH = 1800;
        var FRONT_WIDTH = 1750;
        var ENTRY_DUR = 0.1;
        var SLIDE_DUR = 0.2;

        var _fitCanvas = document.createElement("canvas");
        var _fitCtx = _fitCanvas.getContext("2d");
        function fitFontSize(text, baseFontSize, fontWeight, fontFamily, maxWidth) {
          var size = baseFontSize;
          var minSize = Math.floor(baseFontSize * 0.45);
          while (size > minSize) {
            _fitCtx.font = fontWeight + " " + size + "px " + fontFamily;
            if (_fitCtx.measureText(text).width <= maxWidth) return size;
            size -= 2;
          }
          return minSize;
        }

        var W = [
          { text: "Every", start: 0.0, end: 0.3 },
          { text: "great", start: 0.3, end: 0.55 },
          { text: "video", start: 0.55, end: 0.85 },
          { text: "starts", start: 0.85, end: 1.1 },
          { text: "with", start: 1.1, end: 1.25 },
          { text: "a", start: 1.25, end: 1.35 },
          { text: "single", start: 1.35, end: 1.65 },
          { text: "frame.", start: 1.65, end: 2.0 },
          { text: "HyperFrames", start: 2.1, end: 2.65 },
          { text: "lets", start: 2.65, end: 2.85 },
          { text: "you", start: 2.85, end: 2.95 },
          { text: "write", start: 2.95, end: 3.15 },
          { text: "HTML", start: 3.15, end: 3.55 },
          { text: "and", start: 3.55, end: 3.65 },
          { text: "render", start: 3.65, end: 3.95 },
          { text: "professional", start: 3.95, end: 4.45 },
          { text: "video.", start: 4.45, end: 4.8 },
          { text: "No", start: 4.9, end: 5.05 },
          { text: "timeline.", start: 5.05, end: 5.45 },
          { text: "No", start: 5.5, end: 5.65 },
          { text: "drag", start: 5.65, end: 5.85 },
          { text: "and", start: 5.85, end: 5.95 },
          { text: "drop.", start: 5.95, end: 6.25 },
          { text: "Just", start: 6.35, end: 6.55 },
          { text: "code", start: 6.55, end: 6.8 },
          { text: "that", start: 6.8, end: 6.95 },
          { text: "becomes", start: 6.95, end: 7.3 },
          { text: "cinema.", start: 7.3, end: 7.7 },
        ];

        // behind=red 3D emphasis words, front=normal white words
        var BLOCKS = [
          { behind: null, front: [[0], [1], [2]] },
          { behind: [[3]], front: [[4], [5]] },
          { behind: [[6]], front: [[7]] },
          { behind: [[8]], front: [[9], [10], [11]] },
          { behind: [[12]], front: [[13], [14]] },
          { behind: [[15]], front: [[16]] },
          { behind: null, front: [[17], [18]] },
          { behind: null, front: [[19], [20], [21], [22]] },
          { behind: [[24]], front: [[23], [25], [26]] },
          { behind: [[27]], front: null },
        ];

        var behindStage = document.getElementById("behind-stage");
        var frontStage = document.getElementById("front-stage");

        BLOCKS.forEach(function (block, bi) {
          var bEl = document.createElement("div");
          bEl.className = "caption-block";
          bEl.id = "bb" + bi;
          if (block.behind) {
            var behindText = block.behind
              .map(function (wi_arr) {
                return W[wi_arr[0]].text;
              })
              .join(" ");
            var behindSize = fitFontSize(behindText, 220, "400", "Instrument Serif", BEHIND_WIDTH);
            var bLine = document.createElement("div");
            bLine.className = "caption-line caption-line--behind";
            block.behind.forEach(function (wi_arr, wi) {
              var span = document.createElement("span");
              span.className = "word word--behind";
              span.id = "bb" + bi + "w" + wi;
              span.textContent = W[wi_arr[0]].text;
              span.style.fontSize = behindSize + "px";
              bLine.appendChild(span);
            });
            bEl.appendChild(bLine);
          }
          behindStage.appendChild(bEl);

          var fEl = document.createElement("div");
          fEl.className = "caption-block";
          fEl.id = "fb" + bi;
          if (block.front) {
            var frontText = block.front
              .map(function (wi_arr) {
                return W[wi_arr[0]].text;
              })
              .join(" ");
            var frontSize = fitFontSize(frontText, 130, "400", "Instrument Serif", FRONT_WIDTH);
            var fLine = document.createElement("div");
            fLine.className = "caption-line";
            block.front.forEach(function (wi_arr, wi) {
              var span = document.createElement("span");
              var isItalic = wi_arr[0] === 7 || wi_arr[0] === 18; // frame., timeline.
              span.className = "word " + (isItalic ? "word--front-italic" : "word--front-normal");
              span.id = "fb" + bi + "w" + wi;
              span.textContent = W[wi_arr[0]].text;
              span.style.fontSize = frontSize + "px";
              fLine.appendChild(span);
            });
            fEl.appendChild(fLine);
          }
          frontStage.appendChild(fEl);
        });

        var allBehind = BLOCKS.map(function (_, i) {
          return document.getElementById("bb" + i);
        });
        var allFront = BLOCKS.map(function (_, i) {
          return document.getElementById("fb" + i);
        });

        function applyBehindScales() {
          BLOCKS.forEach(function (block, bi) {
            if (block.behind) {
              var line = allBehind[bi].querySelector(".caption-line");
              if (line) {
                var natW = line.scrollWidth;
                if (natW > 0) {
                  var s = BEHIND_WIDTH / natW;
                  line.style.transform = "scaleX(" + s + ") scaleY(2.8)";
                }
              }
            }
          });
        }
        applyBehindScales();

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

        function blockStart(bi) {
          var b = BLOCKS[bi];
          var firstIdx = b.behind ? b.behind[0][0] : b.front[0][0];
          return W[firstIdx].start;
        }

        BLOCKS.forEach(function (block, bi) {
          var start = blockStart(bi);
          var nextStart = bi < BLOCKS.length - 1 ? blockStart(bi + 1) : DURATION;
          var bEl = allBehind[bi];
          var fEl = allFront[bi];

          allBehind.forEach(function (other, oi) {
            if (oi !== bi) tl.set(other, { opacity: 0 }, start);
          });
          allFront.forEach(function (other, oi) {
            if (oi !== bi) tl.set(other, { opacity: 0 }, start);
          });

          if (block.behind) {
            tl.set(bEl, { opacity: 1 }, start);
            block.behind.forEach(function (wi_arr, wi) {
              var wordEl = document.getElementById("bb" + bi + "w" + wi);
              var wordStart = W[wi_arr[0]].start;
              tl.set(wordEl, { opacity: 0 }, start);
              tl.to(wordEl, { opacity: 1, duration: ENTRY_DUR, ease: "power2.out" }, wordStart);
            });
          }

          if (block.front) {
            tl.set(fEl, { opacity: 1 }, start);
            block.front.forEach(function (wi_arr, wi) {
              var wordEl = document.getElementById("fb" + bi + "w" + wi);
              var wordStart = W[wi_arr[0]].start;
              tl.set(wordEl, { opacity: 0 }, start);
              tl.set(wordEl, { opacity: 1 }, wordStart);
            });
          }

          tl.set(bEl, { opacity: 0 }, nextStart);
          tl.set(fEl, { opacity: 0 }, nextStart);
        });

        tl.to({}, { duration: DURATION }, 0);
        window.__timelines["caption-parallax-layers"] = tl;

        document.fonts.ready.then(function () {
          applyBehindScales();
        });
      </script>
    </body>
  </html>
  ```
</Accordion>

## Usage

Open `compositions/components/caption-parallax-layers.html` and paste its contents into your composition. See the comment header in the file for detailed instructions.

Tagged `captions` `caption-style` `parallax` `3d` `depth`.

## Related topics

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