> ## 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.

# Neon Accent

> Multi-color neon glow accents with wiggle drift animation

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-neon-accent 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-neon-accent.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-neon-accent.png");document.body.appendChild(p)});<\/script></body></html>`} />

## Install

<InstallCommand command="npx hyperframes add caption-neon-accent" item="caption-neon-accent" />

That writes one file: `compositions/components/caption-neon-accent.html`.

## Source

<Accordion title={`caption-neon-accent.html`}>
  ```html theme={null}
  <!doctype html>
  <html lang="en">
    <head>
      <meta charset="UTF-8" />
      <meta name="viewport" content="width=1920, height=1080" />
      <title>Neon Accent</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=Montserrat:wght@800&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: "Montserrat", Arial, sans-serif;
        }

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

        .caption-layer {
          position: absolute;
          inset: 0;
          z-index: 20;
          pointer-events: none;
          transform: translateZ(0);
        }

        .safe-zone {
          position: absolute;
          bottom: 100px;
          left: 50%;
          transform: translateX(-50%);
          width: 1400px;
          height: 260px;
          display: flex;
          align-items: center;
          justify-content: center;
        }

        .caption-group {
          position: absolute;
          left: 0;
          top: 0;
          width: 1400px;
          height: 260px;
          display: flex;
          align-items: center;
          justify-content: center;
          opacity: 0;
          transform-origin: 50% 50%;
          will-change: transform;
          backface-visibility: hidden;
        }

        .caption-copy {
          display: flex;
          flex-direction: column;
          align-items: center;
          justify-content: center;
          max-width: 1400px;
          text-align: center;
        }

        .caption-line {
          display: flex;
          align-items: center;
          justify-content: center;
          gap: 16px;
          width: max-content;
          max-width: 1400px;
          line-height: 1.1;
          white-space: nowrap;
        }

        .caption-word {
          display: inline-block;
          color: #ffffff;
          font-family: "Montserrat", Arial, sans-serif;
          font-weight: 800;
          font-size: 88px;
          line-height: 1.1;
          letter-spacing: 0;
          text-transform: uppercase;
        }

        .caption-word.accent {
          font-size: 106px;
        }
      </style>
    </head>
    <body>
      <div
        id="neon-accent"
        data-composition-id="caption-neon-accent"
        data-timeline-locked
        data-start="0"
        data-duration="8"
        data-fps="30"
        data-width="1920"
        data-height="1080"
      >
        <div class="caption-layer" aria-hidden="true">
          <div id="caption-stage" class="safe-zone"></div>
        </div>
      </div>

      <script>
        var DURATION = 8;
        var SAFE_ZONE_WIDTH = 1400;
        var BASE_FONT_SIZE = 88;
        var ACCENT_FONT_SIZE = 106;
        var MIN_FONT_SIZE = 62;
        var MAX_WORDS_PER_GROUP = 4;
        var WORD_SPACING = 16;
        var PAUSE_THRESHOLD = 0.1;
        var ENTRY_DURATION = 7 / 30;
        var WIGGLE_DISTANCE = 14;
        var WIGGLE_CYCLE = 2 / 1.3;
        var FONT_WIDTH_SAFETY = 1.14;
        var PRIMARY_COLOR = "#FFFFFF";
        var ACCENT_COLORS = ["#53FF01", "#FF0002", "#FCFF00"];
        var TRANSITION_WORDS = new Set([
          "the",
          "a",
          "an",
          "and",
          "or",
          "but",
          "is",
          "are",
          "was",
          "were",
          "to",
          "of",
          "in",
          "on",
          "at",
          "for",
          "with",
          "by",
          "from",
          "as",
          "it",
          "its",
          "this",
          "that",
          "these",
          "those",
          "be",
          "been",
          "have",
          "has",
          "had",
          "do",
          "does",
          "did",
          "will",
          "would",
          "could",
          "should",
          "may",
          "might",
          "must",
          "can",
          "if",
          "then",
          "so",
          "just",
          "not",
          "no",
          "yes",
          "up",
          "out",
          "about",
          "lets",
          "you",
          "write",
          "render",
        ]);
        var KEYWORDS = new Set(["hyperframes", "html", "professional", "code", "cinema"]);

        var TRANSCRIPT = [
          { 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 },
        ];

        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;
        }

        gsap.registerPlugin && gsap.registerPlugin();

        function cleanText(text) {
          return String(text || "").trim();
        }

        function normalizeWords(rawWords) {
          return rawWords
            .map(function (item) {
              return {
                text: cleanText(item.word || item.text),
                start: Math.max(0, Number(item.start) || 0),
                end: Math.min(DURATION, Math.max(Number(item.start) || 0, Number(item.end) || 0)),
              };
            })
            .filter(function (word) {
              return word.text.length > 0;
            });
        }

        var measureCanvas = document.createElement("canvas");
        var measureContext = measureCanvas.getContext("2d");

        function seededRandom(seed) {
          var x = Math.sin(seed * 9999) * 10000;
          return x - Math.floor(x);
        }

        function isKeyword(text) {
          return KEYWORDS.has(text.toLowerCase().replace(/[^a-z]/g, ""));
        }

        function assignWordColors(words, groupIndex) {
          return words.map(function (word) {
            if (isKeyword(word.text)) {
              var colorIndex = Math.floor(seededRandom(groupIndex * 23 + 7) * ACCENT_COLORS.length);
              return ACCENT_COLORS[colorIndex];
            }
            var clean = word.text.toLowerCase().replace(/[^a-z']/g, "");
            if (TRANSITION_WORDS.has(clean)) return PRIMARY_COLOR;
            var rand = seededRandom(groupIndex * 7 + words.indexOf(word));
            if (rand > 0.6) {
              var ci = Math.floor(rand * ACCENT_COLORS.length) % ACCENT_COLORS.length;
              return ACCENT_COLORS[ci];
            }
            return PRIMARY_COLOR;
          });
        }

        function measureWord(word, color, fontSize) {
          var size = color === PRIMARY_COLOR ? fontSize : fontSize * 1.2;
          measureContext.font = "800 " + size + "px Montserrat";
          return measureContext.measureText(word.text.toUpperCase()).width * FONT_WIDTH_SAFETY;
        }

        function measureLineWidth(words, colors, fontSize) {
          return words.reduce(function (total, word, index) {
            return (
              total +
              measureWord(word, colors[index] || PRIMARY_COLOR, fontSize) +
              (index ? WORD_SPACING : 0)
            );
          }, 0);
        }

        function splitLinesForGroup(words, colors, fontSize) {
          var maxLineWidth = SAFE_ZONE_WIDTH;
          if (
            words.some(function (word, i) {
              return measureWord(word, colors[i] || PRIMARY_COLOR, fontSize) > maxLineWidth;
            })
          )
            return null;
          if (measureLineWidth(words, colors, fontSize) <= maxLineWidth)
            return [{ words: words, colors: colors }];
          var best = null;
          var bestDiff = Infinity;
          for (var split = 1; split < words.length; split++) {
            var fw = words.slice(0, split),
              sw = words.slice(split);
            var fc = colors.slice(0, split),
              sc = colors.slice(split);
            var fW = measureLineWidth(fw, fc, fontSize);
            var sW = measureLineWidth(sw, sc, fontSize);
            if (fW <= maxLineWidth && sW <= maxLineWidth) {
              var diff = Math.abs(fW - sW);
              if (diff < bestDiff) {
                best = [
                  { words: fw, colors: fc },
                  { words: sw, colors: sc },
                ];
                bestDiff = diff;
              }
            }
          }
          return best;
        }

        function makeGroups(words) {
          var groups = [];
          var current = [];
          words.forEach(function (word, index) {
            var nextWord = words[index + 1];
            var testGroup = current.concat([word]);
            var exceedsWords = testGroup.length > MAX_WORDS_PER_GROUP;
            var colors = assignWordColors(testGroup, groups.length);
            var exceedsFit = !splitLinesForGroup(testGroup, colors, BASE_FONT_SIZE);
            if (exceedsWords || exceedsFit) {
              if (current.length) groups.push(makeGroup(current, groups.length));
              current = [word];
              return;
            }
            current.push(word);
            var punctuation = /[,.:!?]$/.test(word.text);
            var pause = nextWord ? nextWord.start - word.end : 0;
            if (
              !nextWord ||
              punctuation ||
              pause >= PAUSE_THRESHOLD ||
              current.length >= MAX_WORDS_PER_GROUP
            ) {
              groups.push(makeGroup(current, groups.length));
              current = [];
            }
          });
          if (current.length) groups.push(makeGroup(current, groups.length));
          return groups;
        }

        function makeGroup(words, groupIndex) {
          var colors = assignWordColors(words, groupIndex);
          var groupText = words
            .map(function (w) {
              return w.text.toUpperCase();
            })
            .join(" ");
          var fontSize = fitFontSize(groupText, BASE_FONT_SIZE, "800", "Montserrat", SAFE_ZONE_WIDTH);
          while (fontSize > MIN_FONT_SIZE && !splitLinesForGroup(words, colors, fontSize)) {
            fontSize -= 2;
          }
          return {
            words: words.slice(),
            colors: colors,
            fontSize: fontSize,
            lines: splitLinesForGroup(words, colors, fontSize) || [{ words: words, colors: colors }],
            start: words[0].start,
            end: words[words.length - 1].end,
          };
        }

        function shadowForColor(color) {
          var hex = color.replace("#", "");
          var r = parseInt(hex.slice(0, 2), 16);
          var g = parseInt(hex.slice(2, 4), 16);
          var b = parseInt(hex.slice(4, 6), 16);
          var glow =
            "0 0 4px rgba(" +
            r +
            "," +
            g +
            "," +
            b +
            ",1), 0 0 10px rgba(" +
            r +
            "," +
            g +
            "," +
            b +
            ",0.9), 0 0 20px rgba(" +
            r +
            "," +
            g +
            "," +
            b +
            ",0.7), 0 0 40px rgba(" +
            r +
            "," +
            g +
            "," +
            b +
            ",0.4)";
          return "0 8px 16px rgba(0,0,0,0.8), 0 16px 40px rgba(0,0,0,0.6), " + glow;
        }

        function buildCaptions(groups) {
          var stage = document.getElementById("caption-stage");
          groups.forEach(function (group, groupIndex) {
            var groupEl = document.createElement("div");
            var copyEl = document.createElement("div");
            groupEl.id = "caption-group-" + groupIndex;
            groupEl.className = "caption-group";
            copyEl.className = "caption-copy";
            group.lines.slice(0, 2).forEach(function (line) {
              var lineEl = document.createElement("div");
              lineEl.className = "caption-line";
              line.words.forEach(function (word, wordIndex) {
                var color = line.colors[wordIndex] || PRIMARY_COLOR;
                var wordEl = document.createElement("span");
                wordEl.className = color === PRIMARY_COLOR ? "caption-word" : "caption-word accent";
                wordEl.textContent = word.text.toUpperCase();
                wordEl.style.color = color;
                wordEl.style.fontSize =
                  color === PRIMARY_COLOR ? group.fontSize + "px" : group.fontSize * 1.2 + "px";
                wordEl.style.textShadow = shadowForColor(color);
                lineEl.appendChild(wordEl);
              });
              copyEl.appendChild(lineEl);
            });
            groupEl.appendChild(copyEl);
            stage.appendChild(groupEl);
          });
        }

        var WORDS = normalizeWords(TRANSCRIPT);
        var GROUPS = makeGroups(WORDS);
        buildCaptions(GROUPS);

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

        var visibleStarts = GROUPS.map(function (group, groupIndex) {
          var prev = GROUPS[groupIndex - 1];
          var availableGap = prev ? Math.max(0, group.start - prev.end) : ENTRY_DURATION;
          var entryLead = Math.min(ENTRY_DURATION, availableGap);
          return Math.max(0, group.start - entryLead);
        });

        var allGroupEls = GROUPS.map(function (_, i) {
          return document.getElementById("caption-group-" + i);
        });

        GROUPS.forEach(function (group, groupIndex) {
          var groupEl = allGroupEls[groupIndex];
          var visibleStart = visibleStarts[groupIndex];
          var visibleEnd = groupIndex < GROUPS.length - 1 ? visibleStarts[groupIndex + 1] : DURATION;
          var direction = groupIndex % 2 === 0 ? -1 : 1;
          var D = WIGGLE_DISTANCE * direction;
          var wiggleCycles = Math.max(1, Math.ceil((visibleEnd - visibleStart) / WIGGLE_CYCLE));

          allGroupEls.forEach(function (otherEl, otherIndex) {
            if (otherIndex !== groupIndex) tl.set(otherEl, { opacity: 0 }, visibleStart);
          });

          tl.set(groupEl, { opacity: 0, scale: 0.65, x: 0, y: 0 }, visibleStart);
          tl.to(
            groupEl,
            { opacity: 1, scale: 1, duration: ENTRY_DURATION, ease: "power3.out", force3D: true },
            visibleStart,
          );
          tl.to(
            groupEl,
            {
              x: D,
              y: D,
              duration: WIGGLE_CYCLE / 2,
              ease: "sine.inOut",
              yoyo: true,
              repeat: Math.max(0, wiggleCycles * 2 - 1),
              force3D: true,
            },
            visibleStart,
          );
          tl.set(groupEl, { opacity: 0 }, visibleEnd);
        });

        window.__timelines["caption-neon-accent"] = tl;
      </script>
    </body>
  </html>
  ```
</Accordion>

## Usage

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

Tagged `captions` `caption-style` `neon` `glow` `accent`.

## Related topics

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