> ## 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.

# Pill Karaoke

> Pill-shaped container with per-word karaoke color highlight

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

## Install

<InstallCommand command="npx hyperframes add caption-pill-karaoke" item="caption-pill-karaoke" />

That writes one file: `compositions/components/caption-pill-karaoke.html`.

## Source

<Accordion title={`caption-pill-karaoke.html`}>
  ```html theme={null}
  <!doctype html>
  <html lang="en">
    <head>
      <meta charset="UTF-8" />
      <meta name="viewport" content="width=1920, height=1080" />
      <title>Pill Karaoke</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=Poppins:wght@700&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: "Poppins", Arial, sans-serif;
        }

        #pill-karaoke {
          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: 1600px;
          height: 220px;
          display: flex;
          align-items: center;
          justify-content: center;
        }

        .caption-group {
          position: absolute;
          left: 0;
          top: 0;
          width: 1600px;
          height: 220px;
          display: flex;
          align-items: center;
          justify-content: center;
          opacity: 0;
        }

        .caption-pill {
          width: auto;
          max-width: 1600px;
          padding: 18px 60px 20px;
          border-radius: 22px;
          background: #e7e5e7;
          box-shadow: 0 2px 8px rgba(0, 0, 0, 0.12);
          text-align: center;
          overflow: visible;
        }

        .caption-copy {
          display: flex;
          flex-direction: column;
          align-items: center;
          justify-content: center;
          width: 100%;
          color: #a6a6a6;
          font-family: "Poppins", Arial, sans-serif;
          font-size: 72px;
          font-weight: 700;
          line-height: 1.16;
          letter-spacing: 0;
          white-space: nowrap;
          word-break: normal;
          overflow: visible;
        }

        .caption-line {
          display: flex;
          justify-content: center;
          gap: 16px;
          width: 100%;
          max-width: none;
          line-height: 1.16;
          white-space: nowrap;
          overflow: visible;
        }

        .caption-word {
          display: inline-block;
          color: #a6a6a6;
        }
      </style>
    </head>
    <body>
      <div
        id="pill-karaoke"
        data-composition-id="caption-pill-karaoke"
        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 PILL_MAX_WIDTH = 1400;
        var PILL_MIN_PADDING_X = 30;
        var PILL_MAX_PADDING_X = 60;
        var FONT_WIDTH_SAFETY = 1.18;
        var FONT_FAMILY = "Poppins";
        var FONT_WEIGHT = "700";
        var BASE_FONT_SIZE = 72;
        var MIN_FONT_SIZE = 52;
        var MAX_WORDS_PER_GROUP = 4;
        var WORD_SPACING = 16;
        var PAUSE_THRESHOLD = 0.1;
        var GROUP_END_BUFFER = 0.3;
        var COLOR_INACTIVE = "#A6A6A6";
        var COLOR_ACTIVE = "#1C1E1D";
        var COLOR_FADE_DURATION = 0.1;
        var WORD_FADE_LEAD = 0.05;

        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 },
        ];

        function normalizeWords(rawWords) {
          return rawWords
            .map(function (item) {
              var text = String(item.word || item.text || "").trim();
              return {
                text: 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 (w) {
              return w.text.length > 0;
            });
        }

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

        function measureWordWidth(text, fontSize) {
          measureContext.font = FONT_WEIGHT + " " + fontSize + "px " + FONT_FAMILY;
          return measureContext.measureText(text).width * FONT_WIDTH_SAFETY;
        }

        function measureLineWidth(words, fontSize) {
          return words.reduce(function (total, word, index) {
            return (
              total + measureWordWidth(word.text.toLowerCase(), fontSize) + (index ? WORD_SPACING : 0)
            );
          }, 0);
        }

        function splitLinesForGroup(words, fontSize) {
          var maxLineWidth = PILL_MAX_WIDTH - PILL_MIN_PADDING_X * 2;
          if (
            words.some(function (w) {
              return measureWordWidth(w.text.toLowerCase(), fontSize) > maxLineWidth;
            })
          ) {
            return null;
          }
          if (measureLineWidth(words, fontSize) <= maxLineWidth) return [words];
          var bestSplit = null;
          var bestImbalance = Infinity;
          for (var split = 1; split < words.length; split++) {
            var firstLine = words.slice(0, split);
            var secondLine = words.slice(split);
            var firstWidth = measureLineWidth(firstLine, fontSize);
            var secondWidth = measureLineWidth(secondLine, fontSize);
            if (firstWidth <= maxLineWidth && secondWidth <= maxLineWidth) {
              var imbalance = Math.abs(firstWidth - secondWidth);
              if (imbalance < bestImbalance) {
                bestSplit = [firstLine, secondLine];
                bestImbalance = imbalance;
              }
            }
          }
          return bestSplit;
        }

        function fitsInTwoLinesAtSize(words, fontSize) {
          return splitLinesForGroup(words, fontSize) !== null;
        }

        function planPillLayout(words, fontSize) {
          var lines = splitLinesForGroup(words, fontSize) || [words];
          var widestLine = lines.reduce(function (max, lineWords) {
            return Math.max(max, measureLineWidth(lineWords, fontSize));
          }, 0);
          var availablePadding = Math.floor((PILL_MAX_WIDTH - widestLine) / 2);
          var padX = Math.max(PILL_MIN_PADDING_X, Math.min(PILL_MAX_PADDING_X, availablePadding));
          var pillWidth = Math.min(PILL_MAX_WIDTH, Math.ceil(widestLine + padX * 2));
          return { lines: lines, padX: padX, pillWidth: pillWidth };
        }

        function makeGroups(words) {
          var groups = [];
          var current = [];
          words.forEach(function (word, index) {
            var testGroup = current.concat([word]);
            var nextWord = words[index + 1];
            var wouldExceedMaxWords = testGroup.length > MAX_WORDS_PER_GROUP;
            var wouldExceedTwoLines = !fitsInTwoLinesAtSize(testGroup, BASE_FONT_SIZE);
            if (wouldExceedMaxWords || wouldExceedTwoLines) {
              if (current.length) {
                groups.push({
                  words: current.slice(),
                  start: current[0].start,
                  end: current[current.length - 1].end,
                });
              }
              current = [word];
              return;
            }
            current.push(word);
            var hasPunctuation = /[,.:!?]$/.test(word.text);
            var pauseDuration = nextWord ? nextWord.start - word.end : 0;
            var hasNaturalPause = pauseDuration >= PAUSE_THRESHOLD;
            var maxWordsReached = current.length >= MAX_WORDS_PER_GROUP;
            if (maxWordsReached || !nextWord || hasPunctuation || hasNaturalPause) {
              groups.push({
                words: current.slice(),
                start: current[0].start,
                end: current[current.length - 1].end,
              });
              current = [];
            }
          });
          if (current.length)
            groups.push({
              words: current.slice(),
              start: current[0].start,
              end: current[current.length - 1].end,
            });
          return groups;
        }

        function fontSizeForGroup(words) {
          var size = BASE_FONT_SIZE;
          while (size > MIN_FONT_SIZE && !fitsInTwoLinesAtSize(words, size)) {
            size -= 2;
          }
          return size;
        }

        function buildCaptions(groups) {
          var stage = document.getElementById("caption-stage");
          groups.forEach(function (group, groupIndex) {
            var groupEl = document.createElement("div");
            var pillEl = document.createElement("div");
            var copyEl = document.createElement("div");
            var fontSize = fontSizeForGroup(group.words);
            groupEl.id = "caption-group-" + groupIndex;
            groupEl.className = "caption-group";
            pillEl.className = "caption-pill";
            copyEl.className = "caption-copy";
            copyEl.style.fontSize = fontSize + "px";
            var indexedWords = group.words.map(function (word, wordIndex) {
              return { text: word.text, start: word.start, end: word.end, wordIndex: wordIndex };
            });
            var layout = planPillLayout(indexedWords, fontSize);
            pillEl.style.width = layout.pillWidth + "px";
            pillEl.style.paddingLeft = layout.padX + "px";
            pillEl.style.paddingRight = layout.padX + "px";
            layout.lines.slice(0, 2).forEach(function (lineWords) {
              var lineEl = document.createElement("div");
              lineEl.className = "caption-line";
              lineWords.forEach(function (word) {
                var wordEl = document.createElement("span");
                wordEl.id = "caption-word-" + groupIndex + "-" + word.wordIndex;
                wordEl.className = "caption-word";
                wordEl.textContent = word.text.toLowerCase();
                lineEl.appendChild(wordEl);
              });
              copyEl.appendChild(lineEl);
            });
            pillEl.appendChild(copyEl);
            groupEl.appendChild(pillEl);
            stage.appendChild(groupEl);
          });
        }

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

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

        GROUPS.forEach(function (group, groupIndex) {
          var groupEl = document.getElementById("caption-group-" + groupIndex);
          var nextGroup = GROUPS[groupIndex + 1];
          var isLastGroup = groupIndex === GROUPS.length - 1;
          var effectiveEnd = isLastGroup
            ? DURATION
            : Math.min(nextGroup.start, group.end + GROUP_END_BUFFER);
          var visibleStart = Math.max(0, group.start);
          var visibleEnd = Math.max(visibleStart + 0.01, effectiveEnd);

          tl.set(groupEl, { opacity: 1 }, visibleStart);
          tl.set(groupEl, { opacity: 0 }, visibleEnd);

          group.words.forEach(function (word, wordIndex) {
            var wordEl = document.getElementById("caption-word-" + groupIndex + "-" + wordIndex);
            var isFirstWord = wordIndex === 0;
            var wordStart = Math.max(visibleStart, word.start - WORD_FADE_LEAD);
            tl.set(wordEl, { color: isFirstWord ? COLOR_ACTIVE : COLOR_INACTIVE }, visibleStart);
            if (isFirstWord) return;
            tl.to(
              wordEl,
              { color: COLOR_ACTIVE, duration: COLOR_FADE_DURATION, ease: "none" },
              wordStart,
            );
          });
        });

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

## Usage

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

Tagged `captions` `caption-style` `karaoke` `pill`.

## Related topics

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