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hyperframes/docs/catalog/components/caption-highlight.mdx
T
Miguel Ángel 9734578e60 feat(registry): bring back the video-primitive moves (#3169) 
Restores the 208 catalog items reverted after their previews 404'd in
production, this time on the payload mechanism rather than the .html files
that caused the outage.

The generator no longer writes a preview document to docs/public. That writer,
and the machinery under it, existed only to produce files the docs host
discards, so it is gone rather than bypassed. Items now embed the composition
itself via a payload, which is what the previous change already does for the
items that were already in the catalog.

The variables explorer is parked, not restored: it drove its preview through
the same unpublished .html path, so it would have shown an empty frame. Items
that declare variables get the live player plus the static variables table, and
reconnecting the explorer to payloads is a follow-up.
2026-08-10 18:46:03 -04:00

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---
title: "Highlight"
description: "Red background sweep behind each active word, TikTok-style"
---
import { InstallCommand } from "/snippets/install-command.jsx";
<iframe
className="w-full aspect-video rounded-xl border-0 bg-zinc-100 dark:bg-zinc-800"
title="caption-highlight 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-highlight.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-highlight.png");document.body.appendChild(p)});<\/script></body></html>`}
/>
## Install
<InstallCommand command="npx hyperframes add caption-highlight" />
That writes one file: `compositions/components/caption-highlight.html`.
## Source
<Accordion title={`caption-highlight.html`}>
```html
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=1920, height=1080" />
<title>Highlight</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;
}
#highlight {
pointer-events: none;
position: relative;
width: 1920px;
height: 1080px;
overflow: hidden;
background: transparent;
}
#hl-video {
position: absolute;
inset: 0;
z-index: 0;
width: 100%;
height: 100%;
object-fit: cover;
}
.hl-overlay {
position: absolute;
inset: 0;
background: transparent;
z-index: 1;
pointer-events: none;
}
#hl-container {
position: absolute;
inset: 0;
z-index: 10;
pointer-events: none;
}
.hl-group {
position: absolute;
bottom: 140px;
left: 0;
width: 100%;
display: flex;
flex-wrap: wrap;
align-items: flex-end;
justify-content: center;
gap: 8px;
padding: 0 100px;
opacity: 0;
visibility: hidden;
}
.hl-word {
font-family: "Montserrat", sans-serif;
font-weight: 800;
font-size: 80px;
text-transform: uppercase;
color: #ffffff;
display: inline-block;
letter-spacing: 0.02em;
line-height: 1;
position: relative;
padding: 6px 12px 8px;
text-shadow: 0 6px 18px rgba(0, 0, 0, 0.45);
transform-origin: 50% 58%;
will-change: transform, filter;
}
.hl-word-bg {
position: absolute;
inset: 0;
background: linear-gradient(135deg, #ff1745 0%, #df1238 100%);
border-radius: 10px;
box-shadow: 0 12px 30px rgba(229, 20, 58, 0.32);
opacity: 0;
transform: scaleX(0);
transform-origin: 0% 50%;
z-index: -1;
}
.hl-word-text {
position: relative;
z-index: 1;
}
</style>
</head>
<body>
<div
id="highlight"
data-composition-id="caption-highlight"
data-timeline-locked
data-start="0"
data-duration="8"
data-fps="30"
data-width="1920"
data-height="1080"
>
<div class="hl-overlay"></div>
<div id="hl-container"></div>
</div>
<script>
(function () {
window.__timelines = window.__timelines || {};
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 WORDS = [
{ 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 RAW_GROUPS = [
[0, 3],
[4, 7],
[8, 8],
[9, 12],
[13, 15],
[16, 16],
[17, 19],
[20, 22],
[23, 24],
[25, 27],
];
var GROUPS = RAW_GROUPS.map(function (pair, gi) {
var ws = pair[0],
we = pair[1];
var nextStart = gi + 1 < RAW_GROUPS.length ? WORDS[RAW_GROUPS[gi + 1][0]].start : 8.0;
var gEnd = Math.min(WORDS[we].end + 0.5, nextStart - 0.05);
return { wordStart: ws, wordEnd: we, start: WORDS[ws].start, end: gEnd };
});
var container = document.getElementById("hl-container");
var tl = gsap.timeline({ paused: true });
GROUPS.forEach(function (g, gi) {
var groupWords = WORDS.slice(g.wordStart, g.wordEnd + 1);
var grp = document.createElement("div");
grp.className = "hl-group";
grp.id = "hl-grp-" + gi;
var groupText = groupWords
.map(function (w) {
return w.text.toUpperCase();
})
.join(" ");
var computedSize = fitFontSize(groupText, 80, "800", "Montserrat", 1620);
groupWords.forEach(function (w, i) {
var wi = g.wordStart + i;
var wordEl = document.createElement("span");
wordEl.className = "hl-word";
wordEl.id = "hl-w-" + wi;
wordEl.style.fontSize = computedSize + "px";
var bgEl = document.createElement("span");
bgEl.className = "hl-word-bg";
bgEl.id = "hl-bg-" + wi;
var textEl = document.createElement("span");
textEl.className = "hl-word-text";
textEl.textContent = w.text.toUpperCase();
wordEl.appendChild(bgEl);
wordEl.appendChild(textEl);
grp.appendChild(wordEl);
});
container.appendChild(grp);
tl.set(grp, { visibility: "visible" }, g.start);
tl.fromTo(
grp,
{ opacity: 0 },
{ opacity: 1, duration: 0.12, ease: "power2.out" },
g.start,
);
groupWords.forEach(function (w, i) {
var wi = g.wordStart + i;
var bgEl = document.getElementById("hl-bg-" + wi);
var wordEl = document.getElementById("hl-w-" + wi);
tl.to(bgEl, { opacity: 1, scaleX: 1, duration: 0.15, ease: "power2.out" }, w.start);
tl.to(
wordEl,
{ filter: "brightness(1.05)", duration: 0.08, ease: "power2.out" },
w.start,
);
tl.to(
wordEl,
{ filter: "brightness(1)", duration: 0.16, ease: "power2.out" },
w.start + 0.08,
);
tl.to(bgEl, { opacity: 0, scaleX: 1.02, duration: 0.1, ease: "power2.in" }, w.end);
tl.set(bgEl, { scaleX: 0 }, w.end + 0.1);
});
tl.to(grp, { opacity: 0, duration: 0.1, ease: "power2.in" }, g.end - 0.1);
tl.set(grp, { opacity: 0, visibility: "hidden" }, g.end);
});
tl.seek(0);
window.__timelines["caption-highlight"] = tl;
})();
</script>
</body>
</html>
```
</Accordion>
## Usage
Open `compositions/components/caption-highlight.html` and paste its contents into your composition. See the comment header in the file for detailed instructions.
{/* hf:generated-footer */}
Tagged `captions` `caption-style` `highlight` `social` `tiktok`.
## Related topics
- [Browse the complete Catalog](/catalog)
- [Add assets and Catalog items in Studio](/studio/assets-and-blocks)
- [Build a richer composition](/go-further)
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