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hyperframes/docs/catalog/components/caption-weight-shift.mdx
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miga-heygenandMiguel Ángel 7b5fdb1ad2 fix(docs): emit catalog source accordion titles as plain strings (#4006) 
The generated catalog pages rendered the "Source" accordion title as a
JSX expression, `<Accordion title={`name.html`}>`. Mintlify's search
indexer stringifies expression attribute nodes rather than evaluating
them, so every one of the 399 catalog pages surfaced its Source section
in search results as "[object Object]" (visible on the Scroll Feed page,
among others).

The template literal carried no escaping benefit: every title is a
single-segment `name.html` path, and a double-quoted JSX string handles
it directly. Introduce `mdxStringAttribute`, which emits a plain
`name="value"` attribute and escapes `& " < { }` as HTML character
references (MDX decodes references inside quoted attribute values, and
unlike JSON.stringify it does not rely on backslash escapes, which JSX
strings do not honour). Use it for both the Source accordion title and
the preview iframe title, and regenerate the catalog pages.

Regenerated with `npx tsx scripts/generate-catalog-pages.ts`; the only
change across the 399 pages is the one Accordion title line each.

Co-authored-by: Miguel Ángel <miguel.sierra@heygen.com>
2026-09-16 11:55:00 -04:00

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---
title: "Weight Shift"
description: "Elegant font-weight transition between caption lines"
---
import { InstallCommand } from "/snippets/install-command.jsx";
## Install
<InstallCommand command="npx hyperframes add caption-weight-shift" item="caption-weight-shift" />
That writes one file: `compositions/components/caption-weight-shift.html`.
<iframe
className="w-full aspect-video rounded-xl border-0 bg-zinc-100 dark:bg-zinc-800"
title="caption-weight-shift 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@latest/dist/hyperframes-player.global.js"><\/script></head><body><script>fetch("/public/catalog/components/caption-weight-shift.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-weight-shift.png");document.body.appendChild(p)});<\/script></body></html>`}
/>
## Source
<Accordion title="caption-weight-shift.html">
```html
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=1920, height=1080" />
<title>Weight Shift</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@300;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: "Montserrat", Arial, sans-serif;
}
#weight-shift {
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: 278px;
display: flex;
align-items: center;
justify-content: center;
}
.caption-group {
position: absolute;
left: 0;
top: 0;
width: 1400px;
height: 278px;
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: 12px;
width: max-content;
max-width: 1400px;
line-height: 1.1;
white-space: nowrap;
color: #ffffff;
font-family: "Montserrat", Arial, sans-serif;
font-weight: 300;
font-size: 72px;
letter-spacing: -0.03em;
text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
text-transform: lowercase;
}
</style>
</head>
<body>
<div
id="weight-shift"
data-composition-id="caption-weight-shift"
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 MAX_LINE_WIDTH = SAFE_ZONE_WIDTH - 40;
var CAPTION_FONT_SIZE = 72;
var MAX_WORDS_PER_GROUP = 4;
var WORD_SPACING = 12;
var PAUSE_THRESHOLD = 0.1;
var ENTRY_DURATION = 100 / 1000;
var WEIGHT_TRANSITION = 100 / 1000;
var FONT_WIDTH_SAFETY = 1.14;
var FONT_WEIGHT_LIGHT = 300;
var FONT_WEIGHT_BOLD = 700;
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) {
return {
text: String(item.word || item.text || "").trim(),
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 _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 measureCanvas = document.createElement("canvas");
var measureContext = measureCanvas.getContext("2d");
measureContext.font = "700 " + CAPTION_FONT_SIZE + "px Montserrat";
function measureWord(word) {
return measureContext.measureText(word.text.toLowerCase()).width * FONT_WIDTH_SAFETY;
}
function measureLineWidth(words) {
return words.reduce(function (total, word, index) {
return total + measureWord(word) + (index ? WORD_SPACING : 0);
}, 0);
}
function fitsInTwoLines(words) {
return measureLineWidth(words) <= MAX_LINE_WIDTH * 1.8;
}
function splitLines(words) {
if (words.length < 2) {
return [{ words: words, startIndex: 0 }];
}
var bestSplit = Math.ceil(words.length / 2);
var bestDiff = Infinity;
for (var s = 1; s < words.length; s++) {
var w1 = measureLineWidth(words.slice(0, s));
var w2 = measureLineWidth(words.slice(s));
if (w1 <= MAX_LINE_WIDTH && w2 <= MAX_LINE_WIDTH) {
var diff = Math.abs(w1 - w2);
if (diff < bestDiff) {
bestDiff = diff;
bestSplit = s;
}
}
}
var result = [];
var line1 = words.slice(0, bestSplit);
var line2 = words.slice(bestSplit);
if (line1.length) result.push({ words: line1, startIndex: 0 });
if (line2.length) result.push({ words: line2, startIndex: line1.length });
return result;
}
function avoidSingleWordGroups(groups) {
var out = [];
groups.forEach(function (group) {
if (
group.words.length === 1 &&
out.length > 0 &&
out[out.length - 1].words.length < MAX_WORDS_PER_GROUP
) {
out[out.length - 1] = makeGroup(out[out.length - 1].words.concat(group.words));
} else {
out.push(group);
}
});
for (var i = 0; i < out.length; i++) {
if (out[i].words.length !== 1) continue;
if (i + 1 < out.length && out[i + 1].words.length < MAX_WORDS_PER_GROUP) {
out[i] = makeGroup(out[i].words.concat(out[i + 1].words));
out.splice(i + 1, 1);
} else if (i > 0 && out[i - 1].words.length < MAX_WORDS_PER_GROUP) {
out[i - 1] = makeGroup(out[i - 1].words.concat(out[i].words));
out.splice(i, 1);
i--;
}
}
return out;
}
function makeGroups(words) {
var groups = [];
var current = [];
words.forEach(function (word, index) {
var nextWord = words[index + 1];
var testGroup = current.concat([word]);
if (testGroup.length > MAX_WORDS_PER_GROUP || !fitsInTwoLines(testGroup)) {
if (current.length) groups.push(makeGroup(current));
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));
current = [];
}
});
if (current.length) groups.push(makeGroup(current));
return avoidSingleWordGroups(groups);
}
function makeGroup(words) {
return {
words: words.slice(),
lines: splitLines(words),
start: words[0].start,
end: words[words.length - 1].end,
};
}
function buildCaptions(groups) {
var stage = document.getElementById("caption-stage");
groups.forEach(function (group, groupIndex) {
var groupText = group.words
.map(function (w) {
return w.text.toLowerCase();
})
.join(" ");
var computedSize = fitFontSize(
groupText,
CAPTION_FONT_SIZE,
"700",
"Montserrat",
MAX_LINE_WIDTH,
);
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.forEach(function (line, lineIndex) {
var lineEl = document.createElement("div");
lineEl.className = "caption-line";
lineEl.id = "caption-group-" + groupIndex + "-line-" + lineIndex;
lineEl.style.fontWeight = lineIndex === 0 ? FONT_WEIGHT_BOLD : FONT_WEIGHT_LIGHT;
lineEl.style.fontSize = computedSize + "px";
line.words.forEach(function (word, wordIndex) {
var wordEl = document.createElement("span");
wordEl.textContent = word.text.toLowerCase();
wordEl.style.display = "inline-block";
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;
allGroupEls.forEach(function (otherEl, otherIndex) {
if (otherIndex !== groupIndex) tl.set(otherEl, { opacity: 0 }, visibleStart);
});
tl.set(groupEl, { opacity: 0, scale: 0.85 }, visibleStart);
tl.to(
groupEl,
{ opacity: 1, scale: 1, duration: ENTRY_DURATION, ease: "power3.out", force3D: true },
visibleStart,
);
if (group.lines.length === 2) {
var line1El = document.getElementById("caption-group-" + groupIndex + "-line-0");
var line2El = document.getElementById("caption-group-" + groupIndex + "-line-1");
var line2FirstWord = group.lines[1].words[0];
var switchTime = line2FirstWord.start;
tl.to(
line1El,
{ fontWeight: FONT_WEIGHT_LIGHT, duration: WEIGHT_TRANSITION, ease: "power2.out" },
switchTime,
);
tl.to(
line2El,
{ fontWeight: FONT_WEIGHT_BOLD, duration: WEIGHT_TRANSITION, ease: "power2.out" },
switchTime,
);
}
tl.set(groupEl, { opacity: 0 }, visibleEnd);
});
window.__timelines["caption-weight-shift"] = tl;
</script>
</body>
</html>
```
</Accordion>
## Usage
Open `compositions/components/caption-weight-shift.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` `minimal` `typography`.
## 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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