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hyperframes/docs/catalog/components/caption-weight-shift.mdx
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Miguel Ángel d7688f9943 fix(docs): load the player from latest, not a pinned minor (#3320) 
* fix(docs): load the player from latest, not a pinned minor

The catalog pages pinned the player CDN URL to a minor line, and that pin
sat one line behind after the last release. Every page kept rendering, on
the older build, so nothing surfaced it: the only symptom was that a fix
published to npm never appeared on the docs.

The generator derived its pin from the player's package.json, which is
correct only if every page is regenerated on the release that moves it.
That is the step that did not happen, and it has to happen across 175
generated pages plus three hand-written files for the pin to be true.

A version carried in step across 178 places will be stale, and stale here
is silent. Ask for latest instead and there is nothing to carry.

This costs the ability to hold the docs back from a bad player release.
Paid deliberately: the pin did not buy that either, it only delayed the
good releases too.

A test asserts no pinned version comes back, and fails if it stops finding
the references at all, so it cannot pass by matching nothing.

* refactor(scripts): list tracked files instead of walking the tree

The pin guard hand-rolled a recursive directory walk with its own skip
list and size cap, which the audit flagged: helpers living in a test file
earn no coverage, so their complexity lands straight on the CRAP score.

git already knows which files to read, and ignores node_modules and build
output for us, so one call replaces the walker and both findings go away.
2026-08-17 21:11:12 -04:00

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---
title: "Weight Shift"
description: "Elegant font-weight transition between caption lines"
---
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-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>`}
/>
## Install
<InstallCommand command="npx hyperframes add caption-weight-shift" item="caption-weight-shift" />
That writes one file: `compositions/components/caption-weight-shift.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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