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hyperframes/docs/catalog/components/caption-editorial-emphasis.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: "Editorial Emphasis"
description: "Dual-font system with dramatic size contrast for emphasis words"
---
import { InstallCommand } from "/snippets/install-command.jsx";
## Install
<InstallCommand command="npx hyperframes add caption-editorial-emphasis" item="caption-editorial-emphasis" />
That writes one file: `compositions/components/caption-editorial-emphasis.html`.
<iframe
className="w-full aspect-video rounded-xl border-0 bg-zinc-100 dark:bg-zinc-800"
title="caption-editorial-emphasis 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-editorial-emphasis.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-editorial-emphasis.png");document.body.appendChild(p)});<\/script></body></html>`}
/>
## Source
<Accordion title="caption-editorial-emphasis.html">
```html
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=1920, height=1080" />
<title>Editorial Emphasis</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=Inter:wght@400&family=Playfair+Display:ital,wght@0,800;1,800&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: "Inter", sans-serif;
}
#editorial-emphasis {
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;
top: 580px;
left: 60px;
width: 1800px;
height: 430px;
display: flex;
align-items: flex-start;
justify-content: flex-start;
}
.caption-block {
position: absolute;
left: 0;
top: 0;
opacity: 0;
transform-origin: 0% 0%;
will-change: transform, opacity;
backface-visibility: hidden;
}
.caption-line {
display: flex;
align-items: baseline;
gap: 14px;
line-height: 1.1;
white-space: nowrap;
}
.caption-line + .caption-line {
margin-top: 8px;
}
.word {
display: inline-block;
color: #f5f0d0;
text-shadow:
0 2px 12px rgba(0, 0, 0, 0.6),
0 4px 24px rgba(0, 0, 0, 0.35);
will-change: transform, opacity;
backface-visibility: hidden;
}
.word--normal {
font-family: "Inter", sans-serif;
font-size: 86px;
font-weight: 400;
font-style: normal;
}
.word--italic {
font-family: "Inter", sans-serif;
font-size: 86px;
font-weight: 400;
font-style: italic;
}
.word--emphasis {
font-family: "Playfair Display", serif;
font-size: 180px;
font-weight: 800;
font-style: italic;
line-height: 0.9;
color: #f5f0d0;
}
</style>
</head>
<body>
<div
id="editorial-emphasis"
data-composition-id="caption-editorial-emphasis"
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_WIDTH = 1800;
var ENTRY_DUR = 0.1;
var SLIDE_DUR = 0.2;
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;
}
// Generic transcript words
var W = [
{ 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 },
];
// Block layout: [wordIndex, type] — n=normal, i=italic, e=emphasis(large)
// Emphasis words: HyperFrames(8), HTML(12), professional(15), code(24), cinema.(27)
var BLOCKS = [
{
line1: [
[0, "n"],
[1, "n"],
[2, "n"],
],
line2: [
[3, "n"],
[4, "n"],
],
},
{
line1: [
[5, "n"],
[6, "n"],
],
line2: [[7, "e"]],
},
{ line1: [[8, "e"]], line2: null },
{
line1: [
[9, "n"],
[10, "n"],
[11, "n"],
],
line2: [[12, "e"]],
},
{
line1: [
[13, "n"],
[14, "n"],
],
line2: [[15, "e"]],
},
{
line1: [
[16, "n"],
[17, "n"],
],
line2: null,
},
{
line1: [[18, "n"]],
line2: [
[19, "n"],
[20, "n"],
],
},
{
line1: [
[21, "n"],
[22, "n"],
],
line2: null,
},
{
line1: [
[23, "i"],
[24, "e"],
],
line2: null,
},
{
line1: [
[25, "n"],
[26, "n"],
],
line2: [[27, "e"]],
},
];
var CLASS_MAP = { n: "word word--normal", i: "word word--italic", e: "word word--emphasis" };
function computeLineSize(linePairs) {
var hasEmphasis = linePairs.some(function (p) {
return p[1] === "e";
});
if (hasEmphasis) {
var lineText = linePairs
.map(function (p) {
return W[p[0]].text;
})
.join(" ");
return fitFontSize(lineText, 180, "800", "Playfair Display", SAFE_WIDTH);
}
var lineText = linePairs
.map(function (p) {
return W[p[0]].text;
})
.join(" ");
return fitFontSize(lineText, 86, "400", "Inter", SAFE_WIDTH);
}
function buildBlocks() {
var stage = document.getElementById("caption-stage");
BLOCKS.forEach(function (block, bi) {
var el = document.createElement("div");
el.className = "caption-block";
el.id = "b" + bi;
var l1Size = computeLineSize(block.line1);
var l1 = document.createElement("div");
l1.className = "caption-line";
l1.id = "b" + bi + "L1";
block.line1.forEach(function (pair, wi) {
var span = document.createElement("span");
span.className = CLASS_MAP[pair[1]];
span.id = "b" + bi + "L1w" + wi;
span.textContent = W[pair[0]].text;
if (pair[1] === "e") {
span.style.fontSize = l1Size + "px";
} else {
span.style.fontSize = l1Size + "px";
}
l1.appendChild(span);
});
el.appendChild(l1);
if (block.line2) {
var l2Size = computeLineSize(block.line2);
var l2 = document.createElement("div");
l2.className = "caption-line";
l2.id = "b" + bi + "L2";
block.line2.forEach(function (pair, wi) {
var span = document.createElement("span");
span.className = CLASS_MAP[pair[1]];
span.id = "b" + bi + "L2w" + wi;
span.textContent = W[pair[0]].text;
if (pair[1] === "e") {
span.style.fontSize = l2Size + "px";
} else {
span.style.fontSize = l2Size + "px";
}
l2.appendChild(span);
});
el.appendChild(l2);
}
stage.appendChild(el);
});
}
buildBlocks();
// Scale blocks that exceed safe width
(function fitBlocks() {
BLOCKS.forEach(function (block, bi) {
var el = document.getElementById("b" + bi);
el.style.opacity = "1";
el.style.position = "relative";
var lines = el.querySelectorAll(".caption-line");
var maxW = 0;
lines.forEach(function (line) {
if (line.scrollWidth > maxW) maxW = line.scrollWidth;
});
if (maxW > SAFE_WIDTH) {
var s = SAFE_WIDTH / maxW;
el.style.transform = "scale(" + s + ")";
}
el.style.opacity = "0";
el.style.position = "";
});
})();
window.__timelines = window.__timelines || {};
var tl = gsap.timeline({ paused: true });
var allEls = BLOCKS.map(function (_, i) {
return document.getElementById("b" + i);
});
function blockStart(bi) {
return W[BLOCKS[bi].line1[0][0]].start;
}
BLOCKS.forEach(function (block, bi) {
var el = allEls[bi];
var start = blockStart(bi);
var nextStart = bi < BLOCKS.length - 1 ? blockStart(bi + 1) : DURATION;
allEls.forEach(function (other, oi) {
if (oi !== bi) tl.set(other, { opacity: 0 }, start);
});
tl.set(el, { opacity: 1 }, start);
block.line1.forEach(function (pair, wi) {
var wordEl = document.getElementById("b" + bi + "L1w" + wi);
var wordStart = W[pair[0]].start;
tl.set(wordEl, { opacity: 0, scale: 1.12, transformOrigin: "0% 100%" }, start);
tl.to(
wordEl,
{ opacity: 1, scale: 1, duration: ENTRY_DUR, ease: "power2.out" },
wordStart,
);
});
if (block.line2) {
var hasEmphasis = block.line2.some(function (p) {
return p[1] === "e";
});
var l2El = document.getElementById("b" + bi + "L2");
if (hasEmphasis) {
var l2Start = W[block.line2[0][0]].start;
tl.set(l2El, { opacity: 0, x: -1920 }, start);
tl.to(l2El, { opacity: 1, x: 0, duration: SLIDE_DUR, ease: "power2.out" }, l2Start);
} else {
tl.set(l2El, { opacity: 1 }, start);
block.line2.forEach(function (pair, wi) {
var wordEl = document.getElementById("b" + bi + "L2w" + wi);
var wordStart = W[pair[0]].start;
tl.set(wordEl, { opacity: 0, scale: 1.12, transformOrigin: "0% 100%" }, start);
tl.to(
wordEl,
{ opacity: 1, scale: 1, duration: ENTRY_DUR, ease: "power2.out" },
wordStart,
);
});
}
}
tl.set(el, { opacity: 0 }, nextStart);
});
tl.to({}, { duration: DURATION }, 0);
window.__timelines["caption-editorial-emphasis"] = tl;
</script>
</body>
</html>
```
</Accordion>
## Usage
Open `compositions/components/caption-editorial-emphasis.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` `editorial` `typography` `emphasis`.
## 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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