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hyperframes/docs/catalog/components/caption-neon-accent.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: "Neon Accent"
description: "Multi-color neon glow accents with wiggle drift animation"
---
import { InstallCommand } from "/snippets/install-command.jsx";
## Install
<InstallCommand command="npx hyperframes add caption-neon-accent" item="caption-neon-accent" />
That writes one file: `compositions/components/caption-neon-accent.html`.
<iframe
className="w-full aspect-video rounded-xl border-0 bg-zinc-100 dark:bg-zinc-800"
title="caption-neon-accent 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-neon-accent.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-neon-accent.png");document.body.appendChild(p)});<\/script></body></html>`}
/>
## Source
<Accordion title="caption-neon-accent.html">
```html
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=1920, height=1080" />
<title>Neon Accent</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;
font-family: "Montserrat", Arial, sans-serif;
}
#neon-accent {
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: 260px;
display: flex;
align-items: center;
justify-content: center;
}
.caption-group {
position: absolute;
left: 0;
top: 0;
width: 1400px;
height: 260px;
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: 16px;
width: max-content;
max-width: 1400px;
line-height: 1.1;
white-space: nowrap;
}
.caption-word {
display: inline-block;
color: #ffffff;
font-family: "Montserrat", Arial, sans-serif;
font-weight: 800;
font-size: 88px;
line-height: 1.1;
letter-spacing: 0;
text-transform: uppercase;
}
.caption-word.accent {
font-size: 106px;
}
</style>
</head>
<body>
<div
id="neon-accent"
data-composition-id="caption-neon-accent"
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 BASE_FONT_SIZE = 88;
var ACCENT_FONT_SIZE = 106;
var MIN_FONT_SIZE = 62;
var MAX_WORDS_PER_GROUP = 4;
var WORD_SPACING = 16;
var PAUSE_THRESHOLD = 0.1;
var ENTRY_DURATION = 7 / 30;
var WIGGLE_DISTANCE = 14;
var WIGGLE_CYCLE = 2 / 1.3;
var FONT_WIDTH_SAFETY = 1.14;
var PRIMARY_COLOR = "#FFFFFF";
var ACCENT_COLORS = ["#53FF01", "#FF0002", "#FCFF00"];
var TRANSITION_WORDS = new Set([
"the",
"a",
"an",
"and",
"or",
"but",
"is",
"are",
"was",
"were",
"to",
"of",
"in",
"on",
"at",
"for",
"with",
"by",
"from",
"as",
"it",
"its",
"this",
"that",
"these",
"those",
"be",
"been",
"have",
"has",
"had",
"do",
"does",
"did",
"will",
"would",
"could",
"should",
"may",
"might",
"must",
"can",
"if",
"then",
"so",
"just",
"not",
"no",
"yes",
"up",
"out",
"about",
"lets",
"you",
"write",
"render",
]);
var KEYWORDS = new Set(["hyperframes", "html", "professional", "code", "cinema"]);
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 },
];
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;
}
gsap.registerPlugin && gsap.registerPlugin();
function cleanText(text) {
return String(text || "").trim();
}
function normalizeWords(rawWords) {
return rawWords
.map(function (item) {
return {
text: cleanText(item.word || item.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 (word) {
return word.text.length > 0;
});
}
var measureCanvas = document.createElement("canvas");
var measureContext = measureCanvas.getContext("2d");
function seededRandom(seed) {
var x = Math.sin(seed * 9999) * 10000;
return x - Math.floor(x);
}
function isKeyword(text) {
return KEYWORDS.has(text.toLowerCase().replace(/[^a-z]/g, ""));
}
function assignWordColors(words, groupIndex) {
return words.map(function (word) {
if (isKeyword(word.text)) {
var colorIndex = Math.floor(seededRandom(groupIndex * 23 + 7) * ACCENT_COLORS.length);
return ACCENT_COLORS[colorIndex];
}
var clean = word.text.toLowerCase().replace(/[^a-z']/g, "");
if (TRANSITION_WORDS.has(clean)) return PRIMARY_COLOR;
var rand = seededRandom(groupIndex * 7 + words.indexOf(word));
if (rand > 0.6) {
var ci = Math.floor(rand * ACCENT_COLORS.length) % ACCENT_COLORS.length;
return ACCENT_COLORS[ci];
}
return PRIMARY_COLOR;
});
}
function measureWord(word, color, fontSize) {
var size = color === PRIMARY_COLOR ? fontSize : fontSize * 1.2;
measureContext.font = "800 " + size + "px Montserrat";
return measureContext.measureText(word.text.toUpperCase()).width * FONT_WIDTH_SAFETY;
}
function measureLineWidth(words, colors, fontSize) {
return words.reduce(function (total, word, index) {
return (
total +
measureWord(word, colors[index] || PRIMARY_COLOR, fontSize) +
(index ? WORD_SPACING : 0)
);
}, 0);
}
function splitLinesForGroup(words, colors, fontSize) {
var maxLineWidth = SAFE_ZONE_WIDTH;
if (
words.some(function (word, i) {
return measureWord(word, colors[i] || PRIMARY_COLOR, fontSize) > maxLineWidth;
})
)
return null;
if (measureLineWidth(words, colors, fontSize) <= maxLineWidth)
return [{ words: words, colors: colors }];
var best = null;
var bestDiff = Infinity;
for (var split = 1; split < words.length; split++) {
var fw = words.slice(0, split),
sw = words.slice(split);
var fc = colors.slice(0, split),
sc = colors.slice(split);
var fW = measureLineWidth(fw, fc, fontSize);
var sW = measureLineWidth(sw, sc, fontSize);
if (fW <= maxLineWidth && sW <= maxLineWidth) {
var diff = Math.abs(fW - sW);
if (diff < bestDiff) {
best = [
{ words: fw, colors: fc },
{ words: sw, colors: sc },
];
bestDiff = diff;
}
}
}
return best;
}
function makeGroups(words) {
var groups = [];
var current = [];
words.forEach(function (word, index) {
var nextWord = words[index + 1];
var testGroup = current.concat([word]);
var exceedsWords = testGroup.length > MAX_WORDS_PER_GROUP;
var colors = assignWordColors(testGroup, groups.length);
var exceedsFit = !splitLinesForGroup(testGroup, colors, BASE_FONT_SIZE);
if (exceedsWords || exceedsFit) {
if (current.length) groups.push(makeGroup(current, groups.length));
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, groups.length));
current = [];
}
});
if (current.length) groups.push(makeGroup(current, groups.length));
return groups;
}
function makeGroup(words, groupIndex) {
var colors = assignWordColors(words, groupIndex);
var groupText = words
.map(function (w) {
return w.text.toUpperCase();
})
.join(" ");
var fontSize = fitFontSize(groupText, BASE_FONT_SIZE, "800", "Montserrat", SAFE_ZONE_WIDTH);
while (fontSize > MIN_FONT_SIZE && !splitLinesForGroup(words, colors, fontSize)) {
fontSize -= 2;
}
return {
words: words.slice(),
colors: colors,
fontSize: fontSize,
lines: splitLinesForGroup(words, colors, fontSize) || [{ words: words, colors: colors }],
start: words[0].start,
end: words[words.length - 1].end,
};
}
function shadowForColor(color) {
var hex = color.replace("#", "");
var r = parseInt(hex.slice(0, 2), 16);
var g = parseInt(hex.slice(2, 4), 16);
var b = parseInt(hex.slice(4, 6), 16);
var glow =
"0 0 4px rgba(" +
r +
"," +
g +
"," +
b +
",1), 0 0 10px rgba(" +
r +
"," +
g +
"," +
b +
",0.9), 0 0 20px rgba(" +
r +
"," +
g +
"," +
b +
",0.7), 0 0 40px rgba(" +
r +
"," +
g +
"," +
b +
",0.4)";
return "0 8px 16px rgba(0,0,0,0.8), 0 16px 40px rgba(0,0,0,0.6), " + glow;
}
function buildCaptions(groups) {
var stage = document.getElementById("caption-stage");
groups.forEach(function (group, groupIndex) {
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.slice(0, 2).forEach(function (line) {
var lineEl = document.createElement("div");
lineEl.className = "caption-line";
line.words.forEach(function (word, wordIndex) {
var color = line.colors[wordIndex] || PRIMARY_COLOR;
var wordEl = document.createElement("span");
wordEl.className = color === PRIMARY_COLOR ? "caption-word" : "caption-word accent";
wordEl.textContent = word.text.toUpperCase();
wordEl.style.color = color;
wordEl.style.fontSize =
color === PRIMARY_COLOR ? group.fontSize + "px" : group.fontSize * 1.2 + "px";
wordEl.style.textShadow = shadowForColor(color);
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;
var direction = groupIndex % 2 === 0 ? -1 : 1;
var D = WIGGLE_DISTANCE * direction;
var wiggleCycles = Math.max(1, Math.ceil((visibleEnd - visibleStart) / WIGGLE_CYCLE));
allGroupEls.forEach(function (otherEl, otherIndex) {
if (otherIndex !== groupIndex) tl.set(otherEl, { opacity: 0 }, visibleStart);
});
tl.set(groupEl, { opacity: 0, scale: 0.65, x: 0, y: 0 }, visibleStart);
tl.to(
groupEl,
{ opacity: 1, scale: 1, duration: ENTRY_DURATION, ease: "power3.out", force3D: true },
visibleStart,
);
tl.to(
groupEl,
{
x: D,
y: D,
duration: WIGGLE_CYCLE / 2,
ease: "sine.inOut",
yoyo: true,
repeat: Math.max(0, wiggleCycles * 2 - 1),
force3D: true,
},
visibleStart,
);
tl.set(groupEl, { opacity: 0 }, visibleEnd);
});
window.__timelines["caption-neon-accent"] = tl;
</script>
</body>
</html>
```
</Accordion>
## Usage
Open `compositions/components/caption-neon-accent.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` `neon` `glow` `accent`.
## 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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