Install
That writes one file:compositions/components/marker-highlight.html.
Variables
Every one of these has a default, so the piece works untouched. Set the ones you want to change on the element:| Variable | Default | Accepts | What it does |
|---|---|---|---|
text | Ship it with confidence | string | Full line of display text. |
emphasis_word | confidence | string | First case-insensitive substring match in text receives the marker. Empty or unmatched draws no marker. |
style | highlight | highlight, circle, underline, scribble | Shape of the hand-drawn marker stroke. |
draw_at | 0.9 | number | Second (from mount start) the marker starts drawing. Clamped so the stroke completes before any exit. |
accent | green | green, blue, violet | Marker ink color from the contract token map. |
exit | none | none, fade, up | Optional departure. Default none: the lockup holds until the frame cuts. |
data-variable-values on the element that mounts it. These are the
defaults, so this behaves exactly like the preview above until you change one:
<div
data-composition-id="marker-highlight"
data-composition-src="compositions/components/marker-highlight.html"
data-variable-values='{"text":"Ship it with confidence","emphasis_word":"confidence","style":"highlight","draw_at":0.9,"accent":"green","exit":"none"}'
></div>
Source
marker-highlight.html
marker-highlight.html
<!doctype html>
<!--
marker-highlight: HyperFrames video primitive (typography / emphasis)
The corpus emphasis unit: a short line of display text settles in, then ONE
hand-drawn marker stroke draws over the emphasized word on cue. Four marker
styles share the same mechanic: an SVG path revealed by a getTotalLength
dash tween (never the pathLength attribute, never non-scaling-stroke on a
dashed path; the anisotropic viewBox stretch is what gives the ink its
hand-swiped weight).
Variables:
text (string): the full line.
emphasis_word (string): first case-insensitive substring match inside
text gets the marker. Empty or unmatched renders the line with no
marker. Keep it a word or short phrase; it stays on one line.
style (highlight | circle | underline | scribble): marker shape.
draw_at (seconds): cue for the draw, relative to mount start. Clamped so
the stroke always completes before any exit begins.
accent (green | blue | violet): ink color via the contract token map.
exit (none | fade | up, default none): frame roots own transitions;
holds end films.
Envelope, fixed IN and OUT with elastic HOLD only (never time-scaled):
IN_BASE = 0.55s text rises into place
DRAW_BASE = 0.60s marker stroke, anchored at draw_at, plus a small
settle pop on the emphasized word
HOLD = max(0, D - phases), completely still
OUT_BASE = 0s for exit none, otherwise 0.45s
If D is shorter than the fixed phases, they compress together.
Mount contract: the runtime clones only this template. #root fills the host
box, establishes the container query basis, has no data-width or
data-height, and registers one paused timeline under the literal
marker-highlight key.
-->
<html
lang="en"
data-composition-id="marker-highlight"
data-composition-duration="3.5"
data-composition-variables='[
{ "id": "text", "type": "string", "role": "content", "label": "Text", "description": "Full line of display text.", "default": "Ship it with confidence" },
{ "id": "emphasis_word", "type": "string", "role": "content", "label": "Emphasis word", "description": "First case-insensitive substring match in text receives the marker. Empty or unmatched draws no marker.", "default": "confidence" },
{ "id": "style", "type": "enum", "role": "style", "label": "Marker style", "description": "Shape of the hand-drawn marker stroke.", "default": "highlight", "options": [{ "value": "highlight", "label": "Highlight" }, { "value": "circle", "label": "Circle" }, { "value": "underline", "label": "Underline" }, { "value": "scribble", "label": "Scribble" }] },
{ "id": "draw_at", "type": "number", "role": "timing", "label": "Draw at", "description": "Second (from mount start) the marker starts drawing. Clamped so the stroke completes before any exit.", "default": 0.9, "min": 0, "step": 0.1, "unit": "s" },
{ "id": "accent", "type": "enum", "role": "style", "label": "Accent", "description": "Marker ink color from the contract token map.", "default": "green", "options": [{ "value": "green", "label": "Green" }, { "value": "blue", "label": "Blue" }, { "value": "violet", "label": "Violet" }] },
{ "id": "exit", "type": "enum", "role": "timing", "label": "Exit", "description": "Optional departure. Default none: the lockup holds until the frame cuts.", "default": "none", "options": [{ "value": "none", "label": "None" }, { "value": "fade", "label": "Fade" }, { "value": "up", "label": "Up" }] }
]'
>
<head>
<meta charset="UTF-8" />
<title>Marker Highlight</title>
</head>
<body>
<template>
<div id="root" data-composition-id="marker-highlight" data-duration="3.5" data-fps="30">
<style>
*,
*::before,
*::after {
box-sizing: border-box;
}
#root {
position: absolute;
inset: 0;
overflow: hidden;
container-type: size;
isolation: isolate;
background: var(--bg, #0b0c0e);
color: var(--fg, #f8fafc);
font-family: var(--font-display, Inter, system-ui, sans-serif);
pointer-events: none;
}
.mh-clip {
position: absolute;
inset: 0;
display: grid;
place-items: center;
overflow: hidden;
}
.mh-stage {
max-width: 86cqw;
text-align: center;
will-change: transform, opacity;
}
.mh-text {
margin: 0;
font-size: var(--mh-font-size, min(8cqw, 15cqh));
font-weight: 600;
line-height: 1.14;
letter-spacing: -0.03em;
}
.mh-em {
position: relative;
display: inline-block;
white-space: nowrap;
will-change: transform;
}
.mh-em-text {
position: relative;
z-index: 1;
}
.mh-mark {
position: absolute;
z-index: 0;
overflow: visible;
}
/* Per-style marker box around the emphasized word. Explicit
width/height (svg is a replaced element: inset-stretching would
fall back to its intrinsic viewBox ratio); then
preserveAspectRatio="none" stretches the authored path (and its
stroke) into the box, which is exactly the marker-nib distortion
we want on a dashed path. */
.mh-em[data-marker-style="highlight"] .mh-mark {
left: -3%;
top: 14%;
width: 106%;
height: 76%;
}
.mh-em[data-marker-style="underline"] .mh-mark {
left: -2%;
bottom: -14%;
width: 105%;
height: 22%;
z-index: 2;
}
.mh-em[data-marker-style="circle"] .mh-mark {
left: -13%;
top: -26%;
width: 126%;
height: 152%;
z-index: 2;
}
.mh-em[data-marker-style="scribble"] .mh-mark {
left: -2%;
top: 12%;
width: 104%;
height: 76%;
z-index: 2;
}
</style>
<div
id="marker-highlight-clip"
class="mh-clip clip"
data-start="0"
data-duration="3.5"
data-track-index="0"
>
<div class="mh-stage">
<p class="mh-text"></p>
</div>
</div>
<script src="https://cdn.jsdelivr.net/npm/gsap@3.14.2/dist/gsap.min.js"></script>
<script>
(function () {
"use strict";
var root = document.getElementById("root");
// Literal key: the flattening step strips data-composition-id off
// the mounted root, so reading it back would register "null".
var compositionId = "marker-highlight";
var stage = root.querySelector(".mh-stage");
var textEl = root.querySelector(".mh-text");
var vars =
window.__hyperframes && window.__hyperframes.getVariables
? window.__hyperframes.getVariables()
: {};
var text =
vars.text == null
? "Ship it with confidence"
: String(vars.text).trim().replace(/\s+/g, " ");
var emphasis =
vars.emphasis_word == null
? "confidence"
: String(vars.emphasis_word).trim().replace(/\s+/g, " ");
var accentColors = {
green: "var(--brand, #71f5a7)",
blue: "var(--accent, #61a8ff)",
violet: "var(--accent-2, #c5a3ff)",
};
var accent = Object.prototype.hasOwnProperty.call(accentColors, vars.accent)
? vars.accent
: "green";
var exit = vars.exit === "fade" || vars.exit === "up" ? vars.exit : "none";
// Hand-drawn stroke library. Paths are authored in a fixed viewBox
// and stretched into the word box; wobble is baked into the
// control points, never randomized.
var markerStyles = {
highlight: {
viewBox: "0 0 100 40",
d: "M 3 24 C 22 20.5, 47 25.5, 68 22.5 C 79 21, 90 23, 97 21.5",
strokeWidth: 26,
opacity: 0.5,
},
circle: {
viewBox: "0 0 100 40",
d: "M 22 7 C 58 1, 95 8, 97 20 C 99 31, 74 38, 44 37 C 16 36, 2 29, 3 19 C 4 10, 22 4, 52 4.5",
strokeWidth: 2.8,
opacity: 1,
},
underline: {
viewBox: "0 0 100 12",
d: "M 2 7 C 20 4.5, 46 8.5, 66 6 C 80 4.5, 92 7.5, 98 5.5",
strokeWidth: 4.5,
opacity: 1,
},
scribble: {
viewBox: "0 0 100 40",
d: "M 6 13 C 34 9.5, 66 11, 94 9 C 60 15, 26 16, 7 20 C 36 18, 68 21, 93 18 C 62 25, 28 27, 8 29",
strokeWidth: 5,
opacity: 0.65,
},
};
var styleName = Object.prototype.hasOwnProperty.call(markerStyles, vars.style)
? vars.style
: "highlight";
var marker = markerStyles[styleName];
// Split text around the first case-insensitive emphasis match.
// textContent nodes only, never innerHTML.
var matchIndex =
emphasis.length > 0 ? text.toLowerCase().indexOf(emphasis.toLowerCase()) : -1;
var emEl = null;
var pathEl = null;
if (matchIndex >= 0) {
var before = text.slice(0, matchIndex);
var matched = text.slice(matchIndex, matchIndex + emphasis.length);
var after = text.slice(matchIndex + emphasis.length);
if (before) textEl.appendChild(document.createTextNode(before));
emEl = document.createElement("span");
emEl.className = "mh-em";
emEl.setAttribute("data-marker-style", styleName);
var svgNS = "http://www.w3.org/2000/svg";
var svg = document.createElementNS(svgNS, "svg");
svg.setAttribute("class", "mh-mark");
svg.setAttribute("viewBox", marker.viewBox);
svg.setAttribute("preserveAspectRatio", "none");
svg.setAttribute("aria-hidden", "true");
pathEl = document.createElementNS(svgNS, "path");
pathEl.setAttribute("d", marker.d);
pathEl.setAttribute("fill", "none");
pathEl.setAttribute("stroke-width", String(marker.strokeWidth));
pathEl.setAttribute("stroke-linecap", "round");
pathEl.setAttribute("stroke-linejoin", "round");
// style.stroke, not the presentation attribute: var() only
// resolves as a CSS value.
pathEl.style.stroke = accentColors[accent];
svg.appendChild(pathEl);
var emText = document.createElement("span");
emText.className = "mh-em-text";
emText.textContent = matched;
emEl.appendChild(svg);
emEl.appendChild(emText);
textEl.appendChild(emEl);
if (after) textEl.appendChild(document.createTextNode(after));
} else {
textEl.textContent = text;
}
textEl.setAttribute("aria-label", text);
// Deterministic character-count fit; the line may wrap, the
// emphasized phrase never wraps internally.
var characters = Math.max(1, Array.from(text).length);
var fitted = Math.max(4.2, Math.min(9.5, 185 / characters));
root.style.setProperty("--mh-font-size", "min(" + fitted.toFixed(3) + "cqw, 16cqh)");
// RETIME RANGE: fixed phases; HOLD is the only elastic span.
var IN_BASE = 0.55;
var DRAW_BASE = 0.6;
var POP_BASE = 0.32;
var OUT_BASE = exit === "none" ? 0 : 0.45;
var duration = Math.max(0.001, parseFloat(root.dataset.duration || "3.5"));
var totalBase = IN_BASE + DRAW_BASE + OUT_BASE;
var scale = duration < totalBase ? duration / totalBase : 1;
var IN = IN_BASE * scale;
var DRAW = DRAW_BASE * scale;
var POP = POP_BASE * scale;
var OUT = OUT_BASE * scale;
var OUT_START = duration - OUT;
var drawAtRaw = Number(vars.draw_at);
var drawAt = Number.isFinite(drawAtRaw) ? Math.max(0, drawAtRaw) : 0.9;
// The stroke and its settle pop always land before the exit.
drawAt = Math.min(drawAt, Math.max(0, OUT_START - (DRAW + POP)));
gsap.set(stage, { opacity: 0, y: "6cqh" });
var tl = gsap.timeline({ paused: true });
// IN: the line rises into place.
tl.fromTo(
stage,
{ opacity: 0, y: "6cqh" },
{ opacity: 1, y: "0cqh", duration: IN, ease: "power3.out" },
0,
);
// DRAW: dash reveal from measured length; both endpoints explicit
// so any seek is correct without playing through.
if (pathEl) {
var length = pathEl.getTotalLength();
pathEl.style.strokeDasharray = String(length);
// Hidden until the cue: at dashoffset == length the round cap
// still paints a dot at the path start, so the ink is opacity 0
// until the exact frame the draw begins.
gsap.set(pathEl, { strokeDashoffset: length, opacity: 0 });
tl.set(pathEl, { opacity: marker.opacity }, drawAt);
tl.fromTo(
pathEl,
{ strokeDashoffset: length },
{ strokeDashoffset: 0, duration: DRAW, ease: "power2.inOut" },
drawAt,
);
// Settle pop on the emphasized word as the ink lands.
tl.fromTo(
emEl,
{ scale: 1 },
{
scale: 1.045,
duration: POP / 2,
ease: "power1.out",
yoyo: true,
repeat: 1,
},
drawAt + DRAW * 0.7,
);
}
// HOLD: completely still.
// OUT: optional departure; exit none holds until the frame cuts.
if (exit === "fade") {
tl.to(stage, { opacity: 0, duration: OUT, ease: "power2.in" }, OUT_START);
} else if (exit === "up") {
tl.to(stage, { opacity: 0, y: "-7cqh", duration: OUT, ease: "power2.in" }, OUT_START);
}
tl.seek(0);
window.__timelines = window.__timelines || {};
window.__timelines[compositionId] = tl;
})();
</script>
</div>
</template>
</body>
</html>
Usage
Opencompositions/components/marker-highlight.html and paste its contents into your composition. See the comment header in the file for detailed instructions.
Tagged motion-primitive typography emphasis marker deterministic.