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stanwmusic/css-scoped-custom-property-trail-grid.markdown

Created December 16, 2025 08:42
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CSS scoped custom property trail grid 👨‍🍳
Raw
css-scoped-custom-property-trail-grid.markdown
Raw
index.html
<main>
<h1 class="fluid">hey.</h1>
<div class="grid"></div>
</main>
<a
aria-label="Follow Jhey"
class="bear-link"
href="https://twitter.com/intent/follow?screen_name=jh3yy"
target="_blank"
rel="noreferrer noopener"
>
<svg
class="w-9"
viewBox="0 0 969 955"
fill="none"
xmlns="http://www.w3.org/2000/svg"
>
<circle
cx="161.191"
cy="320.191"
r="133.191"
stroke="currentColor"
stroke-width="20"
></circle>
<circle
cx="806.809"
cy="320.191"
r="133.191"
stroke="currentColor"
stroke-width="20"
></circle>
<circle
cx="695.019"
cy="587.733"
r="31.4016"
fill="currentColor"
></circle>
<circle
cx="272.981"
cy="587.733"
r="31.4016"
fill="currentColor"
></circle>
<path
d="M564.388 712.083C564.388 743.994 526.035 779.911 483.372 779.911C440.709 779.911 402.356 743.994 402.356 712.083C402.356 680.173 440.709 664.353 483.372 664.353C526.035 664.353 564.388 680.173 564.388 712.083Z"
fill="currentColor"
></path>
<rect
x="310.42"
y="448.31"
width="343.468"
height="51.4986"
fill="#FF1E1E"
></rect>
<path
fill-rule="evenodd"
clip-rule="evenodd"
d="M745.643 288.24C815.368 344.185 854.539 432.623 854.539 511.741H614.938V454.652C614.938 433.113 597.477 415.652 575.938 415.652H388.37C366.831 415.652 349.37 433.113 349.37 454.652V511.741L110.949 511.741C110.949 432.623 150.12 344.185 219.845 288.24C289.57 232.295 384.138 200.865 482.744 200.865C581.35 200.865 675.918 232.295 745.643 288.24Z"
fill="currentColor"
></path>
</svg>
</a>
Raw
script.babel
import gsap from 'https://cdn.skypack.dev/[email protected]'
import Draggable from 'https://cdn.skypack.dev/[email protected]/Draggable'
import { Pane } from 'https://cdn.skypack.dev/[email protected]'
gsap.registerPlugin(Draggable)
const config = {
theme: 'system',
cols: 20,
rows: 10,
}
const ctrl = new Pane({
title: 'config',
expanded: true,
})
const grid = document.querySelector('.grid')
const buildGrid = () => {
grid.innerHTML = new Array(config.cols * config.rows).fill(0).map((_, index) => `
<div style="
--grade: ${Math.floor(Math.random() * 12 - 6)};
--opacity: ${Math.min(Math.random(), 0.2)};
--hue: ${Math.floor(Math.random() * 30)};
">+</div>
`).join('')
grid.style.setProperty('--cols', config.cols)
grid.style.setProperty('--rows', config.rows)
}
buildGrid()
const update = () => {
document.documentElement.dataset.theme = config.theme
}
const sync = (event) => {
if (
!document.startViewTransition ||
event.target.controller.view.labelElement.innerText !== 'theme'
)
return update()
document.startViewTransition(() => update())
}
ctrl.addBinding(config, 'cols', {
min: 5,
max: 30,
step: 1,
}).on('change', buildGrid)
ctrl.addBinding(config, 'rows', {
min: 5,
max: 30,
step: 1,
}).on('change', buildGrid)
ctrl.addBinding(config, 'theme', {
label: 'theme',
options: {
system: 'system',
light: 'light',
dark: 'dark',
},
})
ctrl.on('change', sync)
update()
// make tweakpane panel draggable
const tweakClass = 'div.tp-dfwv'
const d = Draggable.create(tweakClass, {
type: 'x,y',
allowEventDefault: true,
trigger: tweakClass + ' button.tp-rotv_b',
})
document.querySelector(tweakClass).addEventListener('dblclick', () => {
gsap.to(tweakClass, {
x: `+=${d[0].x * -1}`,
y: `+=${d[0].y * -1}`,
onComplete: () => {
gsap.set(tweakClass, { clearProps: 'all' })
},
})
})
if (window.matchMedia('(hover: none) and (pointer: coarse)').matches) {
grid.addEventListener('pointermove', (event) => {
document.querySelector('[data-hover]')?.removeAttribute('data-hover')
document.elementFromPoint(event.x, event.y).dataset.hover = 'true'
}, true)
grid.addEventListener('pointerleave', (event) => {
document.querySelector('[data-hover]')?.removeAttribute('data-hover')
}, true)
}
Raw
style.css
@import url('https://unpkg.com/normalize.css') layer(normalize);
@layer normalize, base, demo, mobile;
@layer mobile {
.grid div[data-hover] {
transition-property: opacity, rotate, filter;
transition-duration: 0s;
rotate: calc(var(--grade, 0) * 90deg);
filter: grayscale(0) brightness(1.5);
opacity: 1;
}
}
@layer demo {
h1 {
--font-level: 5;
translate: 12px;
margin: 0;
margin-bottom: 1rem;
color: color-mix(in hsl, canvasText, canvas 25%);
}
.grid {
touch-action: none;
display: grid;
grid-template: repeat(var(--rows, 10), 1fr) / repeat(var(--cols, 10), 1fr);
font-size: 2rem;
font-weight: 600;
line-height: 1;
font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
cursor: none;
div {
touch-action: none;
padding: 2px;
opacity: calc(var(--opacity) * 0.5);
aspect-ratio: 1;
display: grid;
place-items: center;
transition-property: opacity, rotate, filter;
transition-duration: 0.8s, 0.4s, 0.6s;
transition-timing-function: ease-in, ease-out, ease-out;
scale: 1.5;
filter: grayscale(1);
color: hsl(var(--hue) 80% 50%);
@media(prefers-color-scheme: dark) {
opacity: calc(var(--opacity) + 0.2);
}
@media(hover: hover) and (pointer: fine) {
&:hover {
transition-property: opacity, rotate, filter;
transition-duration: 0s;
rotate: calc(var(--grade, 0) * 90deg);
filter: grayscale(0) brightness(1.5);
opacity: 1;
}
}
}
}
[data-theme='dark'] .grid div {
opacity: calc(var(--opacity) + 0.2);
@media(hover: hover) and (pointer: fine) {
&:hover {
opacity: 1;
}
}
}
}
@layer base {
:root {
--font-size-min: 16;
--font-size-max: 20;
--font-ratio-min: 1.2;
--font-ratio-max: 1.33;
--font-width-min: 375;
--font-width-max: 1500;
}
html {
color-scheme: light dark;
}
[data-theme='light'] {
color-scheme: light only;
}
[data-theme='dark'] {
color-scheme: dark only;
}
:where(.fluid) {
--fluid-min: calc(
var(--font-size-min) * pow(var(--font-ratio-min), var(--font-level, 0))
);
--fluid-max: calc(
var(--font-size-max) * pow(var(--font-ratio-max), var(--font-level, 0))
);
--fluid-preferred: calc(
(var(--fluid-max) - var(--fluid-min)) /
(var(--font-width-max) - var(--font-width-min))
);
--fluid-type: clamp(
(var(--fluid-min) / 16) * 1rem,
((var(--fluid-min) / 16) * 1rem) -
(((var(--fluid-preferred) * var(--font-width-min)) / 16) * 1rem) +
(var(--fluid-preferred) * var(--variable-unit, 100vi)),
(var(--fluid-max) / 16) * 1rem
);
font-size: var(--fluid-type);
}
*,
*:after,
*:before {
box-sizing: border-box;
}
body {
overflow-x: hidden;
background: light-dark(#fff, #000);
display: grid;
place-items: center;
min-height: 100vh;
font-family: 'SF Pro Text', 'SF Pro Icons', 'AOS Icons', 'Helvetica Neue',
Helvetica, Arial, sans-serif, system-ui;
}
body::before {
--size: 45px;
--line: color-mix(in hsl, canvasText, transparent 80%);
content: '';
height: 100vh;
width: 100vw;
position: fixed;
background: linear-gradient(
90deg,
var(--line) 1px,
transparent 1px var(--size)
)
calc(var(--size) * 0.36) 50% / var(--size) var(--size),
linear-gradient(var(--line) 1px, transparent 1px var(--size)) 0%
calc(var(--size) * 0.32) / var(--size) var(--size);
mask: linear-gradient(-20deg, transparent 50%, white);
top: 0;
transform-style: flat;
pointer-events: none;
z-index: -1;
}
.bear-link {
color: canvasText;
position: fixed;
top: 1rem;
left: 1rem;
width: 48px;
aspect-ratio: 1;
display: grid;
place-items: center;
opacity: 0.8;
}
:where(.x-link, .bear-link):is(:hover, :focus-visible) {
opacity: 1;
}
.bear-link svg {
width: 75%;
}
/* Utilities */
.sr-only {
position: absolute;
width: 1px;
height: 1px;
padding: 0;
margin: -1px;
overflow: hidden;
clip: rect(0, 0, 0, 0);
white-space: nowrap;
border-width: 0;
}
}
div.tp-dfwv {
width: 256px;
position: fixed;
}
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