Runs/circle · chain · relay/017
circle · chain · relay · step 017 of 64
offline render, Chrome 154, light scheme, 2 s of virtual time
runs in a sandboxed frame with no origin; live pages may fetch CDN fonts the offline render did not
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta name="color-scheme" content="light dark">
<title>Animated Circle - Interactive Demo</title>
<meta name="description" content="A responsive, accessible circle that changes color when clicked">
<meta name="theme-color" content="#ffffff" media="(prefers-color-scheme: light)">
<meta name="theme-color" content="#111111" media="(prefers-color-scheme: dark)">
<link rel="icon" href="data:,">
<style>
*,
*::before,
*::after {
box-sizing: border-box;
margin: 0;
padding: 0;
}
:root {
color-scheme: light dark;
--bg: #fff;
--text: #374151;
--fg: #2563eb;
--shadow: rgba(0, 0, 0, 0.1);
--kbd-bg: rgba(0, 0, 0, 0.1);
}
[data-color="red"] { --fg: #dc2626; }
[data-color="green"] { --fg: #16a34a; }
[data-color="amber"] { --fg: #d97706; }
[data-color="violet"] { --fg: #7c3aed; }
[data-color="cyan"] { --fg: #0891b2; }
@media (prefers-color-scheme: dark) {
:root {
--bg: #111;
--text: #d1d5db;
--fg: #93c5fd;
--shadow: rgba(0, 0, 0, 0.6);
--kbd-bg: rgba(255, 255, 255, 0.15);
}
[data-color="red"] { --fg: #fca5a5; }
[data-color="green"] { --fg: #86efac; }
[data-color="amber"] { --fg: #fcd34d; }
[data-color="violet"] { --fg: #c4b5fd; }
[data-color="cyan"] { --fg: #67e8f9; }
}
@media (prefers-contrast: more) {
:root {
--shadow: rgba(0, 0, 0, 0.9);
}
.hint {
opacity: 1;
}
}
@media (forced-colors: active) {
svg circle {
stroke: CanvasText;
stroke-width: 2;
}
}
body {
min-height: 100vh;
min-height: 100dvh;
display: grid;
place-items: center;
padding: 1rem;
background: var(--bg);
color: var(--text);
font-family: system-ui, -apple-system, sans-serif;
}
main {
width: 100%;
display: flex;
flex-direction: column;
align-items: center;
text-align: center;
}
button {
display: block;
width: min(360px, 100%, 60vh);
aspect-ratio: 1;
border: 0;
border-radius: 50%;
background: none;
color: var(--fg);
cursor: pointer;
touch-action: manipulation;
-webkit-tap-highlight-color: transparent;
transition: color 0.4s ease;
}
.no-transition,
.no-transition svg {
transition: none !important;
}
button:focus-visible {
outline: 3px solid currentColor;
outline-offset: 8px;
}
svg {
display: block;
width: 100%;
height: 100%;
overflow: visible;
opacity: 0.9;
filter: drop-shadow(0 8px 16px var(--shadow));
transition: opacity 0.3s ease;
}
button:active svg,
button:focus-visible svg {
opacity: 1;
}
@keyframes pulse {
0% {
filter: drop-shadow(0 8px 16px var(--shadow)) drop-shadow(0 0 20px currentColor);
}
100% {
filter: drop-shadow(0 8px 16px var(--shadow));
}
}
@media (hover: hover) {
button:hover svg {
opacity: 1;
}
}
@media (prefers-reduced-motion: no-preference) {
svg {
transition:
transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1),
opacity 0.3s ease;
}
button:focus-visible svg {
transform: scale(1.05);
}
button:active svg {
transform: scale(0.97);
}
button.color-changed svg {
animation: pulse 0.5s ease-out;
}
}
@media (hover: hover) and (prefers-reduced-motion: no-preference) {
button:hover:not(:active) svg {
transform: scale(1.05);
}
}
.visually-hidden {
position: absolute;
width: 1px;
height: 1px;
overflow: hidden;
clip-path: inset(50%);
white-space: nowrap;
}
.status {
margin-top: 2rem;
font-weight: 600;
}
.hint {
margin-top: 0.25rem;
font-size: 0.875rem;
opacity: 0.8;
}
kbd {
display: inline-block;
padding: 0.125rem 0.375rem;
background: var(--kbd-bg);
border: 1px solid transparent;
border-radius: 0.25rem;
font-family: monospace;
font-size: 0.75em;
}
</style>
</head>
<body>
<main>
<h1 class="visually-hidden">Animated Circle</h1>
<button type="button" class="no-transition" aria-label="Change circle color" aria-describedby="status hint">
<svg viewBox="0 0 100 100" aria-hidden="true" focusable="false" xmlns="http://www.w3.org/2000/svg">
<circle cx="50" cy="50" r="50" fill="currentColor"/>
</svg>
</button>
<p class="status" id="status" role="status">Blue</p>
<p class="hint" id="hint"><span class="verb">Click</span> to change color (or press <kbd>Space</kbd> or <kbd>Enter</kbd>; hold <kbd>Shift</kbd> to go back)</p>
</main>
<script>
const button = document.querySelector('button');
const status = document.querySelector('.status');
const colors = ['blue', 'red', 'green', 'amber', 'violet', 'cyan'];
const storageKey = 'circle-color';
function loadColor() {
try {
return localStorage.getItem(storageKey);
} catch {
return null;
}
}
function saveColor(color) {
try {
localStorage.setItem(storageKey, color);
} catch {}
}
const savedColor = loadColor();
let index = colors.includes(savedColor) ? colors.indexOf(savedColor) : 0;
function applyColor() {
const color = colors[index];
if (color === 'blue') {
delete button.dataset.color;
} else {
button.dataset.color = color;
}
status.textContent = color[0].toUpperCase() + color.slice(1);
}
function changeColor(event) {
const step = event.shiftKey ? -1 : 1;
index = (index + step + colors.length) % colors.length;
applyColor();
saveColor(colors[index]);
button.classList.remove('color-changed');
void button.offsetWidth;
button.classList.add('color-changed');
}
applyColor();
requestAnimationFrame(() => {
requestAnimationFrame(() => button.classList.remove('no-transition'));
});
if (matchMedia('(hover: none)').matches) {
document.querySelector('.hint .verb').textContent = 'Tap';
}
button.addEventListener('click', changeColor);
button.addEventListener('animationend', () => {
button.classList.remove('color-changed');
});
addEventListener('storage', (event) => {
if (event.key === storageKey && colors.includes(event.newValue)) {
index = colors.indexOf(event.newValue);
applyColor();
}
});
</script>
</body>
</html>
what changed from step 016
+17 / -8 lines
} button:focus-visible {- outline: 3px solid var(--fg);+ outline: 3px solid currentColor; outline-offset: 8px; }⋯ line 112 @keyframes pulse { 0% {- filter: drop-shadow(0 8px 16px var(--shadow)) drop-shadow(0 0 20px var(--fg));+ filter: drop-shadow(0 8px 16px var(--shadow)) drop-shadow(0 0 20px currentColor); } 100% {⋯ line 144 } }+ .visually-hidden {+ position: absolute;+ width: 1px;+ height: 1px;+ overflow: hidden;+ clip-path: inset(50%);+ white-space: nowrap;+ } .status { margin-top: 2rem;⋯ line 174 <body> <main>+ <h1 class="visually-hidden">Animated Circle</h1> <button type="button" class="no-transition" aria-label="Change circle color" aria-describedby="status hint"> <svg viewBox="0 0 100 100" aria-hidden="true" focusable="false" xmlns="http://www.w3.org/2000/svg">⋯ line 237 button.addEventListener('click', changeColor);- button.addEventListener('keydown', (event) => {- if (event.code === 'Space' || event.code === 'Enter') {- event.preventDefault();- changeColor(event);- }- }); button.addEventListener('animationend', () => { button.classList.remove('color-changed');+ });+ addEventListener('storage', (event) => {+ if (event.key === storageKey && colors.includes(event.newValue)) {+ index = colors.indexOf(event.newValue);+ applyColor();+ } }); </script>
What the model said
I made five small changes to `0.html`, but none of them has been tested in a browser. The command I used to look for a browser and test tooling was denied in this session. ## What changed - **Removed the `keydown` handler.** A `<button>` already fires `click` for Space and Enter, and that event carries `shiftKey`, so Shift-to-go-back should still work. The old handler missed numpad Enter, and could advance the color twice per Space press in browsers that still fire `click` on keyup. - **Added cross-tab sync.** A `storage` listener updates the circle when the color is changed in another tab. - **Focus ring now uses `currentColor`.** It previously used `var(--fg)`, so it snapped to the new color while the circle faded over 0.4s. - **Pulse glow now uses `currentColor`.** Same reason as the focus ring. - **Added a visually hidden `<h1>`.** The page had no heading for screen-reader navigation. ## Worth checking in a browser - Space, Enter and numpad Enter each advance the color exactly once, and Shift plus any of them goes back. - The glow and focus ring fade in step with the circle. - Changing the color in one tab updates a second open tab.