Runs/circle · chain · relay/013
circle · chain · relay · step 013 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">
<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;
}
button:focus-visible {
outline: 3px solid var(--fg);
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 var(--fg));
}
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);
}
}
.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>
<button type="button" 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">Click to change color (or press <kbd>Space</kbd> or <kbd>Enter</kbd>)</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 {}
}
let index = Math.max(colors.indexOf(loadColor()), 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() {
index = (index + 1) % colors.length;
applyColor();
saveColor(colors[index]);
button.classList.remove('color-changed');
void button.offsetWidth;
button.classList.add('color-changed');
}
applyColor();
button.addEventListener('click', changeColor);
button.addEventListener('animationend', () => {
button.classList.remove('color-changed');
});
</script>
</body>
</html>
what changed from step 012
+38 / -26 lines
--fg: #2563eb; --shadow: rgba(0, 0, 0, 0.1);+ --kbd-bg: rgba(0, 0, 0, 0.1); } [data-color="red"] { --fg: #dc2626; }⋯ line 34 --fg: #93c5fd; --shadow: rgba(0, 0, 0, 0.6);+ --kbd-bg: rgba(255, 255, 255, 0.15); } [data-color="red"] { --fg: #fca5a5; }⋯ line 46 --shadow: rgba(0, 0, 0, 0.9); }+ .hint {+ opacity: 1;+ } } @media (forced-colors: active) {⋯ line 57 } body {+ min-height: 100vh; min-height: 100dvh; display: grid;⋯ line 75 button { display: block;- width: min(360px, 100%);+ width: min(360px, 100%, 60vh); aspect-ratio: 1; border: 0;⋯ line 97 opacity: 0.9; filter: drop-shadow(0 8px 16px var(--shadow));- transition: opacity 0.3s ease, color 0.4s ease;+ transition: opacity 0.3s ease; }- svg circle {- transition: r 0.3s ease;- } button:active svg, button:focus-visible svg { opacity: 1; }- button.color-changed svg {- animation: pulse 0.5s ease-out;- } @keyframes pulse { 0% {⋯ line 128 transform: scale(0.97); }+ button.color-changed svg {+ animation: pulse 0.5s ease-out;+ } } @media (hover: hover) and (prefers-reduced-motion: no-preference) {⋯ line 149 display: inline-block; padding: 0.125rem 0.375rem;- background: var(--shadow);+ background: var(--kbd-bg);+ border: 1px solid transparent; border-radius: 0.25rem; font-family: monospace;⋯ line 165 </button> <p class="status" id="status" role="status">Blue</p>- <p class="hint" id="hint">Click to change color (or press <kbd>Space</kbd>)</p>+ <p class="hint" id="hint">Click to change color (or press <kbd>Space</kbd> or <kbd>Enter</kbd>)</p> </main> <script>⋯ line 173 const storageKey = 'circle-color'; - const savedColor = localStorage.getItem(storageKey);- let index = Math.max(colors.indexOf(savedColor), 0);+ function loadColor() {+ try {+ return localStorage.getItem(storageKey);+ } catch {+ return null;+ }+ } + function saveColor(color) {+ try {+ localStorage.setItem(storageKey, color);+ } catch {}+ }+ + let index = Math.max(colors.indexOf(loadColor()), 0);+ function applyColor() { const color = colors[index];⋯ line 197 } status.textContent = color[0].toUpperCase() + color.slice(1);- localStorage.setItem(storageKey, color);- - button.classList.add('color-changed');- button.addEventListener('animationend', () => {- button.classList.remove('color-changed');- }, { once: true }); } - applyColor();- function changeColor() { index = (index + 1) % colors.length; applyColor();+ saveColor(colors[index]);+ + button.classList.remove('color-changed');+ void button.offsetWidth;+ button.classList.add('color-changed'); } - button.addEventListener('click', changeColor);+ applyColor(); - document.addEventListener('keydown', (e) => {- if ((e.code === 'Space' || e.code === 'Enter') && document.activeElement === button) {- e.preventDefault();- changeColor();- }+ button.addEventListener('click', changeColor);+ button.addEventListener('animationend', () => {+ button.classList.remove('color-changed'); }); </script>
What the model said
I made a set of bug fixes and accessibility tweaks to `0.html`, keeping the look and behaviour the same. Nothing was tested in a browser — shell commands other than the first directory listing were blocked in this session, so I only edited the file.
## Bugs fixed
- **Keyboard handling:** I removed the custom `keydown` handler. A `<button>` already fires `click` on Space and Enter, and the extra handler risked double-firing in some browsers and cycled colours rapidly when a key was held.
- **Storage errors:** `localStorage` reads and writes are now wrapped in `try/catch`, so the page still works when storage is blocked instead of the script dying on load.
- **Pulse on load:** the glow animation no longer plays on page load, only on an actual colour change. The colour is also no longer re-saved on load.
- **Pulse on rapid clicks:** the animation now restarts on each click. Before, clicking mid-animation did nothing, and each call added another `animationend` listener; there is now a single one.
- **Unreadable `<kbd>` in high contrast:** the key hint reused the shadow colour as its background, which became near-black behind dark text under `prefers-contrast: more`. It now has its own `--kbd-bg` variable, with a dark-mode value.
## Accessibility and layout
- **Reduced motion:** the pulse animation now only runs when the user has no reduced-motion preference.
- **High contrast and forced colours:** the hint text is fully opaque under `prefers-contrast: more`, and `<kbd>` has a transparent border that shows up in forced-colours mode.
- **Short viewports:** the circle is capped at `60vh`, so it should no longer push the text off-screen in landscape on a phone.
- **Older browsers:** added a `100vh` fallback ahead of `100dvh`.
- **Hint text:** it now mentions Enter as well as Space.
## Cleanup
- Removed the `svg circle { transition: r }` rule, which did nothing because the radius never changes.
- Removed the `color` transition on the `svg`, which was redundant with the one on the button.