Runs/circle · chain · Sonnet 5/010
circle · chain · Sonnet 5 · step 010 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">
<title>Pulsing Circle</title>
<style>
:root {
--circle-hue: #8ec5ff;
--circle-core: #4a7dd9;
--circle-shadow: #1f3a75;
--cycle: 2.5s;
}
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
body {
width: 100vw;
height: 100vh;
display: flex;
flex-direction: column;
justify-content: center;
align-items: center;
gap: 24px;
background: radial-gradient(circle at center, #1a1a2e 0%, #0d0d17 100%);
overflow: hidden;
}
svg {
width: min(400px, 80vmin);
height: min(400px, 80vmin);
overflow: visible;
cursor: pointer;
transition: filter 0.3s ease;
}
svg:hover {
filter: brightness(1.08);
}
svg:focus-visible {
outline: 2px solid var(--circle-hue);
outline-offset: 8px;
border-radius: 50%;
}
.ambient {
fill: var(--circle-hue);
opacity: 0.12;
filter: blur(30px);
animation: breathe var(--cycle) cubic-bezier(0.4, 0, 0.2, 1) infinite;
transform-origin: 200px 200px;
will-change: transform, opacity;
}
.core {
animation: pulse var(--cycle) cubic-bezier(0.4, 0, 0.2, 1) infinite;
transform-origin: 200px 200px;
filter: url(#glow);
will-change: transform, opacity;
}
.highlight {
fill: url(#highlightGradient);
transform-origin: 200px 200px;
animation: pulse var(--cycle) cubic-bezier(0.4, 0, 0.2, 1) infinite;
pointer-events: none;
will-change: transform, opacity;
}
.ring {
fill: none;
stroke: var(--circle-hue);
stroke-width: 2.5;
transform-origin: 200px 200px;
animation: ripple var(--cycle) cubic-bezier(0.2, 0.6, 0.4, 1) infinite;
will-change: transform, opacity, stroke-width;
}
.ring--delay-1 {
animation-delay: calc(var(--cycle) / 3);
}
.ring--delay-2 {
animation-delay: calc(var(--cycle) / 3 * 2);
}
@keyframes pulse {
0%, 100% {
transform: scale(1);
opacity: 0.9;
}
50% {
transform: scale(1.05);
opacity: 1;
}
}
@keyframes breathe {
0%, 100% {
transform: scale(0.95);
opacity: 0.1;
}
50% {
transform: scale(1.1);
opacity: 0.18;
}
}
@keyframes ripple {
0% {
transform: scale(1);
opacity: 0.6;
stroke-width: 2.5;
}
100% {
transform: scale(1.35);
opacity: 0;
stroke-width: 0.5;
}
}
@media (prefers-reduced-motion: reduce) {
.core, .ring, .ambient, .highlight {
animation: none;
}
.ring {
opacity: 0.35;
}
.ambient {
opacity: 0.12;
}
}
body.paused .core,
body.paused .ring,
body.paused .ambient,
body.paused .highlight {
animation-play-state: paused;
}
.speed-label {
color: var(--circle-hue);
font-family: system-ui, sans-serif;
font-size: 0.85rem;
letter-spacing: 0.05em;
opacity: 0.7;
user-select: none;
text-align: center;
}
.hint {
display: block;
margin-top: 4px;
font-size: 0.7rem;
opacity: 0.6;
}
</style>
</head>
<body>
<svg id="ae683f770" viewBox="0 0 400 400" role="button" tabindex="0" aria-label="Pulsing blue circle animation, normal speed. Click or press Enter to change pulse speed. Press space to pause.">
<defs>
<radialGradient id="circleGradient" cx="35%" cy="35%" r="65%">
<stop offset="0%" stop-color="#8ec5ff"/>
<stop offset="55%" stop-color="#4a7dd9"/>
<stop offset="100%" stop-color="#1f3a75"/>
</radialGradient>
<radialGradient id="highlightGradient" cx="32%" cy="28%" r="22%">
<stop offset="0%" stop-color="#ffffff" stop-opacity="0.55"/>
<stop offset="100%" stop-color="#ffffff" stop-opacity="0"/>
</radialGradient>
<filter id="glow" x="-80%" y="-80%" width="260%" height="260%">
<feGaussianBlur in="SourceGraphic" stdDeviation="10" result="blur"/>
<feColorMatrix in="blur" type="matrix"
values="0 0 0 0 0.55 0 0 0 0 0.77 0 0 0 0 1 0 0 0 0.9 0" result="tintedBlur"/>
<feMerge>
<feMergeNode in="tintedBlur"/>
<feMergeNode in="SourceGraphic"/>
</feMerge>
</filter>
</defs>
<circle class="ambient" cx="200" cy="200" r="160"/>
<circle class="ring" cx="200" cy="200" r="140"/>
<circle class="ring ring--delay-1" cx="200" cy="200" r="140"/>
<circle class="ring ring--delay-2" cx="200" cy="200" r="140"/>
<circle class="core" cx="200" cy="200" r="140" fill="url(#circleGradient)"/>
<circle class="highlight" cx="200" cy="200" r="140"/>
</svg>
<p class="speed-label" id="speedLabel" aria-live="polite">
Normal speed
<span class="hint">Click to change speed · Space to pause</span>
</p>
<script>
const svg = document.getElementById('ae683f770');
const speedLabel = document.getElementById('speedLabel');
const speeds = [
{ value: '2.5s', name: 'Normal speed' },
{ value: '1.2s', name: 'Fast speed' },
{ value: '4.5s', name: 'Slow speed' },
];
let speedIndex = 0;
let manuallyPaused = false;
function updateAriaLabel() {
const { name } = speeds[speedIndex];
const state = manuallyPaused ? 'paused' : name.toLowerCase();
svg.setAttribute('aria-label', `Pulsing blue circle animation, ${state}. Click or press Enter to change pulse speed. Press space to pause.`);
}
function cycleSpeed() {
speedIndex = (speedIndex + 1) % speeds.length;
const { value, name } = speeds[speedIndex];
svg.style.setProperty('--cycle', value);
speedLabel.firstChild.textContent = name + ' ';
updateAriaLabel();
}
function togglePause() {
manuallyPaused = !manuallyPaused;
document.body.classList.toggle('paused', manuallyPaused);
updateAriaLabel();
}
svg.addEventListener('click', cycleSpeed);
svg.addEventListener('keydown', (e) => {
if (e.key === 'Enter') {
e.preventDefault();
cycleSpeed();
} else if (e.key === ' ') {
e.preventDefault();
togglePause();
}
});
document.addEventListener('visibilitychange', () => {
document.body.classList.toggle('paused', document.hidden || manuallyPaused);
});
</script>
</body>
</html>
what changed from step 009
+34 / -10 lines
height: 100vh; display: flex;+ flex-direction: column; justify-content: center; align-items: center;+ gap: 24px; background: radial-gradient(circle at center, #1a1a2e 0%, #0d0d17 100%); overflow: hidden;⋯ line 128 } .speed-label {- position: absolute;- bottom: 24px;- left: 50%;- transform: translateX(-50%); color: var(--circle-hue); font-family: system-ui, sans-serif;⋯ line 134 opacity: 0.7; user-select: none;+ text-align: center; }+ .hint {+ display: block;+ margin-top: 4px;+ font-size: 0.7rem;+ opacity: 0.6;+ } </style> </head> <body>- <svg id="ae683f770" viewBox="0 0 400 400" role="img" tabindex="0" aria-label="Pulsing blue circle animation. Click or press Enter to change pulse speed.">+ <svg id="ae683f770" viewBox="0 0 400 400" role="button" tabindex="0" aria-label="Pulsing blue circle animation, normal speed. Click or press Enter to change pulse speed. Press space to pause."> <defs> <radialGradient id="circleGradient" cx="35%" cy="35%" r="65%">⋯ line 173 <circle class="highlight" cx="200" cy="200" r="140"/> </svg>- <p class="speed-label" id="speedLabel" aria-live="polite">Normal speed</p>+ <p class="speed-label" id="speedLabel" aria-live="polite">+ Normal speed+ <span class="hint">Click to change speed · Space to pause</span>+ </p> <script> const svg = document.getElementById('ae683f770');⋯ line 186 ]; let speedIndex = 0;+ let manuallyPaused = false; + function updateAriaLabel() {+ const { name } = speeds[speedIndex];+ const state = manuallyPaused ? 'paused' : name.toLowerCase();+ svg.setAttribute('aria-label', `Pulsing blue circle animation, ${state}. Click or press Enter to change pulse speed. Press space to pause.`);+ }+ function cycleSpeed() { speedIndex = (speedIndex + 1) % speeds.length; const { value, name } = speeds[speedIndex]; svg.style.setProperty('--cycle', value);- speedLabel.textContent = name;- svg.setAttribute('aria-label', `Pulsing blue circle animation, ${name.toLowerCase()}. Click or press Enter to change pulse speed.`);+ speedLabel.firstChild.textContent = name + ' ';+ updateAriaLabel(); } + function togglePause() {+ manuallyPaused = !manuallyPaused;+ document.body.classList.toggle('paused', manuallyPaused);+ updateAriaLabel();+ }+ svg.addEventListener('click', cycleSpeed); svg.addEventListener('keydown', (e) => {- if (e.key === 'Enter' || e.key === ' ') {+ if (e.key === 'Enter') { e.preventDefault(); cycleSpeed();+ } else if (e.key === ' ') {+ e.preventDefault();+ togglePause(); } }); document.addEventListener('visibilitychange', () => {- document.body.classList.toggle('paused', document.hidden);+ document.body.classList.toggle('paused', document.hidden || manuallyPaused); }); </script>
What the model said
I couldn't open the browser to visually verify (blocked, no approval surface available), so please open `0.html` yourself to confirm it looks right.
Summary of improvements made:
- Fixed `role="img"` → `role="button"` since the SVG is an interactive control, not just decorative imagery.
- Added a manual pause/resume via spacebar (previously only auto-paused when the tab was hidden).
- Replaced fragile absolute positioning of the speed label with proper flex layout so it stays aligned with the circle at any viewport size.
- Added a visible hint text ("Click to change speed · Space to pause") and kept the aria-label in sync with both speed and pause state for screen reader users.