Прелоадер с анимацией сбоя загрузки на CSS
See the Pen Loading Goes Off Track by Jon Kantner (@jkantner) on CodePen.
HTML
<svg class="pl" viewBox="0 0 128 128" width="128px" height="128px" xmlns="http://www.w3.org/2000/svg">
<defs>
<linearGradient id="pl-grad" x1="0" y1="0" x2="0" y2="1">
<stop offset="0%" stop-color="hsl(193,90%,55%)" />
<stop offset="100%" stop-color="hsl(223,90%,55%)" />
</linearGradient>
</defs>
<circle class="pl__ring" r="56" cx="64" cy="64" fill="none" stroke="hsla(0,10%,10%,0.1)" stroke-width="16" stroke-linecap="round" />
<path class="pl__worm" d="M92,15.492S78.194,4.967,66.743,16.887c-17.231,17.938-28.26,96.974-28.26,96.974L119.85,59.892l-99-31.588,57.528,89.832L97.8,19.349,13.636,88.51l89.012,16.015S81.908,38.332,66.1,22.337C50.114,6.156,36,15.492,36,15.492a56,56,0,1,0,56,0Z" fill="none" stroke="url(#pl-grad)" stroke-width="16" stroke-linecap="round" stroke-linejoin="round" stroke-dasharray="44 1111" stroke-dashoffset="10" />
</svg>
CSS
* {border: 0;box-sizing: border-box;margin: 0;padding: 0;}:root {--hue: 223;--bg: hsl(var(--hue),10%,90%);--fg: hsl(var(--hue),10%,10%);font-size: calc(16px + (24 - 16) * (100vw - 320px) / (1280 - 320));}body {background-color: var(--bg);color: var(--fg);font: 1em/1.5 sans-serif;height: 100vh;display: grid;place-items: center;transition: background-color 0.3s;}main {padding: 1.5em 0;}.pl,.pl__worm {animation-duration: 3s;animation-iteration-count: infinite;}.pl {animation-name: bump;animation-timing-function: linear;width: 8em;height: 8em;}.pl__ring {stroke: hsla(var(--hue),10%,10%,0.1);transition: stroke 0.3s;}.pl__worm {animation-name: worm;animation-timing-function: cubic-bezier(0.42,0.17,0.75,0.83);}/* Dark theme */@media (prefers-color-scheme: dark) {:root {--bg: hsl(var(--hue),10%,10%);--fg: hsl(var(--hue),10%,90%);}.pl__ring {stroke: hsla(var(--hue),10%,90%,0.1);}}/* Animations */@keyframes bump {from,42%,46%,51%,55%,59%,63%,67%,71%,74%,78%,81%,85%,88%,92%,to { transform: translate(0,0); }44% { transform: translate(1.33%,6.75%); }53% { transform: translate(-16.67%,-0.54%); }61% { transform: translate(3.66%,-2.46%); }69% { transform: translate(-0.59%,15.27%); }76% { transform: translate(-1.92%,-4.68%); }83% { transform: translate(9.38%,0.96%); }90% { transform: translate(-4.55%,1.98%); }}@keyframes worm {from { stroke-dashoffset: 10; }25% { stroke-dashoffset: 295; }to { stroke-dashoffset: 1165; }}