Magnet Loader
A horseshoe magnet pulls a stream of dots onto its poles, each one speeding up as it gets closer and vanishing on contact, while dashed field lines pulse between the poles.
Also known as: magnet animation, magnetic attraction loader, horseshoe magnet loader.
HTML
<div class="ldr-magnet" role="status" aria-label="Loading"> <span class="ldr-magnet-field"></span> <span class="ldr-magnet-horseshoe"></span> <span class="ldr-magnet-dot" style="--i: 0; --lane: 0; --dy: -0.12"></span> <span class="ldr-magnet-dot" style="--i: 1; --lane: 1; --dy: 0.1"></span> <span class="ldr-magnet-dot" style="--i: 2; --lane: 0; --dy: 0.08"></span> <span class="ldr-magnet-dot" style="--i: 3; --lane: 1; --dy: -0.06"></span> <span class="ldr-magnet-dot" style="--i: 4; --lane: 0; --dy: -0.02"></span> <span class="ldr-magnet-dot" style="--i: 5; --lane: 1; --dy: 0.13"></span> </div>
CSS
.ldr-magnet {
--s: var(--ldr-size, 48px);
--c: var(--ldr-color, #3b82f6);
position: relative;
width: calc(var(--s) * 1.6);
height: var(--s);
}
.ldr-magnet-field,
.ldr-magnet-field::after {
position: absolute;
top: calc(var(--s) * 0.235);
left: calc(var(--s) * 0.5);
width: calc(var(--s) * 0.34);
height: calc(var(--s) * 0.53);
box-sizing: border-box;
border: 1px dashed color-mix(in srgb, var(--ldr-color, #3b82f6) 55%, transparent);
border-left: 0;
border-radius: 0 50% 50% 0 / 0 50% 50% 0;
animation: ldr-magnet-field 1.8s ease-in-out infinite;
}
.ldr-magnet-field::after {
content: "";
top: -1px;
left: 0;
width: calc(var(--s) * 0.7);
height: calc(100% + 2px);
animation-delay: -0.9s;
}
.ldr-magnet-horseshoe {
position: absolute;
top: calc(var(--s) * 0.15);
left: 0;
width: calc(var(--s) * 0.56);
height: calc(var(--s) * 0.7);
box-sizing: border-box;
border: calc(var(--s) * 0.17) solid var(--c);
border-right: 0;
border-radius: calc(var(--s) * 0.35) 0 0 calc(var(--s) * 0.35);
}
.ldr-magnet-horseshoe::before,
.ldr-magnet-horseshoe::after {
content: "";
position: absolute;
top: calc(var(--s) * -0.17);
right: 0;
width: calc(var(--s) * 0.13);
height: calc(var(--s) * 0.17);
background: color-mix(in srgb, var(--c) 40%, #fff);
}
.ldr-magnet-horseshoe::after {
top: auto;
bottom: calc(var(--s) * -0.17);
}
.ldr-magnet-dot {
position: absolute;
top: calc(var(--s) * (0.235 + var(--lane) * 0.53));
left: calc(var(--s) * 1.45);
width: calc(var(--s) / 9);
height: calc(var(--s) / 9);
margin: calc(var(--s) / -18);
border-radius: 50%;
background: var(--c);
opacity: 0;
animation: ldr-magnet-pull 1.8s infinite;
animation-delay: calc(var(--i) * -0.3s);
}
@keyframes ldr-magnet-pull {
0% { transform: translate(0, calc(var(--s) * var(--dy))) scale(0.6); opacity: 0; animation-timing-function: cubic-bezier(0.55, 0, 1, 0.45); }
20% { opacity: 1; }
80% { transform: translate(calc(var(--s) * -0.83), 0) scale(1); opacity: 1; }
100% { transform: translate(calc(var(--s) * -0.83), 0) scale(1); opacity: 0; }
}
@keyframes ldr-magnet-field {
0%, 100% { opacity: 0.35; }
50% { opacity: 1; }
}
@media (prefers-reduced-motion: reduce) {
.ldr-magnet, .ldr-magnet *, .ldr-magnet::before, .ldr-magnet::after, .ldr-magnet *::before, .ldr-magnet *::after {
animation-duration: 3s;
}
}Customizing this loader
- Color: set
--ldr-coloron the element or a parent. Currently previewing#3b82f6. - Size: set
--ldr-size. Every dimension in the snippet is derived from it. Currently previewing64px. - Speed: change the duration on the
animationshorthand. Delays on the children are relative, so they keep their rhythm. - Accessibility: the root carries
role="status"and anaria-labelso screen readers announce the wait. The reduced-motion rule at the end slows the animation for users who asked for less motion.