Three Triangles Loader
Three triangles form one larger triangle, and each spins a third of a turn in place, ducking small mid-spin so it clears its neighbors. The turn is invisible at rest, so only the motion shows.
Also known as: triangle loader, spinning triangles, sierpinski triangle loader.
HTML
<div class="ldr-triangle-trio" role="status" aria-label="Loading"> <span></span><span></span><span></span> </div>
CSS
.ldr-triangle-trio {
--s: var(--ldr-size, 48px);
--c: var(--ldr-color, #3b82f6);
--a: calc(var(--s) * 0.52);
--h: calc(var(--a) * 0.866);
--g: calc(var(--s) * 0.05);
position: relative;
width: calc(var(--a) * 2 + var(--g));
height: calc(var(--h) * 2 + var(--g));
}
.ldr-triangle-trio span {
position: absolute;
bottom: 0;
width: var(--a);
height: var(--h);
background: var(--c);
clip-path: polygon(50% 0, 100% 100%, 0 100%);
transform-origin: 50% 66.67%;
animation: ldr-triangle-trio-spin 1.8s infinite;
}
.ldr-triangle-trio span:nth-child(1) {
top: 0;
bottom: auto;
left: calc(var(--a) / 2 + var(--g) / 2);
}
.ldr-triangle-trio span:nth-child(2) {
right: 0;
background: color-mix(in srgb, var(--c) 72%, #000);
animation-delay: 0.2s;
}
.ldr-triangle-trio span:nth-child(3) {
left: 0;
background: color-mix(in srgb, var(--c) 60%, #fff);
animation-delay: 0.4s;
}
@keyframes ldr-triangle-trio-spin {
0% { transform: rotate(0deg) scale(1); animation-timing-function: cubic-bezier(0.5, 0, 0.75, 0); }
16% { transform: rotate(60deg) scale(0.5); animation-timing-function: cubic-bezier(0.25, 1, 0.5, 1); }
34%, 100% { transform: rotate(120deg) scale(1); }
}
@media (prefers-reduced-motion: reduce) {
.ldr-triangle-trio, .ldr-triangle-trio *, .ldr-triangle-trio::before, .ldr-triangle-trio::after, .ldr-triangle-trio *::before, .ldr-triangle-trio *::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.