Extruded Progress Slab: Hairline Animation

Extruded Progress Slab

A progress bar as an isometric slab that extrudes along its ruled base in three springy steps to full, accent on top, then clears. Hairline SVG through a clip path, CSS translate.

Also known as: isometric progress bar, 3d progress bar css, hairline loader.

Color Base size 16px Dark background

HTML

<div class="hln-progress-slab" role="status" aria-label="Loading, progress bar filling">
  <svg viewBox="-110 -60 220 120" aria-hidden="true"><g transform="translate(0 4) scale(1.6)"><defs><clipPath id="hln-progress-slab-clip"><polygon points="-41,80 -41,-18.5 -41,-22.5 -33,-26.5 -33,-80 200,-80 200,80"/></clipPath></defs><g><polygon points="-50,-17 30,23 30,21 -50,-19"/><polygon points="46,15 30,23 30,21 46,13"/><polygon points="-34,-27 46,13 30,21 -50,-19"/></g><line class="hln-progress-slab-in" x1="-43" y1="-17.5" x2="-45" y2="-16.5"/><line class="hln-progress-slab-in" x1="-34" y1="-13" x2="-36" y2="-12"/><line class="hln-progress-slab-in" x1="-25" y1="-8.5" x2="-27" y2="-7.5"/><line class="hln-progress-slab-in" x1="-16" y1="-4" x2="-18" y2="-3"/><line class="hln-progress-slab-in" x1="-7" y1="0.5" x2="-9" y2="1.5"/><line class="hln-progress-slab-in" x1="2" y1="5" x2="0" y2="6"/><line class="hln-progress-slab-in" x1="11" y1="9.5" x2="9" y2="10.5"/><line class="hln-progress-slab-in" x1="20" y1="14" x2="18" y2="15"/><line class="hln-progress-slab-in" x1="29" y1="18.5" x2="27" y2="19.5"/><g><polygon points="-47,-19.5 -43,-17.5 -43,-24.5 -47,-26.5"/><polygon points="-31,-23.5 -43,-17.5 -43,-24.5 -31,-30.5"/><polygon points="-35,-32.5 -31,-30.5 -43,-24.5 -47,-26.5"/></g><g clip-path="url(#hln-progress-slab-clip)"><g class="hln-progress-slab-fill"><g><polygon points="-113,-54.5 -41,-18.5 -41,-22.5 -113,-58.5"/><polygon points="-33,-22.5 -41,-18.5 -41,-22.5 -33,-26.5"/><polygon points="-105,-62.5 -33,-26.5 -41,-22.5 -113,-58.5"/></g></g></g><polyline fill="none" points="-41,-18.5 -41,-22.5 -33,-26.5"/></g></svg>
</div>

CSS

.hln-progress-slab {
  --c: var(--hln-color, #ff4f2e);
  font-size: var(--hln-size, 16px);
  position: relative;
  display: grid;
  place-items: center;
  width: 22em;
  height: 12em;
  border-radius: 0.75em;
  background: #f6f5f1;
  overflow: hidden;
  --u: 1px;
}
.hln-progress-slab svg {
  width: 100%;
  height: 100%;
  overflow: visible;
  fill: #ffffff;
  stroke: #1c1d21;
  stroke-width: 1.25;
  stroke-linejoin: round;
  stroke-linecap: round;
}
.hln-progress-slab svg * {
  vector-effect: non-scaling-stroke;
}
.hln-progress-slab .hln-progress-slab-in {
  stroke: #9a9ca3;
}
.hln-progress-slab .hln-progress-slab-fill {
  animation: hln-progress-slab-fill 5.2s infinite;
}
.hln-progress-slab .hln-progress-slab-fill polygon:last-child {
  fill: var(--c);
}
@keyframes hln-progress-slab-fill {
  0% { translate: 0 0; opacity: 1; }
  6% { translate: 0 0; animation-timing-function: cubic-bezier(0.3, 0, 0.2, 1); }
  13.7% { translate: calc(24.88 * var(--u)) calc(12.44 * var(--u)); animation-timing-function: ease-in-out; }
  17.2% { translate: calc(22.58 * var(--u)) calc(11.29 * var(--u)); animation-timing-function: ease-in-out; }
  20% { translate: calc(23.04 * var(--u)) calc(11.52 * var(--u)); }
  28% { translate: calc(23.04 * var(--u)) calc(11.52 * var(--u)); animation-timing-function: cubic-bezier(0.3, 0, 0.2, 1); }
  35.7% { translate: calc(51.03 * var(--u)) calc(25.52 * var(--u)); animation-timing-function: ease-in-out; }
  39.2% { translate: calc(48.44 * var(--u)) calc(24.22 * var(--u)); animation-timing-function: ease-in-out; }
  42% { translate: calc(48.96 * var(--u)) calc(24.48 * var(--u)); }
  50% { translate: calc(48.96 * var(--u)) calc(24.48 * var(--u)); animation-timing-function: cubic-bezier(0.3, 0, 0.2, 1); }
  57.7% { translate: calc(73.84 * var(--u)) calc(36.92 * var(--u)); animation-timing-function: ease-in-out; }
  61.2% { translate: calc(71.54 * var(--u)) calc(35.77 * var(--u)); animation-timing-function: ease-in-out; }
  64% { translate: calc(72 * var(--u)) calc(36 * var(--u)); }
  84% { translate: calc(72 * var(--u)) calc(36 * var(--u)); opacity: 1; animation-timing-function: ease-in; }
  94%, 100% { translate: calc(72 * var(--u)) calc(36 * var(--u)); opacity: 0; }
}
@media (prefers-reduced-motion: reduce) {
  .hln-progress-slab * {
    animation: none !important;
  }
  .hln-progress-slab .hln-progress-slab-fill { translate: calc(48.96 * var(--u)) calc(24.48 * var(--u)); }
}

@media (prefers-reduced-motion: reduce) {
  .hln-progress-slab, .hln-progress-slab *, .hln-progress-slab::before, .hln-progress-slab::after, .hln-progress-slab *::before, .hln-progress-slab *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

Customizing this snippet

Color: set --hln-color on the element or a parent. Currently previewing #3b82f6.
Base size: set --hln-size. Every other dimension is in em, so the whole thing scales together. Currently previewing 16px.
Speed: change the duration on the transition or animation shorthand. Staggered delays are relative, so they keep their rhythm.
Reduced motion: the rule at the end of the CSS turns the motion off for people who asked their OS for less of it. Keep it.

Extruded Progress Slab

HTML

CSS

Customizing this snippet

Similar hairline animations