@keyframes progress {
  0% { --percentage: 0; }
  100% { --percentage: var(--value); }
}

@property --percentage {
  syntax: '<number>';
  inherits: true;
  initial-value: 0;
}

[role="progressbar"] {
  --percentage: var(--value);
  --primary: #369;
  --secondary: #adf;
  --size: 300px;
  animation: progress 2s 0.5s forwards;
  width: var(--size);
  aspect-ratio: 2 / 1;
  border-radius: 50% / 100% 100% 0 0;
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: flex-end;
  justify-content: center;
}

[role="progressbar"]::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: conic-gradient(from 0.75turn at 50% 100%, var(--primary) calc(var(--percentage) * 1% / 2), var(--secondary) calc(var(--percentage) * 1% / 2 + 0.1%));
  mask: radial-gradient(at 50% 100%, white 55%, transparent 55.5%);
  mask-mode: alpha;
  -webkit-mask: radial-gradient(at 50% 100%, #0000 55%, #000 55.5%);
  -webkit-mask-mode: alpha;
}

[role="progressbar"]::after {
  counter-reset: percentage var(--value);
  content: counter(percentage) '%';
  font-family: Helvetica, Arial, sans-serif;
  font-size: calc(var(--size) / 5);
  color: var(--primary);
}

/* demo */