<div class="box circle"></div>
<div class="box ellipse"></div>
<div class="box inset"></div>
<div class="box polygon"></div>
<div class="box svg"></div>
<div class="box animate"></div <svg class="svg">
<clipPath id="triangle" clipPathUnits="objectBoundingBox">
  <path d="M0.05,0.05 h1 v1"></path>
</clipPath>
</svg>

body {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  min-height: 100vh;
  gap: 2rem;
}
.box {
  background: teal;
  width: 200px;
  height: 200px;
}
.circle {
  clip-path: circle(50% at center);
}
.ellipse {
  clip-path: ellipse(50% 25% at 50% 50%);
}
.inset {
  clip-path: inset(10px 20px 30px 40px round 15px 50px);
}
.polygon {
  clip-path: polygon(50% 0%, 61% 35%, 98% 35%, 68% 57%, 79% 91%, 50% 70%, 21% 91%, 32% 57%, 2% 35%, 39% 35%);
}
.svg {
    clip-path: url(#triangle);
}
.animate {
    animation: move 5s infinite;
}
@keyframes move {
  0% { clip-path: polygon(0 0, 50% 0, 100% 0, 100% 50%, 100% 100%, 50% 100%, 0 100%, 0 50%); }
  50% { clip-path:  polygon(50% 50%, 50% 25%, 50% 50%, 75% 50%, 50% 50%, 50% 75%, 50% 50%, 25% 50%); }
  100% {
    clip-path: polygon(0 0, 50% 0, 100% 0, 100% 50%, 100% 100%, 50% 100%, 0 100%, 0 50%);
  }
}