JSFiddle - React, Tailwind, and code Playground

HTML

<div>hamburgefonstiv</div>

CSS

div {
  font: 70px -apple-system;
  animation-name: 'doughnuts';
  animation-duration: 3s;
  animation-iteration-count: infinite;
  animation-direction: alternate;
}

@keyframes doughnuts {
	from {
		font-variation-settings: "wght" 1;
	}
	to {
		font-variation-settings: "wght" 1.98;
	}
}