Revision control
++ <svg viewBox="0 0 500 500" xmlns="http://www.w3.org/2000/svg">
++ <style>
++ @keyframes color {
++ 0% {stroke: red;}
++ 100% {stroke: blue;}
++ }
++ circle {
++ animation-duration: 1s;
++ animation-name: color;
++ animation-iteration-count: 1;
++ }
++ </style>
++ <circle cx="250" cy="200" r="100" stroke-width="30" stroke="white"/>
++ </svg>