chromium/third_party/blink/web_tests/http/tests/inspector-protocol/resources/animation.html

<!doctype html>
<html>
  <head>
    <title>Simple animation</title>
    <style>
      @keyframes simple-animation {
        from {
          color: red;
          transform: translateX(0%);
        }
        to {
          color: yellow;
          transform: translateX(100%);
        }
      }

      div {
        width: 200px;
        height: 200px;
        background-color: red;
        animation-name: simple-animation;
        animation-duration: 4s;
      }
    </style>
  </head>
  <body>
    <div>hello world. This Animation has an unsupported css property!</div>
  </body>
</html>