File: backface-visibility-hidden-animated.html

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<!doctype html>
<html class=reftest-wait>
  <link rel="author" title="Chris Harrelson" href="mailto:chrishtr@chromium.org">
  <link rel="help" href="https://drafts.csswg.org/css-transforms-2/#propdef-backface-visibility">
  <link rel="match" href="backface-visibility-hidden-animated-ref.html">
  <style>
    @keyframes show-backface {
      0% { transform: rotateY(60deg); }
      0.01% { transform: rotateY(180deg); }
      100% { transform: rotateY(180deg); }
    }

    .flip {
      animation: 10s linear 0s infinite forwards show-backface;
      height: 100px;
      width: 100px;
      transform: rotateY(60deg);
      transform-style: preserve-3d;
    }

    #back {
      background: lightblue;
      transform: rotateY(180deg);
      position: absolute;
      top: 0;
      left: 0;
      width: 200px;
      height: 200px;
      backface-visibility: hidden;
    }

    #posabs {
      position: absolute;
      bottom: 0;
      right: 0;
      background: yellow;
    }
  </style>
  <div id="flip">
    <div id="back">
      <i id="posabs">Text</i>
    </div>
  </div>
  <script>
    onload = () => requestAnimationFrame(() => requestAnimationFrame(() => {
      flip.classList.add("flip");
      requestAnimationFrame(() => requestAnimationFrame(() =>
          document.documentElement.classList.remove("reftest-wait")));
    }));
  </script>
</html>