Name: Web Animations API: Sync Animations with getComputedTiming
Description: Master computed timing to keep your keyframe animations flexible and error-free.

Master computed timing to keep your keyframe animations flexible and error-free.

Sync animations perfectly without hardcoding durations. Master computed timing to keep your keyframe animations flexible and error-free.

<html>
<head>
  <style>
    body {
      background-color: #222;
    }
    .container {
      position: relative;
      width: 500px;
      height: 500px;
      border: 1px solid #fff;
      margin: 0 auto;
    }
    .piece {
      position: absolute;
      background-color: white;
      border-radius: 100%;
      width: 15px;
      height: 15px;
    }
  </style>
</head>
<body>
  <div class="container">
    <div class="piece"></div>
  </div>

  <script>
    const pieceKeyframes = [
      { left: "50%", top: 0 },
      { left: "calc(100% - 12px)", top: "50%" },
      { left: "50%", top: "calc(100% - 12px)" },
      { left: 0, top: "50%" },
      { left: "50%", top: 0 }
    ];

    const pieceAnimate = document.querySelector(".piece").animate(
      pieceKeyframes,
      {
        duration: 3500,
        iterations: Infinity
      }
    );

    const containerAnimate = document.querySelector(".container").animate(
      [
        { borderColor: "orange" },
        { borderColor: "white" }
      ],
      {
        duration: pieceAnimate.effect.getComputedTiming().duration / 4,
        iterations: Infinity
      }
    );
  </script>
</body>
</html>