Name: Web Animations API: Multiple Keyframes and Offset
Description: Master Web Animations API keyframe animations to create a smooth bouncing effect without relying on easing functions

Master Web Animations API keyframe animations to create a smooth bouncing effect without relying on easing functions

Master Web Animations API keyframe animations to create a smooth bouncing effect without relying on easing functions. This tutorial shows how to use precise positioning, offsets, and timing to control animation speed and create complex motion paths.

<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)", offset: 0.3 },
      { left: 0, top: "50%" },
      { left: "50%", top: 0 }
    ];

    const pieceAnimation = document.querySelector(".piece").animate(
      pieceKeyframes,
      {
        duration: 1500,
        iterations: Infinity
      }
    );
  </script>
</body>
</html>