HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>animate implicit</title>
  <style>
    body {
      font-family: system-ui, sans-serif;
      padding: 1.5rem;
      background: #f8fafc;
    }
    #logo {
      width: 80px;
      height: 80px;
      margin: 1rem 0 1.5rem;
      border-radius: 12px;
      background: #f97316;
    }
    button {
      margin: 0 0.4rem 0.4rem 0;
      padding: 0.45rem 0.75rem;
      cursor: pointer;
    }
  </style>
</head>
<body>
  <div id="logo"></div>
  <button id="run">Current as start</button>
  <button id="run2">Current as end</button>
  <button id="run3">Current as both ends</button>
  <script>
    var logo = document.getElementById("logo");
    document.getElementById("run").addEventListener("click", function () {
      logo.animate({ transform: "translateX(300px)" }, 1000);
    });
    document.getElementById("run2").addEventListener("click", function () {
      logo.animate({ transform: "translateX(300px)", offset: 0 }, 1000);
    });
    document.getElementById("run3").addEventListener("click", function () {
      logo.animate({ transform: "translateX(300px)", offset: 0.5 }, 1000);
    });
  </script>
</body>
</html>

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Element.animate — implicit keyframes (Try It)