HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

  <meta name=viewport content="width=device-width,initial-scale=1">

  <title>Canvas Animation Example</title>

  <style>body{font-family:system-ui,sans-serif;margin:0;padding:1.5rem;background:#f8fafc;color:#334155}h1{margin:0 0 .75rem;font-size:1.25rem;color:#0f172a}p{margin:0 0 1rem;font-size:.9rem;color:#64748b}canvas{border:1px solid #94a3b8;border-radius:6px;background:#fff}</style>

</head>

<body>

  <h1>Canvas Animation</h1>

  <p>A red square moves across the canvas.</p>

  <canvas id=demo width=400 height=150 aria-label="Animated canvas with a moving red square"></canvas>

  <script>var canvas=document.getElementById("demo"),ctx=canvas.getContext("2d"),x=0;function animate(){ctx.clearRect(0,0,canvas.width,canvas.height),ctx.fillStyle="#dc2626",ctx.fillRect(x,50,50,50),(x+=2)>canvas.width&&(x=-50),requestAnimationFrame(animate)}animate()</script>

</body>

</html>

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HTML canvas Tag — Simple Animation