HTML Code

<!DOCTYPE html>
<html lang=en>
<head>
  <meta charset=UTF-8>
  <meta name=viewport content="width=device-width,initial-scale=1">
  <title>Dynamic alt Example</title>
  <style>body{font-family:system-ui,sans-serif;margin:0;padding:1.5rem;background:#f8fafc;color:#334155;line-height:1.7}h1{margin:0 0 1rem;font-size:1.25rem;color:#0f172a}.demo-img{width:120px;height:120px;border-radius:50%;display:block;background:linear-gradient(135deg,#fca5a5,#ef4444)}.hint{margin-top:1rem;font-size:.8125rem;color:#64748b;max-width:480px}</style>
</head>
<body>
  <h1>Dynamic alt</h1>
  <img id=dynamicImage class=demo-img src=data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7 alt="">
  <p class=hint>JavaScript sets <code>alt</code> to describe the image after the page loads.</p>
  <script>document.getElementById("dynamicImage").alt="Sweet red cherry fruit"</script>
</body>
</html>

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HTML alt Attribute — Dynamic JavaScript