HTML Code

<!DOCTYPE html>
<html lang=en>
<head>
  <meta charset=UTF-8>
  <meta name=viewport content="width=device-width,initial-scale=1">
  <title>alt Attribute 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:280px;max-width:100%;height:160px;object-fit:cover;border-radius:8px;display:block;background:linear-gradient(135deg,#93c5fd,#3b82f6)}.hint{margin-top:1rem;font-size:.8125rem;color:#64748b;max-width:480px}</style>
</head>
<body>
  <h1>Descriptive alt text</h1>
  <img class=demo-img src=data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7 alt="A scenic view of a mountain landscape">
  <p class=hint>If the image fails to load, the browser shows the alt text instead.</p>
</body>
</html>

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HTML alt Attribute — Descriptive Alt Text