HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

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

  <title>Responsive img 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 .75rem;font-size:1.25rem;color:#0f172a}img{display:block;max-width:100%;height:auto;border-radius:8px;border:1px solid #e2e8f0}</style>

</head>

<body>

  <h1>Responsive Image</h1>

  <img src=/images/javascript.png srcset="/images/javascript.png 128w" sizes="(max-width: 600px) 100vw, 128px" alt="JavaScript logo" width=128 height=128 loading=lazy>

  <p>Resize the browser to see how <code>srcset</code> and <code>sizes</code> work.</p>

</body>

</html>

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HTML img Tag — Responsive srcset