HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

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

  <title>shape — default</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}img{max-width:100%;border:1px solid #cbd5e1;border-radius:6px;display:block}.hint{margin-top:1rem;font-size:.8125rem;color:#64748b;max-width:520px}</style>

</head>

<body>

  <h1>shape="default"</h1>

  <img src="data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='280' height='100'%3E%3Crect fill='%23f1f5f9' width='280' height='100'/%3E%3Crect x='20' y='25' width='80' height='50' fill='%23cbd5e1'/%3E%3Ctext x='60' y='55' text-anchor='middle' fill='%23334155' font-family='system-ui' font-size='12'%3EHome%3C/text%3E%3C/svg%3E" alt="Navigation diagram" usemap=#navMap width=280 height=100>

  <map name=navMap>

    <area coords=20,25,100,75 href=# alt="Home button" onclick='return alert("Home rect area"),!1'>

    <area shape=default href=# alt="Rest of diagram" onclick='return alert("Default — rest of image"),!1'>

  </map>

  <p class=hint>Click the Home box for the <code>rect</code> area; click elsewhere for <code>default</code>.</p>

</body>

</html>

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HTML shape Attribute — default Fallback Region