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<head>

  <meta charset=UTF-8>

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

  <title>usemap — JavaScript 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{max-width:100%;height:auto;border:1px solid #cbd5e1;border-radius:8px}button{margin:.75rem .5rem .75rem 0;padding:.45rem .85rem;border:1px solid #cbd5e1;border-radius:6px;background:#fff;cursor:pointer;font:inherit}.hint{font-size:.8125rem;color:#64748b;margin-top:.75rem}code{background:#e2e8f0;padding:.1rem .35rem;border-radius:4px}</style>

</head>

<body>

  <h1>Dynamic usemap</h1>



  <button type=button onclick=useDefaultMap()>Default map</button>

  <button type=button onclick=useAltMap()>Alternate map</button>



  <img id=dynamicImage src="data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='300' height='150' viewBox='0 0 300 150'%3E%3Crect width='300' height='150' fill='%23e2e8f0'/%3E%3Ctext x='150' y='80' text-anchor='middle' font-size='14' fill='%231e293b'%3EClick a region%3C/text%3E%3C/svg%3E" width=300 height=150 alt="Interactive diagram" usemap=#defaultMap>



  <map name=defaultMap>

    <area coords=0,0,150,150 href=https://example.com/left alt="Left half" target=_blank>

    <area coords=150,0,300,150 href=https://example.com/right alt="Right half" target=_blank>

  </map>



  <map name=altMap>

    <area shape=circle coords=150,75,60 href=https://example.com/center alt="Center circle" target=_blank>

  </map>



  <script>var img=document.getElementById("dynamicImage");function useDefaultMap(){img.useMap="#defaultMap"}function useAltMap(){img.useMap="#altMap"}</script>



  <p class=hint>Switch maps with <code>img.useMap = "#altMap"</code>. Default uses two rectangles; alternate uses one circle in the center.</p>

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HTML usemap Attribute — dynamic switch
