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<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

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

  <title>data 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}button{font:inherit;padding:.45rem .85rem;margin-bottom:.75rem;border:1px solid #cbd5e1;border-radius:6px;background:#2563eb;color:#fff;cursor:pointer}object{display:block;border:1px solid #e2e8f0;border-radius:8px}p{font-size:.875rem;color:#64748b;max-width:420px}</style>

</head>

<body>

  <h1>Swap object resource</h1>

  <button type=button id=swapBtn>Switch image</button>

  <object id=dynamicObject data=/images/javascript.png type=image/png width=128 height=128>

    <p>Resource unavailable.</p>

  </object>

  <p>Click the button to set <code>object.data</code> to a different image URL.</p>



  <script>var obj=document.getElementById("dynamicObject"),btn=document.getElementById("swapBtn"),useLogo=!1;btn.addEventListener("click",(function(){useLogo=!useLogo,obj.data=useLogo?"/images/codetofun-logo.png":"/images/javascript.png",btn.textContent=useLogo?"Show JavaScript logo":"Show site logo"}))</script>

</body>

</html>

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HTML data Attribute — JavaScript Update