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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>Dynamic checked 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}label{cursor:pointer;user-select:none}.hint{margin-top:1rem;font-size:.8125rem;color:#64748b;max-width:420px}</style>

</head>

<body>

  <h1>Dynamic .checked</h1>

  <input type=checkbox id=dynamicCheckbox>

  <label for=dynamicCheckbox>Check me dynamically</label>

  <p class=hint>JavaScript sets <code>element.checked = true</code>. Use the property, not <code>checked="false"</code>, to uncheck.</p>

  <script>document.getElementById("dynamicCheckbox").checked=!0</script>

</body>

</html>

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HTML checked Attribute — Dynamic JavaScript