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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>selected — JavaScript</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}select{padding:.5rem .75rem;font:inherit;border:1px solid #cbd5e1;border-radius:6px;min-width:200px}.hint{margin-top:1rem;font-size:.8125rem;color:#64748b;max-width:480px}code{background:#e2e8f0;padding:.1rem .35rem;border-radius:4px}</style>

</head>

<body>

  <h1>select.value = "saab"</h1>

  <select id=dynamicSelect aria-label="Car brands">

    <option value=volvo>Volvo</option>

    <option value=saab>Saab</option>

    <option value=mercedes>Mercedes</option>

    <option value=audi>Audi</option>

  </select>

  <p class=hint>Saab is selected by JavaScript: <code>document.getElementById("dynamicSelect").value = "saab"</code></p>

  <script>var conditionMet=!0;conditionMet&&(document.getElementById("dynamicSelect").value="saab")</script>

</body>

</html>

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HTML selected Attribute — Dynamic JavaScript Selection