popup.html

<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8">
    <style>
    </style>
  </head>
  <body>
      <form id="settingsForm">
          Til addresse: <input type="text" name="toAddress" id="toAddress" placeholder="toAddress">
          <br>
          Reisemåte: <select name="travelMode" id="travelMode">
              <option value="transit">Kollektiv</option>
              <option value="driving">Bil</option>
              <option value="bicycling">Sykkel</option>
              <option value="walking">Gå</option>
          </select>
          <br>
          gMaps apiKey: <input type="password" name="apiKey" id="apiKey" placeholder="apiKey">
          <br>
          Ankomst: <input type="datetime-local" name="arrivalTime" id="arrivalTime" placeholder="arrivalTime">
          <br>
          Avreise: <input type="datetime-local" name="departureTime" id="departureTime" placeholder="departureTime">
          <br>

          <input type="submit" value="Save"></input>
          <br>
          Refresh page after save.
      </form>

    <script src="./popup.js"></script>
  </body>
</html>