OneSignal HTML

 <script src="https://cdn.onesignal.com/sdks/web/v16/OneSignalSDK.page.js" defer></script>

<script>

  window.OneSignalDeferred = window.OneSignalDeferred || [];

  OneSignalDeferred.push(async function(OneSignal) {

    await OneSignal.init({

      appId: "a9958bae-7e1c-4d17-9b74-d0d09f2041f9",

    });

  });

</script>