When the whatsapp web is ready.
When there are no internet.
When the whatsapp web page is loading.
When the whatsapp web is connecting to smartphone after QR code scan.
When the whatsapp web is syncing messages with smartphone after a disconnection.
When the whatsapp web is syncing messages with smartphone.
When the whatsapp web couldn't connect to smartphone.
When the whatsapp web is connecting to whatsapp server.