Sometimes there are questions about WhatsApp, that are not actually related to the web application, like
WhatsApp group with hidden numbers?.
The thing is, that on WhatsApp, the app is exclusively dependent on the smartphone. So there's actually no existence to the web app without the phone (unlike other options like Telegram, Hangouts etc.).
So although it's true that WhatsApp has a web version, the question isn't related to the web application, rather to the platform / basic features.