WhatsApp Web gives users the chance to interact with people using the app on their desktop computer or laptop in instead of their smartphone. It works on all common web browsers including Firefox and Safari, but not Internet Explorer.
Once on the website users are prompted to scan the QR code (Quick Response code) to log in to their account. This can be done through the settings section of the app and under the WhatsApp Web/Desktop. It’ll then open up the camera, scan the QR code and then instantly log into WhatsApp.
One important thing to note is that even before scanning the QR code, the ‘keep me signed in’ option is automatically ticked meaning your WhatsApp will be accessible via your desktop whenever you visit the site. You will need to either untick the box before you log in or actively log out once you’re finished using it. Otherwise anyone else who uses the computer can access your child's WhatsApp and view their contact's information, images and send messages on their behalf. Logging out can be done by clicking on the three dots next to the person's name and from the drop-down menu there will be an option to log out.
WhatsApp says the website version is simply an extension and mirrors whatever you already have on the app. As such, all your normal conversations are displayed on screen in real time. And if you send a message via the website, it will show on the app as well. You remain logged into both the app and website version when using WhatsApp Web.
All the usual features of WhatsApp are accessible on the web-browser version and if your desktop computer has a camera then you can also take and send photos and videos of yourself. The only thing you won't be able to do is make calls through the desktop version of the app.