(I'm Brazilian, so I'm sorry about the scanning errors)
this week I tried to log in whatsapp web by Opera GX, but I'm not getting, the problem is in the browser and not on the phone because today I tried to enter by microsoft edge and managed quietly.
the QR code pops up and everything, but when I try to read the code it doesn't pick up.
To share a web address, be it in Whatsapp or whatever, tap on your browser's address bar, then long tap over the address, select “copy” and then go and paste the address in your desired Whatsapp (or whatever) chat of choice. Pretty fast and no big deal, doesn't it?