Chromium native notifications already working but not in vivaldi
Vivaldi is lacking this feature
I think (correct me if I'm wrong) this is not a fully baked feature. Chromium has an initial support for desktop notifications.
Testing mine on that https://www.bennish.net/web-notifications.html, I got this
For WM desktop notification I use
gnome-notificationor other common known notification library/application (what ever their name). Vivaldi show notification in screenshot with internal Chromium way.
dunstsettings use dark theme.
Opera New show notification with native notification. Because I use
dunst, it's only text in the box. Unlike "funky" notification like in screenshot.
Chromium did same like Vivaldi.
Linux/Debian sid amd64.
Chromium 57.0.2987.133 (Debian built).