There is a new web API that allows installed web apps to show a icon to warn the user about pending notifications.
Explainer: https://github.com/WICG/badging/blob/master/explainer.md
Currently, this is only available for websites who sign up to the trial, and only on Windows and Mac OS using Google Chrome. (Meta has this enabled on Light and Dark Themes).
This is how the looks on Windows:
Before a notification
After a notification
Here’s how to test this in Windows on Chrome (latest version 73, just released today):
Like so
I’ll try it out … it works!
This is very cool! On mac, it’s the same process to install the app. Then when you launch it you get a super minimal PWA window:
And the notification badge in the dock:
The huge omission here is that there is no back/forward or reload button. Kind of wish we had some minimal responsive PWA panel that we add when we detect PWA cause you can figure this out this is going on from JavaScript.
Step 1 here of course is a theme component.
You can also detect it from CSS, here is one thing I added as a theme-component to the Dark Theme here in Meta:
@media all and (display-mode: standalone) {
//blink-based browsers (don't work on safari, which exposes a JS only API for this)
::-webkit-scrollbar {
background: $secondary;
}
::-webkit-scrollbar-thumb {
background: $header_primary-medium;
}
::-webkit-scrollbar-corner {
background: $secondary;
}
//firefox
body {
scrollbar-color: $header_primary-medium $secondary;
}
}
Another day, another feature! As with any new PWA feature, I wonder how well it works with Discourse… 
I’m excited to try it out. Badge notifications for the Discourse PWA in Chrome OS sounds absolutely amazing!
We added support for the badging API back in early 2019, but we don’t call it when the app is closed at the moment as it wasn’t supported back then.
And that is changing now, right?
Falco, is there a possibility there could be a flashing or change of background colour behaviour if the notification value changes? (Cancelled by an open click) I’m not familiar with the API here.
Would love this also. Particularly useful in cases where the Branding Icon is dark and the notificaiton doesn’t show up so well.
As much as I dislike MSTeams, the gentle orange glow is ok as an example. Something like that would be a very nice touch.
A quick update on the supported browsers:
Brave: Works the same as Chrome
Click the three dots
Click App-Info
Click settings (Einstellung in German)
Configure accordingly. In this case “App beim Anmelden started” is the option we ware looking for
