As part of bug 1579477 we want to migrate https://searchfox.org/mozilla-central/source/browser/base/content/popup-notifications.inc to Fluent.

Hey Julian,

So popup-notifications.inc is where we define the markup for the sort of notifications that we call "doorhangers" - they're the kind that anchor on a particular node with maybe a little arrow, and float on top as a panel.

Here's some (older!) documentation on those popup notifications: https://developer.mozilla.org/en-US/docs/Mozilla/Using_popup_notifications

The only DTD entities I see in this file have to do with the WebRTC notification. You can spawn those using these tools:

Camera and Microphone: https://webrtc.github.io/samples/src/content/devices/input-output/
Screen: https://webrtc.github.io/samples/src/content/getusermedia/getdisplaymedia/

Bugbug thinks this bug should belong to this component, but please revert this change in case of error.

https://hg.mozilla.org/mozilla-central/rev/9c465ec21df9

Verified fixed as part of PI 551; tested with Nightly 77 across platforms (Windows 10, macOS 10.15 and Ubuntu 18.04).