Comment 2 for bug 1903893

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Olivier Tilloy (osomon) wrote : Re: Notifications from Chromium snap show generic icon

Chromium uses the Desktop Notifications specification¹ to display notifications².
It sets the app_icon parameter, and according to the specification³, « The "app_icon" parameter and "image-path" hint should be either an URI (file:// is the only URI schema supported right now) or a name in a freedesktop.org-compliant icon theme (not a GTK+ stock ID). »

So a file:// prefix is expected, and correct.
Can you share more details on the problem? Maybe use dbus-monitor to watch the notifications coming in, and share the value of the app_icon parameter?

¹ https://developer.gnome.org/notification-spec
² https://source.chromium.org/chromium/chromium/src/+/master:chrome/browser/notifications/notification_platform_bridge_linux.cc;l=582
³ https://developer.gnome.org/notification-spec/#icons-and-images-formats