I managed to test this a little more on Android 11 and it appears different browsers behave differently.
The good news is that this works on:
- Android 11 / Chrome and Edge
- iPhone 7 Plus - iOS 15.6.1 / Safari (also tested now)
It does not work on:
- Android 11 / Firefox
- Ubuntu Budgie - Dark mode
(I corrected the browser name Firefox and dark mode option in Ubuntu Budgie in OP to avoid future confusion)
I believe these are to do with the respective OS/browser, so we could drop the case here. Most appreciate your time and proactive support.
