Important note on playing audio-visual media
To play audio and video content, the relevant
browser settings (selection) must be enabled:
Safari Settings Websites Allow for all media
Firefox Settings Privacy & Security Autoplay
Allow Audio and Video
Google Chrome Settings Privacy & Security Site settings Autoplay
Vivaldi Settings Websites Default permissions Sound: Allow
Microsoft Edge Settings Advanced Site settings
Automatic media playback: Allow
Opera Settings Websites Plug-ins Run all plug-in content