The difference is in breadth: - Page Visiblility is fully supported by all browsers except Opera Mini, and has been for a while - Same with Intl (aditionally

The difference is in breadth: - Page Visiblility is fully supported by all browsers except Opera Mini, and has been for a while - Same with Intl (aditionally except KaiOS) - Broadcast is supported by everyone but Opera Mini and Internet Explorer - Web Share is only fully supported by Safari, Edge, and some Android browsers (Chrome, Samsung, Firefox, Opera Mobile), Chrome only has partial support because only Windows and ChromeOS That means you can use the first 3 rather reliably, while Web Share is a lot more of a crapshoot.