Continuing this discussion, right now we plan to support:
Last 1 Android version.
Last 1 ChromeAndroid version.
Last 2 Chrome versions.
Last 2 Firefox versions.
Last 2 Safari versions.
Last 2 iOS versions. (needs testing)
Last 2 Edge versions.
Last 2 Opera versions.
Internet Explorer >= 11. (needs testing)
Browsers with > 1% usage based on can I use browser usage table
Specifics for testing IE 11 and iOS Safari:
Admin menus, especially the ClassicPress icon in the top left and (if you have access to a multisite installation) the ClassicPress icons in the “My Sites” submenu. These are rendered differently than in WP.
The Petitions dashboard widget that is new to ClassicPress.