Merge pull request #27807 from element-hq/langleyd/policy-update

Update Supported Environments

README.md

@@ -17,20 +17,30 @@ React SDK](https://github.com/matrix-org/matrix-react-sdk).
 Element has several tiers of support for different environments:
 
 -   Supported
-    -   Definition: Issues **actively triaged**, regressions **block** the release
+    -   Definition:
+        -   Issues **actively triaged**, regressions **block** the release
     -   Last 2 major versions of Chrome, Firefox, and Edge on desktop OSes
     -   Last 2 versions of Safari
     -   Latest release of official Element Desktop app on desktop OSes
     -   Desktop OSes means macOS, Windows, and Linux versions for desktop devices
         that are actively supported by the OS vendor and receive security updates
--   Experimental
-    -   Definition: Issues **accepted**, regressions **do not block** the release
-    -   Element as an installed PWA via current stable version of Chrome
+-   Best effort
+    -   Definition:
+        -   Issues **accepted**, regressions **do not block** the release
+        -   The wider Element Products(including Element Call and the Enterprise Server Suite) do still not officially support these browsers.
+        -   The element web project and its contributors should keep the client functioning and gracefully degrade where other sibling features (E.g. Element Call) may not function.
+    -   Last major release of Firefox ESR and Chrome/Edge Extended Stable
+-   Community Supported
+    -   Definition:
+        -   Issues **accepted**, regressions **do not block** the release
+        -   Community contributions are welcome to support these issues
     -   Mobile web for current stable version of Chrome, Firefox, and Safari on Android, iOS, and iPadOS
 -   Not supported
     -   Definition: Issues only affecting unsupported environments are **closed**
     -   Everything else
 
+The period of support for these tiers should last until the releases specified above, plus 1 app release cycle(2 weeks). In the case of Firefox ESR this is extended further to allow it land in Debian Stable.
+
 For accessing Element on an Android or iOS device, we currently recommend the
 native apps [element-android](https://github.com/element-hq/element-android)
 and [element-ios](https://github.com/element-hq/element-ios).