Update web support section

Author: brentvatne

docs/web-support.md

@@ -1,10 +1,22 @@
 ---
 id: web-support
 title: React Navigation on the Web
-sidebar_label: Web Support
+sidebar_label: Web support
 ---
 
-Starting in v3, React Navigation has built-in support for web sites, including server rendering.
+> Note: starting in v3, React Navigation has built-in support for use in web sites, including server rendering. This has not yet been widely used in production and we consider this feature to be experimental.
+
+# With react-native-web
+
+> "[React Native for Web](https://github.com/necolas/react-native-web)" makes it possible to run React Native components and APIs on the web using React DOM.
+
+This approach allows you to reuse most of React Navigation on the web because React Native for Web maps React Native primitives like `View`, `Text`, and others to their equivalents on the web.
+
+The easiest way to get started with this approach is to use to use the [Expo CLI web support beta](https://blog.expo.io/expo-cli-and-sdk-web-support-beta-d0c588221375). More information on how to set this up in other projects will follow in the future, help on documenting it is also welcome!
+
+# With standard web tools
+
+This approach requires that you rebuild the navigation views for your app (at least until the community builds out an alternative), but allows you to leverage routers and simple navigators that don't require views, like the switch navigator.
 
 To set up a navigator in a React app, [(such as one created with create-react-app)](https://github.com/react-navigation/example-web):
 

website/versioned_docs/version-3.x/web-support.md

@@ -1,11 +1,23 @@
 ---
 id: version-3.x-web-support
-title: React Navigation on the Web
-sidebar_label: Web Support
 original_id: web-support
+title: React Navigation on the Web
+sidebar_label: Web support
 ---
 
-Starting in v3, React Navigation has built-in support for web sites, including server rendering.
+> Note: starting in v3, React Navigation has built-in support for use in web sites, including server rendering. This has not yet been widely used in production and we consider this feature to be experimental.
+
+# With react-native-web
+
+> "[React Native for Web](https://github.com/necolas/react-native-web)" makes it possible to run React Native components and APIs on the web using React DOM.
+
+This approach allows you to reuse most of React Navigation on the web because React Native for Web maps React Native primitives like `View`, `Text`, and others to their equivalents on the web.
+
+The easiest way to get started with this approach is to use to use the [Expo CLI web support beta](https://blog.expo.io/expo-cli-and-sdk-web-support-beta-d0c588221375). More information on how to set this up in other projects will follow in the future, help on documenting it is also welcome!
+
+# With standard web tools
+
+This approach requires that you rebuild the navigation views for your app (at least until the community builds out an alternative), but allows you to leverage routers and simple navigators that don't require views, like the switch navigator.
 
 To set up a navigator in a React app, [(such as one created with create-react-app)](https://github.com/react-navigation/example-web):