timbru31 commented on a change in pull request #70:
URL: 
https://github.com/apache/cordova-plugin-device-motion/pull/70#discussion_r476547976



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File path: README.md
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@@ -27,12 +27,172 @@ description: Access accelerometer data.
 
 # cordova-plugin-device-motion
 
+# Usage Notice
+
+With the [W3C Device Orientation 
API](https://www.w3.org/TR/orientation-event/), Android, iOS, and Windows 
devices may not need this plugin anymore.
+
+However, for iOS 13+, a [secure 
context](https://developer.mozilla.org/en-US/docs/Web/Security/Secure_Contexts) 
is required. Apple does not allow access to the device’s motion or the 
permission request from an insecure browsing context.
+
+If you use a custom scheme, i.e., the `app` protocol, for your iOS app, the 
browsing context is considered insecure. To solve this problem and be able to 
use the device motion feature, this plugin will be necessary on iOS 13+.

Review comment:
       ```suggestion
   However, for iOS 13+, a [secure 
context](https://developer.mozilla.org/en-US/docs/Web/Security/Secure_Contexts) 
is required. Apple does not allow access to the device’s motion or the 
permission request from an insecure browsing context. Locally-delivered 
resources such as those with http://127.0.0.1 URLs, http://localhost URLs 
(under certain conditions), and file:// URLs are also considered to have been 
delivered securely.
   
   If you use a custom hostname, i.e., something else than `localhost`, for 
your iOS app, the browsing context is considered insecure. To solve this 
problem and be able to use the device motion feature, this plugin will be 
necessary on iOS 13+.
   ```
   
   How about this? I'd like to avoid gambling's about Tim Apple's future 
decisions if they forgot to check the protocol or not.




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