erisu commented on a change in pull request #70:
URL: 
https://github.com/apache/cordova-plugin-device-motion/pull/70#discussion_r476464366



##########
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:
       > 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.
   > 
   > Resources that are not local, to be considered secure, must meet the 
following criteria:
   > 
   > * must be served over https:// or wss:// URLs
   > * the security properties of the network channel used to deliver the 
resource must not be considered deprecated
   
   Maybe it is the `localhost` that is bypassing the Secure Context. If you ask 
Apple, I am sure they will claim that as a bug and will include the scheme as 
part of the check.




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