Re: [w3c/screen-orientation] Rewrite privacy considerations section (PR #215)

@marcoscaceres commented on this pull request.



> +      </p>
+      <ol>
+        <li>Restrict the value return by the {{ScreenOrientation/type}}
+        attribute to {{OrientationType/"portrait-primary"}} or
+        {{OrientationType/"landscape-secondary"}} to match the screen's aspect
+        ratio.
+        </li>
+        <li>Always return `0` for the value of the {{ScreenOrientation/angle}}
+        attribute.
+        </li>
+        <li>If the screen orientation changes, only fire the
+          <a data-link-for="ScreenOrientation">change</a> event when the
+          [=current orientation type=] changes from [=portrait=] to
+          [=landscape=], or vice versa. This both protects user's privacy by
+          not revealing how a device is being held, and prevents using the
+          [=secondary=] orientation as a fingerprinting vector.

oh lol, yes, that was a typo above. 

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