Re: [w3c/screen-orientation] Add interaction with WCAG 2.1 (#117)

marcoscaceres commented on this pull request.



> +        </h2>
+        <p>
+            The Web Content Accessibility Guidelines 2.1 specification [[WCAG21]] includes a Success Criterion (<a href="https://www.w3.org/TR/WCAG21/#orientation">SC 1.3.4</a>) related to screen orientation.
+        </p>
+
+        <p>
+            ​The intent of this Success Criterion is to ensure that all content and functionality is available regardless of the display
+            orientation (portrait or landscape). Some websites and applications automatically set the screen to a particular display
+            orientation and expect that users will respond by rotating their device to match.
+        </p>
+
+        <p>
+            However, some users may have their devices mounted in a fixed orientation (e.g. on the arm of a power wheelchair). Therefore,
+            websites and applications need to support both orientations by making sure content and functionality is available in
+            each orientation. While the order of content and method of functionality may have differences the content and functionality
+            must always be available. When a particular orientation is essential, the user needs to be advised of the orientation

> While the order of content and method of functionality may have differences the content and functionality must always be available. 

I don't quite understand what this means. 

> When a particular orientation is essential, the user needs to be advised of the orientation ... 

It's a bit preachy... maybe:

When a particular orientation is essential, developers should inform users of the orientation requirement. 

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