Features.md

 **Table of Contents**
 
-[[_TOC_]]
+* [Elements](#elements)
+  * [Core Features](#core-features)
+  * [Embedded Features](#embedded-features)
+* [Attributes](#attributes)
+  * [`@source`](#source)
+  * [`@region`](#region)
+  * [`@mid`](#mid)
 
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