[css-variables] typo, bikeshed fixes

Author: tabatkins

css-variables/Overview.bs

@@ -16,6 +16,10 @@ Editor: Tab Atkins Jr., Google, http://xanthir.com/contact
 Abstract: This module introduces cascading variables as a new primitive value type that is accepted by all CSS properties, and custom properties for defining them.
 </pre>
 
+<pre class=link-defaults>
+spec:css-syntax-3; type:dfn; text:identifier
+</pre>
+
 <h2 id="intro">
 Introduction</h2>
 
@@ -643,7 +647,7 @@ AAAAAAA                   AAAAAAAPPPPPPPPPP          IIIIIIIIII
 <h2 id='apis'>
 APIs</h2>
 
-	All <a>custom property</a> <a>declarations</a> have the <var>case-insensitive</var> flag set.
+	All <a>custom property</a> <a>declarations</a> have the <a for="CSS declaration" spec=cssom>case-sensitive flag</a> set.
 
 	Note: Custom properties do not appear on a CSSStyleDeclaration object in camel-cased form,
 	because their names may have both upper and lower case letters
@@ -684,3 +688,10 @@ Acknowledgments</h2>
 		François Remy,
 		Roland Steiner,
 		and Shane Stephens.
+
+Privacy and Security Considerations {#priv-sec}
+===============================================
+
+This specification defines a purely author-level mechanism for passing styling information around within a page they control.
+
+As such, there are no new privacy or security considerations.