[css-pseudo] Make all tree-abiding pseudos inherit from their originating element. Fixes #1646.

Author: tabatkins

css-pseudo/Overview.bs

@@ -634,6 +634,9 @@ Security and Privacy Considerations</h3>
 Tree-Abiding Pseudo-elements</h2>
 
   These pseudo-elements always fit within the box tree.
+  They <a lt="inheritance">inherit</a> any inheritable properties from their <a>originating element</a>;
+  non-inheritable properties take their <a>initial values</a> as usual.
+  [[CSS3CASCADE]]
 
 <h3 id="generated-content">
 Generated Content Pseudo-elements: ''::before'' and ''::after''</h3>
@@ -642,9 +645,6 @@ Generated Content Pseudo-elements: ''::before'' and ''::after''</h3>
   these pseudo-elements generate boxes
   as if they were immediate children of their <a>originating element</a>,
   and can be styled exactly like any normal document-sourced element in the document tree.
-  They <a lt="inheritance">inherit</a> any inheritable properties from their <a>originating element</a>;
-  non-inheritable properties take their <a>initial values</a> as usual.
-  [[CSS3CASCADE]]
 
   <dl>
     <dt><dfn>::before</dfn>