address the simple parts of @fantasai’s feedback

css-pseudo-4/Overview.bs

@@ -697,11 +697,11 @@ Styling Highlights</h3>
   Issue: Are there any other properties that should be included here?
 
   'color' and 'background-color'
-  are known as <dfn>highlight colors</dfn>.
+  are known as the <dfn>highlight colors</dfn>.
   Because this concept exists for compatibility reasons,
   other similar properties
   like 'fill-color' or 'stroke-color'
-  must not be treated as highlight colors.
+  are not handled as [=highlight colors=].
 
 <!-- Add this back if for some reason someone wants to implement 'outline'?
   The outline, if supported, must be drawn
@@ -715,7 +715,7 @@ Styling Highlights</h3>
 -->
 
   Note: Historically (and at the time of writing)
-  only the highlight colors have been interoperably supported.
+  only 'color' and 'background-color' have been interoperably supported.
 
 <h3 id=highlight-ua-styles>
 Default UA Styles</h3>
@@ -727,12 +727,15 @@ Default UA Styles</h3>
     :root::grammar-error  { text-decoration-line: grammar-error; }
   </pre>
 
-  Some highlight pseudo-elements
-  should have <dfn>default highlight colors</dfn>,
-  consisting of a 'color' and a 'background-color'.
-  For ''::selection'' they are
+  Some [=highlight pseudo-elements=]
+  should have <dfn>paired default highlight colors</dfn>,
+  consisting of a default 'color' and 'background-color'
+  provided by the UA
+  that are either used or overridden together,
+  see [[#paired-cascade]].
+  For ''::selection'' they should correspond to
   ''HighlightText'' and ''Highlight'',
-  while for ''::target-text'' they are
+  while for ''::target-text'' they should correspond to
   ''MarkText'' and ''Mark''.
 
   Note: the painting behavior of highlight colors
@@ -811,7 +814,8 @@ Cascading and Per-Element Highlight Styles</h3>
   of its <a>originating element</a>'s parent element
   (regardless of whether that property is an <a>inherited property</a>).
 
-  For the root element,
+  Additionally,
+  for [=highlight pseudo-elements=] originating from the root element,
   the [=inherited value=] of 'color'
   is ''currentColor'',
   not the [=initial value=].
@@ -895,14 +899,14 @@ Highlight Colors</h4>
 
   For compatibility reasons,
   [=default highlight colors=]
-  must only be [=used value|used=]
+  must only be used
   when neither of the [=highlight colors=]
   yield a [=cascaded value=]
   or [=specified value=]
-  of the [=author origin=].
+  from the [=author origin=].
   When a highlight color is ''revert'' or ''revert-layer'',
   the origin <em>after</em> rolling back the cascade
-  determines whether this is the case.
+  determines the [=cascaded value=]’s [=cascade origin|origin=].
 
   <div class="example">
     For example,
@@ -916,13 +920,10 @@ Highlight Colors</h4>
     in the <code>&lt;em></code> element
     if given by the author:
     <pre class="lang-css">
-      /* cascaded value is author origin */
       em::selection { color: initial; }
       em::selection { color: inherit; }
       em::selection { color: unset; }
       em::selection { color: green; }
-
-      /* specified value is author origin */
       p::selection { color: green; }
     </pre>
   </div>