[css-pseudo-4] Tighten up text about non-applicable properties taken from originating element #7591 #9428

Author: fantasai

css-pseudo-4/Overview.bs

@@ -855,6 +855,7 @@ Styling Highlights</h3>
   whose rendering within the [[#highlight-bounds|required area]]
   is not dependent on the exact (UA-determined) bounds
   of the [=highlight overlay=].
+
   The following properties apply to the <a>highlight pseudo-elements</a>:
 
   <ul>
@@ -908,25 +909,21 @@ Styling Highlights</h3>
   applied to the text
   by the <a>originating element</a> and its ancestors and descendants.
 
-<h4>Values Resolved From Originating Elements</h4>
-  There are several properties that modify colors or resolve units but cannot be
-  used inside [=highlight pseudo-elements=], yet are important for specifyng the
-  appearance of properties that are used in the highlight. For example:
+
+  For any properties not listed above,
+  but which are required to resolve the values of applicable properties,
+  their [=computed values=] are copied from those of the [=originating element=],
+  ignoring any values specified on the [=highlight pseudo-element=] itself.
+  For example:
 
   <ul>
-    <li>'forced-color-adjust' (used with [=forced colors mode=], which [=highlight pseudo-elements=] must respect)
-    <li>'font', 'font-size', etc. used to resolve 'em' and other font-relative units.
-    <li>'line-height' used to resolve 'lh' units.
-    <li>[=custom properties=] [[!CSS-VARIABLES-1]] used as property values.
+    <li>'forced-color-adjust' (used in [=forced colors mode=] to resolve colors)
+      and 'color-scheme' (used to resolve [=system colors=])
+    <li>'font-size', 'font-family', etc. (used to resolve ''em'' and other [=font-relative lengths=]).
+    <li>'line-height' (used to resolve ''lh'' units)
+    <li>[=custom properties=] [[!CSS-VARIABLES-1]] (used in ''var()'' substitutions)
   </ul>
 
-  These properties are ignored if defined on the [=highlight pseudo-element=]
-  itself. Rather, any non-allowed property required to define the appearance of a
-  [=highlight pseudo-element=] is taken from the [=originating element=]’s
-  corresponding property. The computed style of the [=highlight pseudo-element=]
-  will include any properties taken from the originating element, even if not
-  allowed on the [=highlight pseudo-element=] itself.
-
 <!-- Add this back if for some reason someone wants to implement 'outline'?
   The outline, if supported, must be drawn
   around the union of the active portions of the <a>highlight overlay</a>