[css-cascade-4][css-cascade-5] Clarify that revert/revert-layer affect all aliases of a property. w3c#7054

Author: fantasai

css-cascade-4/Overview.bs

@@ -1287,6 +1287,12 @@ Rolling Back Cascade Origins: the ''revert'' keyword</h4>
 			For the purpose of ''revert'', this origin includes the Animation <a>origin</a>.
 	</dl>
 
+	Note: Effectively the ''revert'' keyword is substituted with
+	the value from the earlier [=cascade origin=].
+	Thus, reverting a [=shorthand property=] reverts all its longhands;
+	reverting any [[#aliasing|property alias]] of a property reverts all of them;
+	reverting one of the paired properties in a [=logical property group=]
+	also reverts the other one; etc.
 
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@@ -1307,6 +1313,7 @@ Changes</h2>
 Non-trivial changes since the <a href="https://www.w3.org/TR/2022/CR-css-cascade-4-20220113/">13 Jan 2022 Candidate Recommendation Snapshot</a>:
 
 <!-- to 11 Jan 2022  -->
+	* Clarify that all “aliases” of a property are reverted by ''revert''.
 
 <h3 id="changes-2021-10">
 Changes since the 15 Oct 2021 Working Draft</h3>

css-cascade-5/Overview.bs

@@ -1874,12 +1874,22 @@ Rolling Back Cascade Origins: the ''revert'' keyword</h4>
 			For the purpose of ''revert'', this origin includes the Animation <a>origin</a>.
 	</dl>
 
+	Note: Effectively the ''revert'' keyword is substituted with
+	the value from the earlier [=cascade origin=].
+	Thus, reverting a [=shorthand property=] reverts all its longhands;
+	reverting any [[#aliasing|property alias]] of a property reverts all of them;
+	reverting one of the paired properties in a [=logical property group=]
+	also reverts the other one; etc.
+
 <h4 id="revert-layer">
 Rolling Back Cascade Layers: the ''revert-layer'' keyword</h4>
 
+	The <dfn value for=all>revert-layer</dfn> keyword
+	rolls back the cascade similar to ''revert'',
+	except it works by [=cascade layer=] rather than by [=cascade origin=].
 	If the <a>cascaded value</a> of a property is
-	the <dfn value for=all>revert-layer</dfn> keyword,
-	the <a>cascaded value</a> is rolled back to the [=layer=] below,
+	the ''revert-layer'' keyword,
+	the <a>cascaded value</a> is rolled back to the earlier [=layer=],
 	so that the <a>specified value</a> is calculated
 	as if no rules were specified in the current [=cascade layer=]--
 	or between its [=normal=] and [=important=] levels in the [=cascade=]--
@@ -1985,6 +1995,7 @@ Changes since the 13 Jan 2022 Candidate Recommendation Snapshot</h3>
 Non-trivial changes since the <a href="CSS Cascading and Inheritance Level 5">Candidate Recommendation Snapshot</a>:
 
 <!-- to 11 Jan 2022 -->
+	* Clarify that all “aliases” of a property are reverted by ''revert''/''revert-layer''.
 
 <h3 id="changes-2021-10">
 Changes since the 15 Oct 2021 Working Draft</h3>