[css-cascade-4][css-cascade-5] Add value-aliasing section. w3c#6193

Author: tabatkins

css-cascade-4/Overview.bs

@@ -443,7 +443,7 @@ Shorthand Properties</h2>
 	is equivalent to declaring all of its <a>sub-properties</a> to be ''!important''.
 
 <h3 id="aliasing">
-Aliasing</h3>
+Property Aliasing</h3>
 
 	Properties sometimes change names after being supported for a while,
 	such as vendor-prefixed properties being standardized.
@@ -603,6 +603,15 @@ Declared Values</h3>
 	These values are then processed by the <a>cascade</a>
 	to choose a single “winning value”.
 
+<h4 id="value-aliasing">
+Value Aliasing</h4>
+
+	Some [=keyword=] property values have <dfn export for=CSS lt="legacy value alias">legacy value aliases</dfn>:
+	at parse time, the legacy [=keyword=] is converted into the new [=keyword=],
+	resulting in a [=declared value=] different from the parsed input.
+	These aliases are typically used for handling legacy compatibility requirements,
+	such as converting [=vendor-prefixed=] values to their standard equivalents.
+
 <h3 id="cascaded">
 Cascaded Values</h3>
 
@@ -1315,6 +1324,15 @@ Rolling Back Cascade Origins: the ''revert'' keyword</h4>
 <h2 id="changes">
 Changes</h2>
 
+<h3 id="changes-2021-10">
+Changes since the 15 Oct 2021 Working Draft</h3>
+
+Non-trivial changes since the <a href="https://www.w3.org/TR/2021/WD-css-cascade-4-20211015/">15 October 2021 Working Draft</a>:
+
+	* Added [[#value-aliasing]] section.
+	(<a href="https://github.com/w3c/csswg-drafts/issues/6193">Issue 6193</a>)
+
+
 <h3 id="changes-2018">
 Changes Since the 28 August 2018 Candidate Recommendation</h3>
 

css-cascade-5/Overview.bs

@@ -359,7 +359,7 @@ Shorthand Properties</h2>
 	is equivalent to declaring all of its <a>sub-properties</a> to be ''!important''.
 
 <h3 id="aliasing">
-Aliasing</h3>
+Property Aliasing</h3>
 
 	Properties sometimes change names after being supported for a while,
 	such as vendor-prefixed properties being standardized.
@@ -519,6 +519,15 @@ Declared Values</h3>
 	These values are then processed by the <a>cascade</a>
 	to choose a single “winning value”.
 
+<h4 id="value-aliasing">
+Value Aliasing</h4>
+
+	Some [=keyword=] property values have <dfn export for=CSS lt="legacy value alias">legacy value aliases</dfn>:
+	at parse time, the legacy [=keyword=] is converted into the new [=keyword=],
+	resulting in a [=declared value=] different from the parsed input.
+	These aliases are typically used for handling legacy compatibility requirements,
+	such as converting [=vendor-prefixed=] values to their standard equivalents.
+
 <h3 id="cascaded">
 Cascaded Values</h3>
 
@@ -1857,9 +1866,18 @@ Rolling Back Cascade Layers: the ''revert-layer'' keyword</h4>
 Changes</h2>
 
 <h3 id="changes-2021-10">
+Changes since the 15 Oct 2021 Working Draft</h3>
+
+Non-trivial changes since the <a href="https://www.w3.org/TR/2021/WD-css-cascade-5-20211015/">15 October 2021 Working Draft</a>:
+
+	* Added [[#value-aliasing]] section.
+		(<a href="https://github.com/w3c/csswg-drafts/issues/6193">Issue 6193</a>)
+
+
+<h3 id="changes-2021-08">
 Changes since the 29 August 2021 Working Draft</h3>
 
-	Changes since the <a href="https://www.w3.org/TR/2021/WD-css-cascade-5-20210608/">8 June 2021 Working Draft</a> include:
+	Changes since the <a href="https://www.w3.org/TR/2021/WD-css-cascade-5-20210829/">29 August 2021 Working Draft</a> include:
 
 	* Revert the ordering of unlayered styles.
 		(See [[#changes-2021-06]] and
@@ -1868,7 +1886,7 @@ Changes since the 29 August 2021 Working Draft</h3>
 		instead of layers, matching update to [[CSS-CASCADE-4]].
 		(<a href="https://github.com/w3c/csswg-drafts/issues/6659">Issue 6659</a>)
 
-<h3 id="changes-2021-08">
+<h3 id="changes-2021-06">
 Changes since the 8 June 2021 Working Draft</h3>
 
 	Significant changes since the <a href="https://www.w3.org/TR/2021/WD-css-cascade-5-20210608/">8 June 2021 Working Draft</a> include:
@@ -1885,7 +1903,7 @@ Changes since the 8 June 2021 Working Draft</h3>
 	* Disallow interleaving of ''@layer'' with ''@import'' or ''@namespace'' rules.
 		(<a href="https://github.com/w3c/csswg-drafts/issues/6522">Issue 6522</a>)
 
-<h3 id="changes-2021-06">
+<h3 id="changes-2021-03">
 Changes since the 19 March 2021 Working Draft</h3>
 
 	Significant changes since the <a href="https://www.w3.org/TR/2021/WD-css-cascade-5-20210319/">19 March 2021 Working Draft</a> include:
@@ -1894,7 +1912,7 @@ Changes since the 19 March 2021 Working Draft</h3>
 		from highest to lowest priority in the normal origins.
 		(<a href="https://github.com/w3c/csswg-drafts/issues/6284">Issue 6284</a>)
 
-<h3 id="changes-2021-03">
+<h3 id="changes-2021-01">
 Changes since the 19 January 2021 Working Draft</h3>
 
 	Significant changes since the <a href="https://www.w3.org/TR/2021/WD-css-cascade-5-20210119/">19 January 2021 First Public Working Draft</a> include: