[css-cascade-4][css-cascade-5] Give presentational hits their own origin. #6659

Author: fantasai

css-cascade-4/Overview.bs

@@ -1163,19 +1163,24 @@ Precedence of Non-CSS Presentational Hints</h3>
 	The UA may choose to honor presentational hints in a source document's markup,
 	for example the <code>bgcolor</code> attribute or <{s}> element in [[HTML]].
 	All document language-based styling must be translated to corresponding CSS rules
-	and either enter the cascade as [=UA-origin=] rules or
-	be treated as [=author-origin=] rules with a specificity of zero
-	placed at the start of the [=author style sheet=].
+	and enter the cascade as rules in either
+	the [=UA-origin=] or a special-purpose <dfn>author presentational hint origin</dfn>
+	between the regular [=user origin=] and the [=author origin=].
+	For the purpose of [=cascading=]
+	this [=author presentational hint origin=] is treated as an independent [=origin=],
+	but for the purpose of the ''revert'' keyword
+	it is considered part of the [=author origin=].
+
 	A document language may define whether such a presentational hint
 	enters the [=cascade=] as [=UA-origin=] or [=author-origin=];
 	if so, the UA must behave accordingly.
-	For example, [[SVG11]] maps its presentation attributes into the author level.
+	For example, [[SVG11]] maps its presentation attributes into the [=author origin=].
 
 	Note: Presentational hints entering the [=cascade=] as [=UA-origin=] rules
 	can be overridden by [=author-origin=] or [=user-origin=] styles.
-	Presentational hints entering the cascade as [=author-origin=] rules
+	Presentational hints entering the cascade as [=author presentational hint origin=] rules
 	can be overridden by [=author-origin=] styles,
-	but not by non-important [=user-origin=] styles.
+	but not by non-[=important=] [=user-origin=] styles.
 	Host languages should choose the appropriate origin for presentational hints
 	with these considerations in mind.
 
@@ -1311,6 +1316,17 @@ Changes</h2>
 <h3 id="changes-2018">
 Changes Since the 28 August 2018 Candidate Recommendation</h3>
 
+	Non-trivial changes since the <a href="https://www.w3.org/TR/2021/WD-css-cascade-4-20210319/">19 March 2021 Working Draft</a> include:
+
+	<ul class=non-normative>
+		<li id="change-2021-preshint-origin">
+			Defined [=author presentational hint origin=] to handle author-origin presentational hints,
+			instead of relying on zero-specificity and source order,
+			to correctly define their interaction with the [=encapsulation context=]
+			aspect of the cascade.
+			(<a href="https://github.com/w3c/csswg-drafts/issues/6659">Issue 66749</a>)
+	</ul>
+
 	Non-trivial changes since the <a href="https://www.w3.org/TR/2020/WD-css-cascade-4-20200818/">18 August 2020 Working Draft</a> include:
 
 	<ul class=non-normative>

css-cascade-5/Overview.bs

@@ -1699,17 +1699,22 @@ Precedence of Non-CSS Presentational Hints</h3>
 	The UA may choose to honor presentational hints in a source document's markup,
 	for example the <code>bgcolor</code> attribute or <{s}> element in [[HTML]].
 	All document language-based styling must be translated to corresponding CSS rules
-	and either enter the cascade as [=UA-origin=] rules or
-	be treated as [=author-origin=] rules in their own [=cascade layer=]
-	placed as the lowest [=layer=] in the [=author origin=].
+	and enter the cascade as rules in either
+	the [=UA-origin=] or a special-purpose <dfn>author presentational hint origin</dfn>
+	between the regular [=user origin=] and the [=author origin=].
+	For the purpose of [=cascading=]
+	this [=author presentational hint origin=] is treated as an independent [=origin=],
+	but for the purpose of the ''revert'' keyword
+	it is considered part of the [=author origin=].
+
 	A document language may define whether such a presentational hint
 	enters the [=cascade=] as [=UA-origin=] or [=author-origin=];
 	if so, the UA must behave accordingly.
 	For example, [[SVG11]] maps its presentation attributes into the [=author origin=].
 
 	Note: Presentational hints entering the [=cascade=] as [=UA-origin=] rules
 	can be overridden by [=author-origin=] or [=user-origin=] styles.
-	Presentational hints entering the cascade as [=author-origin=] rules
+	Presentational hints entering the cascade as [=author presentational hint origin=] rules
 	can be overridden by [=author-origin=] styles,
 	but not by non-[=important=] [=user-origin=] styles.
 	Host languages should choose the appropriate origin for presentational hints
@@ -1867,6 +1872,9 @@ Changes since the 29 August 2021 Working Draft</h3>
 	* Revert the ordering of unlayered styles.
 		(See [[#changes-2021-06]] and
 		<a href="https://github.com/w3c/csswg-drafts/issues/6284">Issue 6284</a>)
+	* Defined presentational hints to use the [=author presentational hint origin=]
+		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">
 Changes since the 8 June 2021 Working Draft</h3>