[css-backgrounds-3][css-multicol-4][css-ui-4][css-gaps-1] Adjust *-width zero value special cases per WG resolution. #11494 (#11913)

Author: kbabbitt

css-backgrounds-3/Overview.bs

@@ -8,6 +8,7 @@ Level: 3
 Group: csswg
 ED: https://drafts.csswg.org/css-backgrounds/
 TR: https://www.w3.org/TR/css-backgrounds-3/
+Previous Version: https://www.w3.org/TR/2024/CRD-css-backgrounds-3-20240311/
 Previous Version: https://www.w3.org/TR/2020/CR-css-backgrounds-3-20201222/
 Previous Version: https://www.w3.org/TR/2017/CR-css-backgrounds-3-20171017/
 Previous version: https://www.w3.org/TR/2014/CR-css3-background-20140909/
@@ -2079,7 +2080,7 @@ Line Thickness: the 'border-width' properties</h3>
 	Inherited: no
 	Logical property group: border-width
 	Percentages: N/A
-	Computed value: absolute length, [=snapped as a border width=]; zero if the border style is ''border-style/none'' or ''hidden''
+	Computed value: absolute length, [=snapped as a border width=]
 	Animation Type: by computed value
 	</pre>
 
@@ -2156,6 +2157,11 @@ Line Thickness: the 'border-width' properties</h3>
 	If there are four values
 	they apply to the top, right, bottom, and left, respectively.
 
+	The [=resolved value=] for the 'border-width' properties is the [=used value=].
+
+	If the 'border-style' corresponding to a given 'border-width' is ''border-style/none'' or ''hidden'',
+	then the [=used value|used=] width is 0.
+
 	Note: Although the [=initial value|initial=] width is ''medium'',
 	the [=initial value|initial=] style is ''border-style/none'';
 	therefore the [=used value|used=] initial width is 0.
@@ -3714,6 +3720,10 @@ Changes</h2>
 Changes since the 11 March 2024 Candidate Recommendation Draft</h3>
 
 	<ul>
+		<li>Changed the special case of 'border-width' having a value of ''0'' when 'border-style' is ''border-style/none'' or ''border-style/hidden''
+			from a computed-value effect to a resolved-value effect.
+			(<a href="https://github.com/w3c/csswg-drafts/issues/11494">Issue 11494</a>)
+
 		<!-- to 5 Nov 2025 -->
 		<li>Altered the border-radius outset adjustment,
 			so the radius reduction factor in the

css-gaps-1/Overview.bs

@@ -806,7 +806,7 @@ Gap decoration width: The 'column-rule-width' and 'row-rule-width' properties</h
 		Initial: medium
 		Applies to: <a>grid containers</a>, <a>flex containers</a>, <a>multicol containers</a>, and <a>masonry containers</a>
 		Inherited: no
-		Computed value: list of absolute lengths, <a>snapped as a border width</a>, or ''0'' under conditions described below
+		Computed value: list of absolute lengths, <a>snapped as a border width</a>
 		Animation type: repeatable list, see [[#interpolation-behavior]].
 	</pre>
 
@@ -826,13 +826,6 @@ Gap decoration width: The 'column-rule-width' and 'row-rule-width' properties</h
 
 	This property sets the widths of <a>gap decorations</a>. Negative values are not allowed.
 
-	If the computed value of ''column-rule-style'' is ''border-style/none'' or ''border-style/hidden'',
-	then the computed value of ''column-rule-width'' is ''0''.
-	This behavior is for backwards compatibility with [[css-multicol-1#crw]].
-
-	Issue: Should the "force to 0" behavior apply when lists of values are involved?
-	If so, how should this be handled with unaligned lists?
-
 	<wpt>
 		grid/grid-gap-decorations-018.html
 		grid/grid-gap-decorations-019.html
@@ -1221,4 +1214,6 @@ Changes since the <a href="https://www.w3.org/TR/2025/WD-css-gaps-1-20250417/">1
 		<li>Updated trailing gap decoration assignment to use values in forward order. (<a href="https://github.com/w3c/csswg-drafts/issues/12527">Issue 12527</a>)
 		<li>Specified the interpolation behavior for values which may contain repeaters.
 			(<a href="https://github.com/w3c/csswg-drafts/issues/12431">Issue 12431</a>)
+		<li>Removed the special case of 'column-rule-width' having a computed value of ''0'' when 'column-rule-style' is ''border-style/none'' or ''border-style/hidden''.
+			(<a href="https://github.com/w3c/csswg-drafts/issues/11494">Issue 11494</a>)
 	</ul>

css-multicol-1/Overview.bs

@@ -11,6 +11,7 @@ WPT Path Prefix: /css/css-multicol/
 WPT Display: closed
 ED: https://drafts.csswg.org/css-multicol/
 TR: https://www.w3.org/TR/css-multicol-1/
+Previous Version: https://www.w3.org/TR/2024/CR-css-multicol-1-20240516/
 Previous Version: https://www.w3.org/TR/2021/CR-css-multicol-1-20211012/
 Previous Version: https://www.w3.org/TR/2021/WD-css-multicol-1-20210212/
 Previous Version: https://www.w3.org/TR/2019/WD-css-multicol-1-20191015/
@@ -1164,7 +1165,7 @@ Stacking Context</h3>
 	parsing/column-rule-style-invalid.html
 	</wpt>
 
-	The ''border-style/none'' and ''hidden'' values force the computed value of 'column-rule-width' to be ''0''.
+	The ''border-style/none'' and ''hidden'' values force the used value of 'column-rule-width' to be ''0''.
 
 
 <h3 id='crw'>The Width Of Column Rules: the 'column-rule-width' property</h3>
@@ -1176,7 +1177,7 @@ Stacking Context</h3>
 	Applies to: multicol containers
 	Inherited: no
 	Percentages: N/A
-	Computed value: absolute length, [=snapped as a border width=]; ''0'' if the column rule style is ''border-style/none'' or ''hidden''
+	Computed value: absolute length, [=snapped as a border width=]
 	Animation type: by computed value type
 	</pre>
 
@@ -2088,6 +2089,13 @@ Pagination and Overflow Outside Multicol Containers</h3>
 
 This appendix is <em>informative</em>.
 
+<h3 id="changes-from-20240516">Changes from the <a href="https://www.w3.org/TR/2024/CR-css-multicol-1-20240516/">Candidate Recommendation (CR) of 16 May 2024</a></h3>
+
+<ul>
+	<li>Removed the special case of 'column-rule-width' having a computed value of ''0'' when 'column-rule-style' is ''border-style/none'' or ''border-style/hidden''.
+		(<a href="https://github.com/w3c/csswg-drafts/issues/11494">Issue 11494</a>)
+</ul>
+
 <h3 id="changes-from-20211012">Changes from the <a href="https://www.w3.org/TR/2021/CR-css-multicol-1-20211012/">Candidate Recommendation (CR) of 12 October 2021</a></h3>
 
 <ul>

css-multicol-2/Overview.bs

@@ -8,6 +8,7 @@ Prepare for TR: no
 Work Status: Exploring
 ED: https://drafts.csswg.org/css-multicol-2/
 TR: https://www.w3.org/TR/css-multicol-2/
+Previous Version: https://www.w3.org/TR/2024/WD-css-multicol-2-20241219/
 Editor: Florian Rivoal, On behalf of Bloomberg, http://florian.rivoal.net/, w3cid 43241
 Editor: Rachel Andrew, Google, rachelandrew@google.com, w3cid 81117
 Former Editor: Håkon Wium Lie, Opera Software, howcome@opera.com, w3cid 9796
@@ -1342,7 +1343,7 @@ without caring about the <em>contents</em>.
 	parsing/column-rule-style-invalid.html
 	</wpt>
 
-	The ''border-style/none'' and ''hidden'' values force the computed value of 'column-rule-width' to be ''0''.
+	The ''border-style/none'' and ''hidden'' values force the used value of 'column-rule-width' to be ''0''.
 
 <h3 id='crw'>The Width Of Column Rules: the 'column-rule-width' property</h3>
 
@@ -1353,7 +1354,7 @@ without caring about the <em>contents</em>.
 	Applies to: multicol containers
 	Inherited: no
 	Percentages: N/A
-	Computed value: absolute length, [=snapped as a border width=]; ''0'' if the column rule style is ''border-style/none'' or ''hidden''
+	Computed value: absolute length, [=snapped as a border width=]
 	Animation type: by computed value type
 	</pre>
 
@@ -2294,6 +2295,13 @@ Pagination and Overflow Outside Multicol Containers</h3>
 
 This appendix is <em>informative</em>.
 
+<h3 id="">Changes from the <a href="https://www.w3.org/TR/2024/WD-css-multicol-2-20241219/">First Public Working Draft</a> of 19 December 2024</h3>
+
+<ul>
+	<li>Removed the special case of 'column-rule-width' having a computed value of ''0'' when 'column-rule-style' is ''border-style/none'' or ''border-style/hidden''.
+		(<a href="https://github.com/w3c/csswg-drafts/issues/11494">Issue 11494</a>)
+</ul>
+
 <h3 id="changes-from-multicol1">Changes from the <a href="https://www.w3.org/TR/2024/CR-css-multicol-1-20240516/">Candidate Recommendation (CR) of CSS-MULTICOL-1 of 16 May 2024</a></h3>
 
 <ul>

css-ui-4/Overview.bs

@@ -461,7 +461,7 @@ Outline Thickness: the 'outline-width' property</h3>
 	Applies to: all elements
 	Inherited: no
 	Percentages: N/A
-	Computed value: absolute length, [=snapped as a border width=]; ''0'' if the outline style is ''border-style/none''.
+	Computed value: absolute length, [=snapped as a border width=]
 	Animation type: by computed value
 	</pre>
 
@@ -4153,6 +4153,9 @@ Changes from the <a href="https://www.w3.org/TR/2021/WD-css-ui-4-20210316/">16 M
 
 		<li>
 			Moved 'field-sizing' and 'input-security' properties to css-forms-1.
+		
+		<li>Removed the special case of 'outline-width' having a computed value of ''0'' when 'outline-style' is ''border-style/none'' or ''border-style/hidden''.
+			(<a href="https://github.com/w3c/csswg-drafts/issues/11494">Issue 11494</a>)
 	</ul>