[css-gaps-1] Add spec text for assigning gap decorations to suppressed gaps for fragmentation #13754 (#13850)

* init

* nit add to changes section

* move to assignment

* Update css-gaps-1/Overview.bs

Co-authored-by: Kevin Babbitt <kbabbitt@microsoft.com>

---------

Co-authored-by: Sam Davis Omekara (from Dev Box) <samomekarajr@microsoft.com>
Co-authored-by: Kevin Babbitt <kbabbitt@microsoft.com>

Author: 3 people

css-gaps-1/Overview.bs

@@ -1811,6 +1811,11 @@ Assigning gap decoration values to gaps</h3>
 	is applied to the next gutter (or set of [=collapsed gutters=]). Therefore, [=collapsed gutters=] are treated as a
 	single [=gap=] for decoration purposes.
 
+	A gap that is suppressed due to <a href="#fragmentation">fragmentation</a>
+	still consumes a gap decoration value from the pattern, even though no decoration
+	is drawn there. This preserves a consistent association between gaps and decorations across
+	fragmented and unfragmented contexts.
+
 	<div algorithm>
 		To <dfn>assign gap decoration values</dfn> to a list of |gaps| using a list of |values|:
 
@@ -2347,6 +2352,8 @@ Changes since the <a href="https://www.w3.org/TR/2026/WD-css-gaps-1-20260227/">2
 			(<a href="https://github.com/w3c/csswg-drafts/issues/13648">Issue 13648</a>,
 			<a href="https://github.com/w3c/csswg-drafts/issues/13649">Issue 13649</a>)
 		<li>Updated with links to additional WPTs.
+		<li>Clarified that gaps suppressed due to fragmentation still consume gap decoration values.
+			(<a href="https://github.com/w3c/csswg-drafts/issues/13754">Issue 13754</a>)
 	</ul>
 
 <h3 id="changes-20250417">