[css-2026] Add Nesting 1 to Rough Interop w3c#12704 w3c#9793

Author: svgeesus

css-2026/Overview.bs

@@ -638,6 +638,15 @@ Modules with Rough Interoperability</h3>
 		<dd>
 			This module defines basic basic geometric interfaces to represent points, rectangles, quadrilaterals,
 			and transformation matrices.
+		<dt><a href="https://www.w3.org/TR/css-nesting-1/">CSS Nesting Module Level 1</a>
+		[[CSS-NESTING-1]]
+		<dd>
+			This module introduces the ability to nest one style rule 
+			inside another, with the selector of the child rule 
+			relative to the selector of the parent rule. 
+			This increases the modularity and maintainability of CSS stylesheets.
+		</dd>
+		</dt>
 	</dl>
 
 <h3 id="css-levels">