[selectors-4] Better description of :lang() psuedo class selector w3c#3022.

Also update changes.

Author: svgeesus

selectors-4/Overview.bs

@@ -2636,10 +2636,13 @@ The Language Pseudo-class: '':lang()''</h3>
 	its <a>content language</a>, as represented in BCP 47 syntax,
 	matches the given <a>language range</a> in an <i>extended filtering</i>
 	operation per [[!RFC4647]] <cite>Matching of Language Tags</cite> (section 3.3.2).
-	Both the [=content language=] and the [=language range=]
+	The [=content language=] and the [=language range=]
 	must be <i>canonicalized</i>
 	and converted to <i>extlang form</i> as per section 4.5 of [[!RFC5646]]
-	prior to the <i>extended filtering</i> operation.
+	prior to the <i>extended filtering</i> operation;
+	language tags or ranges that are not 
+	<a href="https://www.w3.org/TR/i18n-glossary/#dfn-valid">valid</a>
+	do not match anything. 
 	The matching is performed [=ASCII case-insensitively=].
 
 	The <a>language range</a>
@@ -5181,7 +5184,15 @@ Changes since the 22 January 2026 Working Draft
 		(<a href="https://github.com/w3c/csswg-drafts/issues/8720">Issue 8720</a>)
 	* Reworded constraints on language ranges
 		(<a href="https://github.com/w3c/csswg-drafts/issues/8720">Issue 8720</a>)
-	<!-- to 27 May 2026 -->
+	* Clarified that :picture-in-picture applies to the embedder element, not the PiP display
+		(<a href="https://github.com/w3c/csswg-drafts/issues/13720">Issue 13720</a>)
+	* Renamed &lt;an+b> to &lt;a-n-plus-b>
+		(<a href="https://github.com/w3c/csswg-drafts/issues/9473">Issue 9473</a>)
+	* Added CanIUse panels
+		(<a href="https://github.com/w3c/csswg-drafts/issues/1193">Issue 1193</a>)
+	 * Forbade non-valid tags/ranges from ever matching
+	 (<a href="https://github.com/w3c/csswg-drafts/issues/3022#issuecomment-4568519381">Issue 3022</a>)
+	<!-- to 2 July 2026 -->
 
 <h3 id="changes-2022-11">
 Changes since the 11 November 2022 Working Draft</h3>