[css-text-4] Don't let hanging-punctuation inherit into pre elements

Closes w3c#9689

Author: frivoal

css-text-4/Overview.bs

@@ -11956,6 +11956,9 @@ Default UA Stylesheet</h2>
 
 			/* preserve character grid in preformatted text */
 			pre, code, kbd, samp, tt { text-spacing: none; }
+
+			/* Avoid hanging punctuation inheriting into preformatted blocks */
+			pre { hanging-punctuation: none; }
 		</pre>
 	</div>
 	<!--
@@ -13073,6 +13076,8 @@ Changes</h2>
 		(<a href="https://github.com/w3c/csswg-drafts/issues/9532">Issue 9532</a>)
 	* Clarify details of fullwidth punctuation collapsing.
 		(<a href="https://github.com/w3c/csswg-drafts/issues/9225">Issue 9225</a>)
+	* Prevent pre from inheriting hanging-punctuation by default with a user-agent style rule.
+		(<a href="https://github.com/w3c/csswg-drafts/issues/9689">Issue 9689</a>)
 
 	Significant changes since the <a href="https://www.w3.org/TR/2023/WD-css-text-4-20230329/">29 March 2023 Working Draft</a> include:
 	* Recast the 'text-wrap' property as a shorthand of two new properties,