[css-display-4] Add force-hidden value to visibility #10182

Author: fantasai

css-display-4/Overview.bs

@@ -1467,7 +1467,7 @@ Invisibility: the 'visibility' property</h2>
 
 	<pre class="propdef">
 	Name: visibility
-	Value: visible | hidden | collapse
+	Value: visible | hidden | force-hidden | collapse
 	Initial: visible
 	Applies to: all elements
 	Inherited: yes
@@ -1486,11 +1486,20 @@ Invisibility: the 'visibility' property</h2>
 		<dt><dfn>visible</dfn>
 		<dd>
 			The generated box is visible, as normal.
+
 		<dt><dfn>hidden</dfn>
 		<dd>
 			Any boxes generated by the element are [=invisible=].
 			Descendants of the element can, however, be visible
 			if they have ''visibility: visible''.
+
+		<dt><dfn>force-hidden</dfn>
+		<dd>
+			Any boxes generated by the element
+			<em>and its descendants</em>
+			are [=invisible=]
+			(regardless of their 'visibility' value).
+
 		<dt><dfn>collapse</dfn>
 		<dd>
 			Indicates that the box is <dfn dfn for noexport>collapsed</dfn>,
@@ -2238,7 +2247,15 @@ Acknowledgments</h2>
 <h2 class=no-num id="changes">
 Changes</h2>
 
-<h3 id="changes-2020">
+<h3 id="recent-changes">
+Recent Changes</h3>
+
+	Significant changes since the <a href="https://www.w3.org/TR/2024/WD-css-display-4-20241219/">19 December 2024 First Public Working Draft</a>:
+
+	* Added a new ''force-hidden'' value to 'visibility'.
+		(<a href="https://github.com/w3c/csswg-drafts/issues/10182">Issue 10182</a>)
+
+<h3 id="changes-L3">
 Additions since Level 3</h3>
 
 	The following features were added since <a href="https://www.w3.org/TR/css-display-3/">CSS Display Module Level 3</a>:
@@ -2247,6 +2264,7 @@ Additions since Level 3</h3>
 		(<a href="https://github.com/w3c/csswg-drafts/issues/8589#issuecomment-1721504153">Issue 8589</a>)
 	* The 'reading-order' property (<a href="https://github.com/w3c/csswg-drafts/issues/11208#issuecomment-2625850559">Issue </a>)
 	* The ability to animate 'display'
+	* The ''force-hidden'' value of 'visibility'
 
 <h2 id="priv" class="no-num">
 Privacy Considerations</h2>