[css-display] Switch display-box to box-suppress, per proposal from fantasai and me.:

Author: tabatkins

css-display/Overview.bs

@@ -157,8 +157,8 @@ Interacting with the layout mode: the 'display-outside' property</h3>
 			and does not participate in any formatting context.
 
 			Note: This value exists for legacy reasons,
-			and interacts with the separate 'display-box' property.
-			It is recommended that 'display-box' be used to suppress an element,
+			and interacts with the separate 'box-suppress' property.
+			It is recommended that 'box-suppress' be used to suppress an element,
 			so that the element's display type is automatically preserved
 			for when it's no longer suppressed.
 
@@ -298,12 +298,12 @@ The 'display' shorthand property</h3>
 	</dl>
 
 
-<h2 id='the-display-box'>
-Controlling box generation: the 'display-box' property</h2>
+<h2 id='box-suppress'>
+Controlling box generation: the 'box-suppress' property</h2>
 
 	<pre class="propdef">
-	Name: display-box
-	Value: normal | none
+	Name: box-suppress
+	Value: show | discard | hide
 	Initial: normal
 	Applies to: all elements
 	Inherited: no
@@ -312,27 +312,35 @@ Controlling box generation: the 'display-box' property</h2>
 	Media: all
 	</pre>
 
-	The 'display-box' property is not part of the 'display' shorthand,
-	so that 'display' can be safely set without accidentally overriding whether an element is being suppressed or not.
-
 	If the computed value of 'display-outside' is ''display-outside/none'',
-	the computed value of 'display-box' is ''display-box/none''.
+	the computed value of 'box-suppress' is ''discard''.
 	Otherwise, the computed value is the specified value.
 
-	<dl dfn-type="value" dfn-for="box">
-		<dt><dfn>normal</dfn>
+	<dl dfn-type="value" dfn-for="box-suppress">
+		<dt><dfn>show</dfn>
 		<dd>
 			The element generates boxes as normal,
-			per its other 'display-*' properties.
+			per its 'display-*' properties.
 
-		<dt><dfn>none</dfn>
+		<dt><dfn>discard</dfn>
 		<dd>
 			The element generates no boxes at all.
+
+		<dt><dfn>hide</dfn>
+		<dd>
+			The element generates boxes as normal,
+			but those boxes do not participate in layout in any way,
+			and must not be displayed.
+
+			For the purpose of any layout-related information,
+			such as querying for the computed value of the element's 'width' property,
+			it must be treated as if it did not generate any boxes.
+
+			Properties that rely on boxes but do not rely on layout,
+			such as animations, 'counter-increment', etc.,
+			must work as normal on this element and its descendants.
 	</dl>
 
-	<p class='issue'>
-		Is there a need for a value that suppresses box generation for layout purposes,
-		but still generates them for the purposes of animations/counters/etc.?
 
 <h2 id='run-in'>
 Run-In Layout</h2>
@@ -413,4 +421,6 @@ Acknowledgments</h2>
 	whose last attempt with 'display-model' and 'display-role' didn't get anywhere,
 	but primed us for the current spec.
 
-	We would also like to thank the many JavaScript libraries such as jQuery which have hacked around the "what 'display' should I give it when you call .show()?" problem, making it extremely clear that something needed to be done on our part.
+	We would also like to thank the many JavaScript libraries such as jQuery
+	which have hacked around the "what 'display' should I give it when you call .show()?" problem,
+	making it extremely clear that something needed to be done on our part.