[css-ruby][css-display][css-tables] Layout-internal replaced elements

 Layout-internal replaced elements behave as inline, while the outer
 ruby or table elements behave according to their outer display type.

 This addresses #6000 and refactors the edits made to implement #508
 from css-table to css-display, so that they can be shared between
 css-ruby and css-tables.

Author: frivoal

css-display-3/Overview.bs

@@ -400,6 +400,8 @@ Outer Display Roles for Flow Layout: the ''block'', ''inline'', and ''run-in'' k
 			See [[#run-in-layout]] for details.
 	</dl>
 
+	Note: [=Outer display types=] do affect [=replaced elements=].
+
 	If a <<display-outside>> value is specified but <<display-inside>> is omitted,
 	the element's <a>inner display type</a> defaults to ''flow''.
 
@@ -510,6 +512,15 @@ Layout-Internal Display Types: the ''table-*'' and ''ruby-*'' keywords</h3>
 	of elements using these 'display' values
 	are set to the given keyword.
 
+	When the 'display' property of a [=replaced element=] computes to
+	one of the [=layout-internal=] values,
+	it is handled as having a used value of ''display/inline''.
+	White space collapsing and anonymous box generation must happen around those replaced elements
+	based on that ''display/inline'' value,
+	as if they never had a [=layout-internal=] display value applied to them.
+
+	Advisement: Authors should not assign a [=layout-internal=] display value to [=replaced elements=].
+
 	The <<display-internal>> keywords are defined as follows:
 
 	<dl export dfn-type=value dfn-for="display, <display-internal>">

css-ruby-1/Overview.bs

@@ -241,6 +241,18 @@ Ruby-specific 'display' Values</h3>
 	Using the correct markup ensures that screen readers
 	and non-CSS renderers can interpret the ruby structures.
 
+	Note: [=Replaced elements=] with a 'display' value of
+	''ruby-base'',
+	''ruby-text'',
+	''ruby-base-container'',
+	and ''ruby-text-container''
+	are treated as [=inline-level boxes=],
+	as per [[css-display-3#layout-specific-display]];
+	[=replaced elements=] with a 'display' value of ''ruby'' or ''inline ruby''
+	behave according to their [=outer display type=],
+	as per [[css-display-3#outer-role]].
+	(See also [[#block-ruby]].)
+
 <h4 id="formatting-context">
 The Ruby Formatting Context</h4>
 

css-tables-3/Overview.bs

@@ -212,19 +212,21 @@ spec:css-sizing-3; type:property; text:box-sizing
 			Table captions are positioned between the table margins and its borders.
 	</dl>
 
-	<p class="advisement">
-		Authors should not assign a display type from the previous list to replaced elements (eg: input fields or images).
-		When the 'display' property of a replaced element computes to one of these values,
-			it is handled instead as though the author had declared either 
-			<code>block</code> (for <a>table</a> display) or
-			<code>inline</code> (for all other values).
-		Whitespace collapsing and box generation must happen around those replaced elements
-			like if they never had any table-internal display value applied to them,
-			and had always been block or inline.
-		<br/>
-	</p>
-
-	ISSUE(508): This is a breaking change from css 2.1 but matches implementations
+	Note: [=Replaced elements=] with a 'display' value of
+	''table-row'',
+	''table-row-group '',
+	''table-header-group'',
+	''table-footer-group'',
+	''table-column'',
+	''table-column-group'',
+	''table-cell'',
+	and ''table-caption''
+	are treated as [=inline-level boxes=],
+	as per [[css-display-3#layout-specific-display]];
+	[=replaced elements=] with a 'display' value of ''table'' or ''inline-table''
+	behave according to their [=outer display type=],
+	as per [[css-display-3#outer-role]].
+	<strong>This is a breaking change from CSS 2.1 but matches implementations.</strong>
 
 	<h4 id="terminology">Terminology</h2>