[css3-layout] Added some more properties that apply to ::slot(). Added

that slots rotate depending on 'writing-mode', but the grid itself
does not.

--HG--
extra : rebase_source : b84071fd136f12e617c1066f86d130f98a27034e

Author: bert-github

css-template/Overview.src.html

@@ -2237,6 +2237,10 @@ <h2 id=absolute>Elements with 'display' or ''grid'' or
 automatically with either extra rows or extra columns, if there are
 more children than predefined slots.
 
+<p>Note that the template of a grid container is also mirrored and/or
+rotated depending on the 'writing-mode' and 'direction' of the grid
+container, unlike the template of a grid element.
+
 <!--=================================================================-->
 
 <h2>Styling slots</h2>
@@ -2269,6 +2273,8 @@ <h3 id=slot-pseudo>The ''::slot()'' pseudo-element</h3>
 <ul>
 <li>background properties
 
+<li>'box-shadow'
+
 <li>'vertical-align' (see <a href="#vertical-alignment" >“vertical
 alignment”</a> below)
 
@@ -2287,6 +2293,8 @@ <h3 id=slot-pseudo>The ''::slot()'' pseudo-element</h3>
 
 <li>margin properties
 
+<li>outline properties
+
 <li>'box-decoration-break'
 
 <li>column properties
@@ -2296,6 +2304,12 @@ <h3 id=slot-pseudo>The ''::slot()'' pseudo-element</h3>
 
 <li>'opacity'
 
+<li>transform properties
+
+<li>mask properties
+
+<li>'filter'
+
 <li>'content' (see <a href="#content" >“Slots and the 'content'
 property”</a> below)
 </ul>
@@ -3949,7 +3963,7 @@ <h4 id=select-after-pseudo>Style the contents of slots (region-based
 
 <h4>Orient the grid with writing mode vs orient the slots</h4>
 
-<p>A grid can contain vertical text, but the grid itself probably
+<p>A grid can contain vertical text, but the grid itself
 doesn't need to be rotated or flipped. Indeed, it would be confusing
 if it did. In other words, the following element has vertical text in
 the top right slot and an image in the bottom right slot:
@@ -3967,6 +3981,15 @@ <h4>Orient the grid with writing mode vs orient the slots</h4>
 themselves can have a writing mode (by default the one “inherited”
 from the grid element).
 
+<p>This is different for <em>container elements,</em> i.e., elements
+with a 'display' of ''grid'' or ''inline-grid'', as those are designed
+for graphical user interfaces, where it is sometimes useful to swap a
+row of buttons, e.g., in a different language. Grids inside other
+elements (''block'', ''list-item'', ''inline-block'', ''table-cell'',
+etc.) are more likely to depend on the orientation of the page
+(landscape/portrait, recto/verso); but that has to be handled
+explicitly by the designer by means of media queries and selectors.
+
 <!--=================================================================-->
 
 <h4>Indicating the default slot ('*' vs '@')</h4>