Added more alternative names for the parts of a grid as found in some

books on grid-based layout. Added idea from June 2013 ftf for a
property to switch a grid element between flowing its descendants
(with flow/flow-into) and absolute positioning them (with grid-area).

--HG--
extra : rebase_source : e95dde7cb87dd24d18add3dff25fedc44c218d46

Author: bert-github

css-template/Overview.src.html

@@ -172,13 +172,17 @@ <h3>Summary and use cases</h3>
 
 <p class=note>In some typographical traditions, the slots are called
 “<span class=index title="field (of a typographical
-grid)">fields</span>.”  Traditionally, also, all columns have the same
-width, called the “<span class=index title="module (of a typographical
-grid)">module</span>” or “<span class=index title="unit (of a
-typographical grid)">unit</span>,” so that the width of a field is
-always a multiple of the module. This specification does not use those
-terms, because equal-width columns is merely the default in CSS, which
-means the grid does not necessarily have a “module.”
+grid)">fields</span>” or “<span class=index title="spatial
+zone">spatial zones.</span>” Traditionally, also, all columns have the
+same width, called the “<span class=index title="module (of a
+typographical grid)">module</span>” or “<span class=index title="unit
+(of a typographical grid)">unit</span>.” The horizontal lines of a
+grid that define the rows are sometimes called “<span class=index
+title="flow line">flow lines.</span>” Some traditions make the space
+between pieces of content an explicit part of the grid, some consider
+the space part of the content: Both styles are possible in CSS, the
+latter by using the 'margin' property, the former by using the '.'
+symbol in a grid template.
 
 <p>The typical use cases for these properties include:
 
@@ -2192,10 +2196,24 @@ <h3>Stacking elements on top of a grid: 'grid-area' and 'grid-auto'</h3>
 </table>
 
 <div class=issue>
+<p>In [[CSS3-GRID-LAYOUT]] (version of April 2013) there is no
+'grid-area: none' but 'grid-area' only applies when 'position' is set
+to 'grid' (a new keyword).
+
+<p>There was also discussion (at the June 2013 ftf) to set a property
+on the grid element itself to enable positioning of descendants. When
+set (e.g., 'grid-mode: absolute'), all children are placed by means of
+their 'grid-area' property, when not set ('grid-mode: normal'),
+'grid-area' is ignored. That would preclude mixing flowing and
+positioned descendants (except, perhaps, if it is an inherited
+property and descendants can override it).
+
 <p>At the Aug 2012 ftf, Florian suggested a property 'collision: auto
 | collide | avoid' to switch between overlapping and not overlapping.
 (It would avoid collisions for absolutely positioned elements as
-well.) Instead of two properties 'flow' and 'grid-area', we could have
+well.)
+
+<p>Instead of two properties 'flow' and 'grid-area', we could have
 just one, and then toggle between overlapping and flowing with the
 'collision' property.