Add some more notes on orthogonal flows

Author: fantasai

css3-writing-modes/Overview.src.html

@@ -1093,13 +1093,21 @@ <h4 id="orthogonal-flows">Orthogonal Flows</h4>
     layout of the box, the dimensions corresponding to the logical
     height and logical width of the containing block are determined
     using the writing mode of the box under consideration, not the
-    writing mode of the element associated with the containing block.</p>
+    writing mode of the element associated with the containing block.
+    For example, if a vertical block is placed inside a horizontal
+    block, the physical height of the horizontal block is taken as
+    the logical width of the containing block when calculating the
+    logical width (physical height) of the child block.</p>
+
 
   <p class="issue">What's a reasonable way of calculating ''auto''
     logical widths? The fallout of the above statements is not
-    reasonable. Three good options are: use the max-content size;
+    reasonable. Three options are: use the max-content size;
     use 100vh margin-box; use the same logical width that would be
-    calculated if the block flows were parallel.</p>
+    calculated if the block flows were parallel. Current recommendation
+    is to use fit-content, need to spec that.</p>
+  <p class="issue">Make sure auto margins can align a vertical box
+    inside a horizontal box.</p>
 
 <h3 id="directions">Logical vs Physical Directions</h3>