revising text and examples on regions and exclusions

Author: howcom

css3-gcpm/Overview.src.html

@@ -3168,13 +3168,13 @@ <h3>Selecting columns</h3>
 
 <h3>Turning columns into regions</h3>
 
-<p>A column that is moved from its natural position into 
-
-<p>Columns can be moved 
+<p>A column that is moved from its natural position is called a region in this specification. Columns can be moved using floating or absolute positioning.
 
 <div class=example>
 <img alt="sample rendering" src=regions.png>
 
+<p>In this example, the multicol layout is changed so that the image (which appears first in the markup) spans two columns and is floated to the top, thereby escaping its natural column. The first column, which holds the start of the textual content is also floated to the top, spanning two columns, and therefore ends up just under the image. Du to the 'visibility: collapse' setting on the first column, the second column will move into its space. 
+
 <pre>
 article { columns: 3 }
 img { column-span: 2; width: 100%; float: top }