adding note on accessibility, rearranging other text in the multi-column model

Author: howcome

css-multicol/Overview.src.html

@@ -297,16 +297,6 @@ <h2>The multi-column model</h2>
 balanced and shortened to fit their content. Content after the
 spanning element then flows into a new row of column boxes.
 
-<p>It is not possible to set properties/values on column boxes. For
-example, the background of a certain column box cannot be set and a
-column box has no concept of padding, margin or borders.
-
-<p class="note">Future specifications may add additional
-functionality. For example, columns of different widths and different
-backgrounds may be supported.</p>
-
-<p>This specification follows the <a href="http://www.w3.org/TR/CSS21/about.html#property-defs">CSS property definition conventions</a> from [[!CSS21]]. 
-
 
 <div class="example">
 
@@ -565,6 +555,17 @@ <h2>The multi-column model</h2>
 implementation-specific limits.
 
 
+<p>It is not possible to set properties/values on column boxes. For
+example, the background of a certain column box cannot be set and a
+column box has no concept of padding, margin or borders.
+
+<p class="note">Future specifications may add additional
+functionality. For example, columns of different widths and different
+backgrounds may be supported.</p>
+
+<p class="note">Multicol elements with column heights larger than the viewpoer may pose accessibility issues. 
+
+
 <h3>Properties and values</h3>
 
 <p>This specification follows the <a href="http://www.w3.org/TR/CSS21/about.html#property-defs">CSS