[css-regions] add note about whitespace and named flows

Author: astearns

css3-regions/Overview.html

@@ -817,6 +817,23 @@ <h3 id=the-flow-into-property><span class=secno>3.1. </span>The ‘<a
     results.
   </div>
 
+  <div class=note><span class=note-prefix>Note </span>
+   <p>Another consequence of moving elements into named flows is that
+    surrounding whitespace is not moved into the named flow. If you have code
+    like this:
+
+   <pre>span {flow-into: span-content}
+&lt;span&gt;one&lt;/span&gt;
+&lt;span&gt;two&lt;/span&gt;
+</pre>
+   Then the ‘<code class=property>span-content</code>’ named flow
+   contents will contain this:
+   <pre>&lt;span&gt;one&lt;/span&gt;&lt;span&gt;two&lt;/span&gt;
+</pre>
+   Which will change the display from "one two" to "onetwo". If whitespace is
+   significant, then moving the parent that contains the whitespace to the
+   named flow is required.</div>
+
   <h3 id=the-flow-from-property><span class=secno>3.2. </span>The ‘<a
    href="#flow-from"><code class=property>flow-from</code></a>’ property</h3>
 

css3-regions/Overview.src.html

@@ -611,7 +611,27 @@ <h3 id="the-flow-into-property">The 'flow-into' property</h3>
           to avoid unintended results.</p> 
     </div>
 
-
+    <div class="note"><span class="note-prefix">Note </span>
+      <p>Another consequence of moving elements 
+        into named flows is that surrounding whitespace 
+        is not moved into the named flow. 
+        If you have code like this:
+<pre>span {flow-into: span-content}
+&lt;span&gt;one&lt;/span&gt;
+&lt;span&gt;two&lt;/span&gt;
+</pre>
+        Then the 'span-content' named flow contents 
+        will contain this: 
+<pre>&lt;span&gt;one&lt;/span&gt;&lt;span&gt;two&lt;/span&gt;
+</pre>
+        Which will change the display 
+        from "one two" to "onetwo".
+        If whitespace is significant, 
+        then moving the parent 
+        that contains the whitespace 
+        to the named flow 
+        is required.
+    </div>
 
 
     <h3 id="the-flow-from-property">The 'flow-from' property</h3>