Check in changes to clarify page-break collapsing behavior as resolved at TPAC 2011. <http://www.w3.org/mid/4ED50C24.6090000@inkedblade.net>

Author: fantasai

css3-page/Overview.html

@@ -2810,11 +2810,20 @@ <h3 id=allowed-pg-brk><span class=secno>9.4. </span>Allowed page breaks</h3>
       href="#page-break-before"><code
       class=property>page-break-before</code></a>’ properties of all the
       elements generating boxes that meet at this margin allow it, which is
-      when at least one of them has the value <span class=css>‘<code
-      class=property>always</code>’</span>, <span class=css>‘<code
-      class=property>left</code>’</span>, or <span class=css>‘<code
-      class=property>right</code>’</span>, or when all of them are <span
-      class=css>‘<code class=property>auto</code>’</span>.
+      when at least one of them has the value ‘<code
+      class=property>always</code>’, ‘<code
+      class=property>left</code>’, or ‘<code
+      class=property>right</code>’, or when all of them are ‘<code
+      class=property>auto</code>’. (For a box before the margin, its ‘<a
+      href="#page-break-after"><code
+      class=property>page-break-after</code></a>’ value is considered; for
+      a box after the margin its ‘<a href="#page-break-before"><code
+      class=property>page-break-before</code></a>’ value is considered.) A
+      box meets at this margin if it is one of the block-level (or table row)
+      siblings on either side of the margin or if it is a
+      block-level/table-row last child (for boxes before the margin) or first
+      child (for boxes after the margin) of a box that also meets at this
+      margin.
 
      <li><strong>Rule B:</strong> However, if all of them are <span
       class=css>‘<code class=property>auto</code>’</span> and a common

css3-page/Overview.src.html

@@ -2041,8 +2041,13 @@ <h3 id="allowed-pg-brk">Allowed page breaks</h3>
   is allowed only if the 'page-break-after' and 'page-break-before' properties
   of all the elements generating
   boxes that meet at this margin allow it, which is when at least one of them has
-  the value <span class="css">'always'</span>, <span class="css">'left'</span>,
-  or <span class="css">'right'</span>, or when all of them are <span class="css">'auto'</span>.</li>
+  the value 'always', 'left', or 'right', or when all of them are 'auto'.
+  (For a box before the margin, its 'page-break-after' value is considered;
+  for a box after the margin its 'page-break-before' value is considered.)
+  A box meets at this margin if it is one of the block-level (or table row) siblings on
+  either side of the margin or if it is a block-level/table-row last child (for boxes
+  before the margin) or first child (for boxes after the margin) of a box
+  that also meets at this margin.
   <li><strong>Rule B:</strong> However, if all of them are <span class="css">'auto'</span> and a common ancestor of all the elements has a
   <span class="property">'page-break-inside'</span> value of <span class="css">'avoid'</span>, then breaking here is not allowed.</li>
   <li><strong>Rule C:</strong> Breaking at <a href="#brk-btw-lines">(2)</a> is