allow breaks between end of content and bottom content edge, except when page-break-inside is avoid

Author: fantasai

css3-page/Overview.html

@@ -2827,6 +2827,11 @@ <h3 id=allowed-pg-brk><span class=secno>9.4 </span>Allowed page breaks</h3>
       class=property>margin-bottom</code>&rsquo; are set to zero.
 
      <li id=brk-btw-lines>Between line boxes inside a block box.
+
+     <li id=brk-end-block>Between the bottom content edge of a block box and
+      the end of its child content (bottom margin edge of the last
+      block-level child or bottom edge of the last line box) <em>if</em> the
+      distance between them is positive.
     </ol>
 
     <p>These breaks are subject to the following rules:</p>
@@ -2865,11 +2870,10 @@ <h3 id=allowed-pg-brk><span class=secno>9.4 </span>Allowed page breaks</h3>
       or more.
 
      <li><strong>Rule D:</strong> In addition, breaking at <a
-      href="#brk-btw-blocks">(2)</a> is allowed only if the &lsquo;<code
-      class=property><a
+      href="#brk-btw-blocks">(2)</a> or <a href="#brk-end-block">(3)</a> is
+      allowed only if the &lsquo;<code class=property><a
       href="#page-break-inside">page-break-inside</a></code>&rsquo; property
-      of all ancestors is <span class=css>&lsquo;<code
-      class=property>auto</code>&rsquo;</span>.
+      of all ancestors is &lsquo;<code class=css>auto</code>&rsquo;.
     </ul>
 
     <p>If the above doesn't provide enough break points to keep content from

css3-page/Overview.src.html

@@ -2009,6 +2009,10 @@ <h3 id="allowed-pg-brk">Allowed page breaks</h3>
 When an unforced page break occurs here, both the adjoining 'margin-top' and
 'margin-bottom' are set to zero.</li>
 <li id="brk-btw-lines">Between line boxes inside a block box.</li>
+<li id="brk-end-block">Between the bottom content edge of a block box and
+the end of its child content (bottom margin edge of the last block-level child
+or bottom edge of the last line box) <em>if</em> the distance between them is
+positive.
 </ol>
 
 <p>These breaks are subject to the following rules:</p>
@@ -2028,8 +2032,8 @@ <h3 id="allowed-pg-brk">Allowed page breaks</h3>
   line boxes between the break and the end of the box is the value of 'widows'
   or more.</li>
   <li><strong>Rule D:</strong> In addition, breaking at <a href="#brk-btw-blocks">(2)</a>
-  is allowed only if the 'page-break-inside' property of all ancestors is
-  <span class="css">'auto'</span>.</li>
+  or <a href="#brk-end-block">(3)</a> is allowed only if the 'page-break-inside'
+  property of all ancestors is ''auto''.</li>
 </ul>
 
 <p>If the above doesn't provide enough break points to keep content from