Negative lengths are illegal for 'size'. <http://www.w3.org/mid/AANLkTinN_rZLWgwUrpho_9ajfT3OsSOchY5_J4ooJdJG@mail.gmail.com>

Author: fantasai

css3-page/Overview.html

@@ -2220,6 +2220,7 @@ <h3 id=page-size-prop><span class=secno>8.1. </span>Page size: the ‘<a
         the page box height. Values in units of <span class=css>‘<code
         class=property>em</code>’</span> and <span class=css>‘<code
         class=property>ex</code>’</span> refer to the page context's font.
+        Negative lengths are illegal.
 
       <tr>
        <td>&lt;page-size&gt;

css3-page/Overview.src.html

@@ -1581,7 +1581,7 @@ <h3 id="page-size-prop">Page size: the 'size' property</h3>
 the box is a square). If two length values are specified, the first establishes
 the page box width, and the second the page box height. Values in units of
 <span class="css">'em'</span> and <span class="css">'ex'</span> refer to the
-page context's font.</td>
+page context's font. Negative lengths are illegal.</td>
 </tr>
 <tr>
 <td>&lt;page-size&gt;</td>