added note

Author: howcom

css3-gcpm/Overview.src.html

@@ -3293,12 +3293,13 @@ <h3>Aligning baselines</h3>
 </pre>
 </div>
 
-<p class=note>
+<p class=note>The <a href="http://dev.w3.org/csswg/css3-linebox/#LineStacking">line-box-contain</a> property is defined in <a href="http://dev.w3.org/csswg/css3-linebox">CSS3 module: line</a>.
+
 <!--
 http://www.w3.org/Style/Group/css3-src/css3-linebox/Overview.html#LineStacking
 -->
 
-A similar idea &mdash; 'line-stacking-strategy: grid-height' &mdash; was proposed in a <a href="http://www.w3.org/TR/css3-linebox/#line-stacking-strategy">previous CSS draft</a>. The 'line-stacking-strategy' property is <a href="http://www.w3.org/TR/xsl/#line-stacking-strategy">used in XSL</a>. 
+<p class=note>A similar idea &mdash; 'line-stacking-strategy: grid-height' &mdash; was proposed in a <a href="http://www.w3.org/TR/css3-linebox/#line-stacking-strategy">previous CSS draft</a>. The 'line-stacking-strategy' property is <a href="http://www.w3.org/TR/xsl/#line-stacking-strategy">used in XSL</a>.