[CSS21] Added concrete text for the erratum for 14.2 (http://www.w3.org/Style/css2-updates/REC-CSS2-20110607-errata.html#s.14.2). The text has not yet been validated by the WG.

Author: bert-github

css2/colors.src

@@ -80,6 +80,20 @@ background for that child element. Such backgrounds must also be
 anchored at the same point as they would be if they were painted only
 for the root element.
 </p>
+
+<!-- ToDo: ask the WG to validate the following text for erratum
+http://www.w3.org/Style/css2-updates/REC-CSS2-20110607-errata.html#s.14.2 -->
+
+<p>However, if the element whose backgound would be used for the
+background of the canvas has 'display: none', or is a descendant of an
+element with 'display: none', then the canvas background is
+undefined.
+
+<p>Note that, if the element has 'visibility: hidden' but not
+'display: none', its background <em>is</em> used for the canvas.
+
+<!-- end of erratum -->
+
 <div class="html-example"><p>
 According to these rules, the canvas underlying the following 
 HTML document will have a "marble" background: