add note about default namespaces changing interpretation of selectors

Author: fantasai

css3-namespace/Overview.html

@@ -15,11 +15,11 @@
 
    <h1 id=css-namespaces>CSS Namespaces Module</h1>
 
-   <h2 class="no-num no-toc" id=longstatus>Editor's Draft 11 March 2008</h2>
+   <h2 class="no-num no-toc" id=longstatus>Editor's Draft 2 April 2008</h2>
 
    <dl>
     <dt>This version:</dt>
-    <!--    <dd><a href="http://www.w3.org/TR/2008/WD-css3-namespace-20080311/">http://www.w3.org/TR/2008/WD-css3-namespace-20080311/</a></dd> -->
+    <!--    <dd><a href="http://www.w3.org/TR/2008/WD-css3-namespace-20080402/">http://www.w3.org/TR/2008/WD-css3-namespace-20080402/</a></dd> -->
 
     <dd><a
      href="http://dev.w3.org/csswg/css3-namespace/">http://dev.w3.org/csswg/css3-namespace/</a>
@@ -356,6 +356,13 @@ <h3 id=prefixes><span class=secno>3.3 </span>Declaring Prefixes</h3>
     must define how those unqualified names are to be interpreted when no
     default namespace is declared.</p>
 
+   <p class=note>Note that using default namespaces in conjunction with type
+    selectors can cause UAs that support default namespaces and UAs that
+    don't support default namespaces to interpret selectors differently. See
+    <a href="http://www.w3.org/TR/css3-selectors/#downlevel">Namespaces and
+    down-level clients</a> in the Selectors module <a href="#SELECT"
+    rel=biblioentry>[SELECT]<!--{{SELECT}}--></a> for details.</p>
+
    <p>Namespace prefixes are, <a
     href="http://www.w3.org/TR/CSS21/syndata.html#counter">like CSS counter
     names</a>, case-sensitive.</p>

css3-namespace/Overview.src.html

@@ -242,6 +242,12 @@ <h3 id="prefixes">Declaring Prefixes</h3>
     names to the default namespace must define how those unqualified names are
     to be interpreted when no default namespace is declared.</p>
 
+  <p class="note">Note that using default namespaces in conjunction with type
+    selectors can cause UAs that support default namespaces and UAs that don't
+    support default namespaces to interpret selectors differently. See
+    <a href="http://www.w3.org/TR/css3-selectors/#downlevel">Namespaces and
+    down-level clients</a> in the Selectors module [[SELECT]] for details.</p>
+
   <p>Namespace prefixes are, <a href="http://www.w3.org/TR/CSS21/syndata.html#counter">like
     CSS counter names</a>, case-sensitive.</p>