Use 'demonstrate to be' wording

Author: fantasai

css-2007/Overview.html

@@ -15,11 +15,11 @@
 
    <h1>Cascading Style Sheets (CSS) Snapshot 2007</h1>
 
-   <h2 class="no-num no-toc" id=w3c-note-date>W3C Note 2 May 2011</h2>
+   <h2 class="no-num no-toc" id=w3c-note-date>W3C Note 4 May 2011</h2>
 
    <dl>
     <dt>This version:</dt>
-    <!-- <dd><a href="http://www.w3.org/TR/2011/WD-css-beijing-20110502/">http://www.w3.org/TR/2011/CR-css-beijing-20110502/</a></dd> -->
+    <!-- <dd><a href="http://www.w3.org/TR/2011/WD-css-beijing-20110504/">http://www.w3.org/TR/2011/CR-css-beijing-20110504/</a></dd> -->
 
     <dd><a
      href="http://dev.w3.org/csswg/css-2007/">http://dev.w3.org/csswg/css-2007/</a>
@@ -353,5 +353,5 @@ <h3 id=experimental><span class=secno>3.3. </span>Experimental
    CSS Working Drafts also use vendor-prefixed property or value names. This
    avoids any incompatibilities with future changes in the draft. Once a
    specification reaches the Candidate Recommendation stage, implementors
-   should implement the non-prefixed syntax for any feature they consider to
-   be correctly implemented according to spec.
+   should implement the non-prefixed syntax for any feature they can
+   demonstrate to be correctly implemented according to spec.

css-2007/Overview.src.html

@@ -247,5 +247,5 @@ <h3 id="experimental">Experimental Implementations</h3>
 CSS Working Drafts also use vendor-prefixed property or value names. This
 avoids any incompatibilities with future changes in the draft. Once a
 specification reaches the Candidate Recommendation stage, implementors
-should implement the non-prefixed syntax for any feature they consider to
-be correctly implemented according to spec.</p>
+should implement the non-prefixed syntax for any feature they can demonstrate
+to be correctly implemented according to spec.</p>