Fold in remaining calc() edit from <http://lists.w3.org/Archives/Public/www-style/2010Jan/0468.html> and mark items at-risk per <http://lists.w3.org/Archives/Public/www-style/2010Sep/0003.html>

Author: fantasai

css3-values/Overview.html

@@ -128,10 +128,12 @@ <h2 class="no-num no-toc" id=status>Status of this document</h2>
    represents the intention of the CSS WG better than this draft (other than
    on values and units that are new to CSS3).
 
-  <p>This is a draft of a <a href="http://www.w3.org/TR/css3-roadmap/">module
-   of CSS level 3</a>. It will probably be bundled with some other modules
-   before it becomes a <a href="http://www.w3.org/TR/#About">W3C
-   Recommendation</a>.
+  <p>The following units are at-risk and may be dropped during the CR period:
+   &lsquo;<a href="#vh-unit"><code class=css>vh</code></a>&rsquo;, &lsquo;<a
+   href="#vw-unit"><code class=css>vw</code></a>&rsquo;, &lsquo;<a
+   href="#vm-unit"><code class=css>vm</code></a>&rsquo;, &lsquo;<a
+   href="#fr-unit"><code class=css>fr</code></a>&rsquo;, &lsquo;<a
+   href="#gr-unit"><code class=css>gr</code></a>&rsquo;.
 
   <h2 class="no-num no-toc" id=contents>Table of contents</h2>
   <!--begin-toc-->
@@ -1385,11 +1387,17 @@ <h3 id=calc><span class=secno>9.1. </span> Calculations: &lsquo;<a
     return: the type of the left side
   </ol>
 
-  <p>Division by zero is a parse error.
+  <p>Division by zero is not allowed. Declarations containing such a
+   construct are invalid and must be <a
+   href="http://www.w3.org/TR/CSS21/conform.html#ignore">ignored</a>.
 
   <p>The value resulting from an expression must be clamped to the range
    allowed in the target context.
 
+  <p class=note>Note this requires all contexts accepting &lsquo;<a
+   href="#calc0"><code class=css>calc()</code></a>&rsquo; to define their
+   allowable values as a closed (not open) interval.
+
   <div class=example> These two are equivalentequivalent to &lsquo;<code
    class=css>width: 0px</code>&rsquo; since widths smaller than 0px are not
    allowed.

css3-values/Overview.src.html

@@ -76,11 +76,8 @@ <h2 class="no-num no-toc" id="status">Status of this document</h2>
 than this draft (other than on values and units that are new to
 CSS3).
 
-<p>This is a draft of a <a href="http://www.w3.org/TR/css3-roadmap/">module
-of CSS level 3</a>. It will probably be bundled with some other modules
-before it becomes a <a href="http://www.w3.org/TR/#About">W3C
-Recommendation</a>.</p>
-
+<p>The following units are at-risk and may be dropped during the
+CR period: ''vh'', ''vw'', ''vm'', ''fr'', ''gr''.
 
 <h2 class="no-num no-toc" id="contents">Table of contents</h2>
 
@@ -960,11 +957,16 @@ <h3 id="calc">
    return: the type of the left side
 </ol>
 
-<p>Division by zero is a parse error.
+	<p>Division by zero is not allowed. Declarations containing such a
+	construct are invalid and must be
+	<a href="http://www.w3.org/TR/CSS21/conform.html#ignore">ignored</a>.
 
 <p>The value resulting from an expression must be clamped to the
 range allowed in the target context.  
 
+	<p class="note">Note this requires all contexts accepting ''calc()''
+	to define their allowable values as a closed (not open) interval.
+
 <div class=example>
 These two are equivalentequivalent to 'width: 0px' since widths
 smaller than 0px are not allowed.