Make the paragraph about the return type of attr() changing into a note.

Author: tabatkins

css3-values/Overview.html

@@ -1611,20 +1611,20 @@ <h3 id=attr-notation><span class=secno>8.3. </span> Attribute References:
    returns the value of the attribute on the pseudo-element's originating
    element.
 
-  <p>In CSS2.1 <a href="#CSS21" rel=biblioentry>[CSS21]<!--{{!CSS21}}--></a>,
-   the &lsquo;<a href="#attr"><code class=css>attr()</code></a>&rsquo;
-   expression always returns a string. In CSS3, the &lsquo;<a
-   href="#attr"><code class=css>attr()</code></a>&rsquo; expression can
-   return many different types. The &lsquo;<a href="#attr"><code
-   class=css>attr()</code></a>&rsquo; expression cannot return everything,
-   for example it cannot do counters, named strings, quotes, or keyword
-   values such as &lsquo;<code class=css>auto</code>&rsquo;, &lsquo;<code
-   class=css>nowrap</code>&rsquo;, or &lsquo;<code
-   class=css>baseline</code>&rsquo;. This is intentional, as the intent of
-   the &lsquo;<a href="#attr"><code class=css>attr()</code></a>&rsquo;
-   expression is not to make it possible to describe a presentational
-   language's formatting using CSS, but to enable CSS to take semantic data
-   into account.
+  <p class=note>In CSS2.1 <a href="#CSS21"
+   rel=biblioentry>[CSS21]<!--{{!CSS21}}--></a>, the &lsquo;<a
+   href="#attr"><code class=css>attr()</code></a>&rsquo; expression always
+   returns a string. In CSS3, the &lsquo;<a href="#attr"><code
+   class=css>attr()</code></a>&rsquo; expression can return many different
+   types. The &lsquo;<a href="#attr"><code class=css>attr()</code></a>&rsquo;
+   expression cannot return everything, for example it cannot do counters,
+   named strings, quotes, or keyword values such as &lsquo;<code
+   class=css>auto</code>&rsquo;, &lsquo;<code class=css>nowrap</code>&rsquo;,
+   or &lsquo;<code class=css>baseline</code>&rsquo;. This is intentional, as
+   the intent of the &lsquo;<a href="#attr"><code
+   class=css>attr()</code></a>&rsquo; expression is not to make it possible
+   to describe a presentational language's formatting using CSS, but to
+   enable CSS to take semantic data into account.
 
   <p>The new syntax for the &lsquo;<a href="#attr"><code
    class=css>attr()</code></a>&rsquo; expression is:

css3-values/Overview.src.html

@@ -1125,7 +1125,7 @@ <h3 id="attr-notation">
 		It returns the value of an attribute on the element.
 		If used on a pseudo-element, it returns the value of the attribute on the pseudo-element's originating element.
 
-	<p>In CSS2.1 [[!CSS21]], the ''attr()''	expression always returns a	string. 
+	<p class='note'>In CSS2.1 [[!CSS21]], the ''attr()'' expression always returns a string. 
 	In CSS3, the ''attr()'' expression can return many different types. The 
 	''attr()'' expression cannot return everything, for example it cannot
 	do counters, named strings, quotes, or keyword values such as ''auto'',