Turn the 'default object size' list back to normative, add note about it not meaning to contradict anything.

Author: tabatkins

css3-images/Overview.html

@@ -702,8 +702,17 @@ <h3 id=element-reference><span class=secno>3.3. </span> Using Elements as
    element changes appearance, the image changes as well. This can be used,
    for example, to create live previews of the next/previous slide in a
    slideshow, or to reference a canvas element for a fancy generated gradient
-   or even an animated background. The syntax for &lsquo;<code
-   class=css>element()</code>&rsquo; is:
+   or even an animated background.
+
+  <p class=note>Note that the &lsquo;<code class=css>element()</code>&rsquo;
+   function only reproduces the <em>appearance</em> of the referenced
+   element, not the actual content and its structure. Authors should only use
+   this for decorative purposes, and must not use &lsquo;<code
+   class=css>element()</code>&rsquo; to reproduce an element with significant
+   content across the page. Instead, just insert multiple copies of the
+   element into the document.
+
+  <p>The syntax for &lsquo;<code class=css>element()</code>&rsquo; is:
 
   <pre class=prod><dfn
    id=element-reference-type>&lt;element-reference></dfn> = element( &lt;id-selector> )</pre>
@@ -1462,7 +1471,7 @@ <h4 class=no-toc id=degenerate-radials><span class=secno>4.2.3. </span>
 
   <dl>
    <dt>If the <a href="#ending-shape"><i>ending shape</i></a> is a circle
-    with zero width or height:
+    with zero radius:
 
    <dd>Render as if the <a href="#ending-shape"><i>ending shape</i></a> was a
     circle whose radius was an arbitrary very small number greater than zero.
@@ -1864,14 +1873,16 @@ <h3 id=sizing-terms><span class=secno>5.1. </span> Object-Sizing
      dimensions. It varies based on the context in which that the image is
      being laid out.</p>
 
-    <p>The following informative list summarizes the <a
+    <p>The following list defines the <a
      href="#default-object-size"><i>default object size</i></a> of properties
      and contexts that appear in CSS 2.1, plus &lsquo;<code
      class=property>border-image</code>&rsquo; from CSS 3 Backgrounds &amp;
      Borders. Newer modules that accept an &lsquo;<a href="#image-type"><code
      class=css>&lt;image></code></a>&rsquo; component value in a new context
      must define the <a href="#default-object-size"><i>default object
-     size</i></a> in that context.</p>
+     size</i></a> in that context. This list is normative, but it is not
+     intended to contradict anything stated in CSS2.1 or CSS3 Backgrounds
+     &amp; Borders.</p>
 
     <dl>
      <dt>&lsquo;<code class=property>background-image</code>&rsquo;

css3-images/Overview.src.html

@@ -319,7 +319,11 @@ <h4 id='bidi-images'>
 <h3 id='element-reference'>
 Using Elements as Images: the ''element()'' notation</h3>
 
-	<p>The ''element()'' function allows an author to use an element in the document as an image.  As the referenced element changes appearance, the image changes as well.  This can be used, for example, to create live previews of the next/previous slide in a slideshow, or to reference a canvas element for a fancy generated gradient or even an animated background.  The syntax for ''element()'' is:</p>
+	<p>The ''element()'' function allows an author to use an element in the document as an image.  As the referenced element changes appearance, the image changes as well.  This can be used, for example, to create live previews of the next/previous slide in a slideshow, or to reference a canvas element for a fancy generated gradient or even an animated background.</p>
+
+	<p class='note'>Note that the ''element()'' function only reproduces the <em>appearance</em> of the referenced element, not the actual content and its structure.  Authors should only use this for decorative purposes, and must not use ''element()'' to reproduce an element with significant content across the page.  Instead, just insert multiple copies of the element into the document.</p>
+
+	<p>The syntax for ''element()'' is:</p>
 
 	<pre class=prod><dfn id='element-reference-type'>&lt;element-reference></dfn> = element( &lt;id-selector> )</pre>
 
@@ -818,7 +822,7 @@ <h4 class="no-toc" id="degenerate-radials">
 	be rendered as follows:</p>
 
 	<dl>
-		<dt>If the <i>ending shape</i> is a circle with zero width or height:</dt>
+		<dt>If the <i>ending shape</i> is a circle with zero radius:</dt>
 		<dd>Render as if the <i>ending shape</i> was a circle whose radius was an arbitrary very small number greater than zero.  <span class='note'>This will make the gradient continue to look like a circle.</span></dd>
 
 		<dt>If the <i>ending shape</i> has zero width (regardless of the height):</dt>
@@ -1099,11 +1103,7 @@ <h3 id="sizing-terms">
 			<i>intrinsic dimensions</i> and <i>specified size</i> are missing dimensions.  
 			It varies based on the context in which that the image is being laid out.</p>
 
-			<p>The following informative list summarizes the <i>default object size</i> of
-			properties and contexts that appear in CSS 2.1, plus 'border-image' from
-			CSS 3 Backgrounds &amp; Borders.
-			Newer modules that accept an ''&lt;image>'' component value in a new
-			context must define the <i>default object size</i> in that context.</p>
+			<p>The following list defines the <i>default object size</i> of properties and contexts that appear in CSS 2.1, plus 'border-image' from CSS 3 Backgrounds &amp; Borders. Newer modules that accept an ''&lt;image>'' component value in a new context must define the <i>default object size</i> in that context.  This list is normative, but it is not intended to contradict anything stated in CSS2.1 or CSS3 Backgrounds &amp; Borders.</p>
 
 			<dl>
 				<dt>'background-image'</dt>