Fixed default value of implicit size/shape arg for radial gradients.

Author: tabatkins

css3-images/Overview.html

@@ -900,15 +900,19 @@ <h4 class=no-toc id=radial-gradient-syntax><span class=secno>5.2.1. </span>
      ending-ellipse will be a circle with a constant radius. &lsquo;<code
      class=css>ellipse</code>&rsquo; indicates that the gradient-shape will
      be an axis-aligned ellipse (that is, its major and minor radiuses will
-     be horizontal and vertical, not necessarily in that order).</p>
+     be horizontal and vertical, not necessarily in that order). If the <a
+     href="#ltshape"><i>&lt;shape></i></a> is omitted, it defaults to
+     &lsquo;<code class=css>ellipse</code>&rsquo;.</p>
 
     <p>The <a href="#ltsize"><i>&lt;size></i></a> keyword is defined as:</p>
 
     <pre><code><dfn id=ltsize>&lt;size></dfn> = closest-side | closest-corner | farthest-side | farthest-corner | contain | cover</code></pre>
 
     <p>Its values are defined in the list below. For the purpose of these
      definitions, consider the box edges as extending infinitely in both
-     directions, rather than being finite line segments.</p>
+     directions, rather than being finite line segments. If the <a
+     href="#ltsize"><i>&lt;size></i></a> is omitted, it defaults to &lsquo;<a
+     href="#radial-cover"><code class=css>cover</code></a>&rsquo;.</p>
 
     <dl>
      <dt><dfn id=radial-closest-side>closest-side</dfn>

css3-images/Overview.src.html

@@ -571,16 +571,13 @@ <h4 class='no-toc' id='radial-gradient-syntax'>
 
 			<pre><code><dfn>&lt;shape></dfn> = circle | ellipse</code></pre>
 
-			<p>''circle'' indicates that the ending-ellipse will be a circle with 
-			a constant radius.  ''ellipse'' indicates that the gradient-shape 
-			will be an axis-aligned ellipse (that is, its major and minor radiuses 
-			will be horizontal and vertical, not necessarily in that order).</p>
+			<p>''circle'' indicates that the ending-ellipse will be a circle with a constant radius.  ''ellipse'' indicates that the gradient-shape will be an axis-aligned ellipse (that is, its major and minor radiuses will be horizontal and vertical, not necessarily in that order).  If the <i>&lt;shape></i> is omitted, it defaults to ''ellipse''.</p>
 
 			<p>The <i>&lt;size></i> keyword is defined as:</p>
 
 			<pre><code><dfn>&lt;size></dfn> = closest-side | closest-corner | farthest-side | farthest-corner | contain | cover</code></pre>
 
-			<p>Its values are defined in the list below.  For the purpose of these definitions, consider the box edges as extending infinitely in both directions, rather than being finite line segments.</p>
+			<p>Its values are defined in the list below.  For the purpose of these definitions, consider the box edges as extending infinitely in both directions, rather than being finite line segments.  If the <i>&lt;size></i> is omitted, it defaults to ''cover''.</p>
 
 			<dl>
 				<dt><dfn id='radial-closest-side'>closest-side</dfn></dt>