Tweak wording around element() & SVG coordinate systems to fix a final niggle from Erik.

Author: tabatkins

css3-images/Overview.html

@@ -897,23 +897,24 @@ <h4 class=no-num id=paint-sources> Paint Sources</h4>
   <dl>
    <dt>objectBoundingBox
 
-   <dd>The coordinate system has its origin at the top left corner of the <a
-    href="#concrete-object-size"><i>concrete object size</i></a> it's being
-    drawn into, and the same width and height as the <a
-    href="#concrete-object-size"><i>concrete object size</i></a>. A single <a
+   <dd>The coordinate system has its origin at the top left corner of the
+    rectangle defined by the <a href="#concrete-object-size"><i>concrete
+    object size</i></a> that it's being drawn into, and the same width and
+    height as the <a href="#concrete-object-size"><i>concrete object
+    size</i></a>. A single <a
     href="http://www.w3.org/TR/SVG/coords.html#Units">user coordinate</a> is
     the width and height of the <a href="#concrete-object-size"><i>concrete
     object size</i></a>.
 
    <dt>userSpaceOnUse
 
-   <dd>The coordinate system has its origin at the top left corner of the <a
-    href="#concrete-object-size"><i>concrete object size</i></a> it's being
-    drawn into, and the same width and height as the <a
-    href="#concrete-object-size"><i>concrete object size</i></a>. <a
-    href="http://www.w3.org/TR/SVG/coords.html#Units">User coordinates</a>
-    are sized equivalently to the CSS &lsquo;<code class=css>px</code>&rsquo;
-    unit.
+   <dd>The coordinate system has its origin at the top left corner of the
+    rectangle defined by the <a href="#concrete-object-size"><i>concrete
+    object size</i></a> that it's being drawn into, and the same width and
+    height as the <a href="#concrete-object-size"><i>concrete object
+    size</i></a>. <a href="http://www.w3.org/TR/SVG/coords.html#Units">User
+    coordinates</a> are sized equivalently to the CSS &lsquo;<code
+    class=css>px</code>&rsquo; unit.
   </dl>
 
   <div class=note>

css3-images/Overview.src.html

@@ -467,10 +467,10 @@ <h4 id='paint-sources' class='no-num'>
 
 	<dl>
 		<dt>objectBoundingBox</dt>
-		<dd>The coordinate system has its origin at the top left corner of the <i>concrete object size</i> it's being drawn into, and the same width and height as the <i>concrete object size</i>.  A single <a href="http://www.w3.org/TR/SVG/coords.html#Units">user coordinate</a> is the width and height of the <i>concrete object size</i>.</dd>
+		<dd>The coordinate system has its origin at the top left corner of the rectangle defined by the <i>concrete object size</i> that it's being drawn into, and the same width and height as the <i>concrete object size</i>.  A single <a href="http://www.w3.org/TR/SVG/coords.html#Units">user coordinate</a> is the width and height of the <i>concrete object size</i>.</dd>
 
 		<dt>userSpaceOnUse</dt>
-		<dd>The coordinate system has its origin at the top left corner of the <i>concrete object size</i> it's being drawn into, and the same width and height as the <i>concrete object size</i>.  <a href="http://www.w3.org/TR/SVG/coords.html#Units">User coordinates</a> are sized equivalently to the CSS ''px'' unit.</dd>
+		<dd>The coordinate system has its origin at the top left corner of the rectangle defined by the <i>concrete object size</i> that it's being drawn into, and the same width and height as the <i>concrete object size</i>.  <a href="http://www.w3.org/TR/SVG/coords.html#Units">User coordinates</a> are sized equivalently to the CSS ''px'' unit.</dd>
 	</dl>
 
 	<div class='note'>