Add clarification that image-resolution applies to both content and CSS images.

Author: tabatkins

css3-images/Overview.html

@@ -2181,7 +2181,9 @@ <h3 id=image-resolution><span class=secno>6.1. </span> Overriding Image
    class=property>image-resolution</code></a>&rsquo; property specifies the
    intrinsic resolution of all raster images used in or on the element. (As
    vector formats such as SVG do not have an intrinsic resolution, this
-   property has no effect on vector images.) The <dfn
+   property has no effect on vector images.) This affects both content images
+   (such as in the &lt;img> element) and CSS-supplied images such as in
+   &lsquo;<code class=property>background-image</code>&rsquo;. The <dfn
    id=intrinsic-resolution>intrinsic resolution</dfn> of an image is used to
    determine the image's <i>intrinsic size</i>. Affected images include
    images in the element's content (e.g. replaced elements and/or generated

css3-images/Overview.src.html

@@ -1409,14 +1409,7 @@ <h3 id="image-resolution">
 				by computing for ''snap'' (see below)
 	</table>
 
-	<p>The 'image-resolution' property specifies the intrinsic resolution of all
-	raster images used in or on the element. (As vector formats such as SVG do
-	not have an intrinsic resolution, this property has no effect on vector
-	images.) The <dfn>intrinsic resolution</dfn> of an image is used to determine
-	the image's <i>intrinsic size</i>. Affected images include images in the
-	element's content (e.g. replaced elements and/or generated content),
-	background images, list markers, etc.
-	Values have the following meanings:</p>
+	<p>The 'image-resolution' property specifies the intrinsic resolution of all raster images used in or on the element. (As vector formats such as SVG do not have an intrinsic resolution, this property has no effect on vector images.)  This affects both content images (such as in the &lt;img> element) and CSS-supplied images such as in 'background-image'.  The <dfn>intrinsic resolution</dfn> of an image is used to determine the image's <i>intrinsic size</i>. Affected images include images in the element's content (e.g. replaced elements and/or generated content), background images, list markers, etc. Values have the following meanings:</p>
 
 	<dl>
 		<dt>''&lt;resolution>''</dt>