More clarificaton of box-shadow spread

Author: fantasai

css3-background/Overview.html

@@ -3738,17 +3738,17 @@ <h3 id=the-box-shadow><span class=secno>6.2. </span>The &lsquo;<a
    class=property>border-image</code></a>&rsquo; does not affect the shape of
    the box-shadow.
 
-  <p>If a spread radius is defined, it increases the size of the shadow in
-   the direction normal to the shadow's edge by the specified amount.
-   However, for corners with a zero border-radius, the corner remains sharp,
-   i.e. the operation is equivalent to scaling the border-box. The UA may
-   approximate the transformed shadow perimeter shape by outsetting
-   (insetting, for inner shadows) the shadow's straight edges by the spread
-   radius and increasing (decreasing, for inner shadows) and flooring at zero
-   the corner radii by the same amount. In either case, the effective width
-   and height of the shadow shape is floored at zero. (A zero-sized shadow
-   shape would cause an outer shadow to disappear, and an inner shadow to
-   cover the entire padding-box.)
+  <p>If a spread radius is defined, the shadow is expanded by an outward
+   outset of the specified amount normal to the original shadow perimeter.
+   For corners with a zero border-radius (i.e. where the normal is not
+   defined), the corner remains sharp&#8212;the operation is equivalent to
+   scaling the shadow shape. The UA may approximate the transformed shadow
+   perimeter shape by outsetting (insetting, for inner shadows) the shadow's
+   straight edges by the spread radius and increasing (decreasing, for inner
+   shadows) and flooring at zero the corner radii by the same amount. In
+   either case, the effective width and height of the shadow shape is floored
+   at zero. (A zero-sized shadow shape would cause an outer shadow to
+   disappear, and an inner shadow to cover the entire padding-box.)
 
   <p>The blur radius is perpendicular to and centered on the shadow's edge
    and defines a gradient color transition ranging from the full shadow color

css3-background/Overview.src.html

@@ -2714,10 +2714,11 @@ <h3 id="the-box-shadow">The 'box-shadow' property</h3>
 the shadow shape is rounded in the same way. The 'border-image' does not
 affect the shape of the box-shadow.
 
-<p>If a spread radius is defined, it increases the size of the shadow
-in the direction normal to the shadow's edge by the specified amount.
-However, for corners with a zero border-radius, the corner remains
-sharp, i.e. the operation is equivalent to scaling the border-box.
+<p>If a spread radius is defined, the shadow is expanded by an outward
+outset of the specified amount normal to the original shadow perimeter.
+For corners with a zero border-radius (i.e. where the normal is not
+defined), the corner remains sharp&#8212;the operation is equivalent to
+scaling the shadow shape.
 The UA may approximate the transformed shadow perimeter shape by
 outsetting (insetting, for inner shadows) the shadow's straight edges
 by the spread radius and increasing (decreasing, for inner shadows)