[at] (1) Define what the various coordinates actually _are_.

git-svn-id: http://svn.whatwg.org/webapps@584 340c8d12-0b0e-0410-8428-c7bf67bfef74

index

@@ -13708,7 +13708,12 @@ interface <dfn id=imagedata>ImageData</dfn> {
   <p>In the <a href="#circle" title=attr-area-shape-circle>circle state</a>,
    <code><a href="#area0">area</a></code> elements must have a <code
    title=attr-area-coords><a href="#coords">coords</a></code> attribute
-   present, with three integers, the last of which must be non-negative.
+   present, with three integers, the last of which must be non-negative. The
+   first integer must be the distance in CSS pixels from the left edge of the
+   image to the center of the circle, the second integer must be the distance
+   in CSS pixels from the top edge of the image to the center of the circle,
+   and the third integer must be the radius of the circle, again in CSS
+   pixels.
 
   <p>In the <a href="#default" title=attr-area-shape-default>default
    state</a> state, <code><a href="#area0">area</a></code> elements must not
@@ -13718,13 +13723,20 @@ interface <dfn id=imagedata>ImageData</dfn> {
   <p>In the <a href="#polygon" title=attr-area-shape-poly>polygon state</a>,
    <code><a href="#area0">area</a></code> elements must have a <code
    title=attr-area-coords><a href="#coords">coords</a></code> attribute with
-   at least six integers, and the number of integers must be even.
+   at least six integers, and the number of integers must be even. Each pair
+   of integers must represent a coordinate given as the distances from the
+   left and the top of the image in CSS pixels respectively, and all the
+   coordinates together must represent the points of the polygon, in order.
 
   <p>In the <a href="#rectangle" title=attr-area-shape-rect>rectangle
    state</a>, <code><a href="#area0">area</a></code> elements must have a
    <code title=attr-area-coords><a href="#coords">coords</a></code> attribute
    with exactly four integers, the first of which must be less than the
-   third, and the second of which must be less than the fourth.
+   third, and the second of which must be less than the fourth. The four
+   points must represent, respectively, the distance from the left edge of
+   the image to the top left side of the rectangle, the distance from the top
+   edge to the top side, the distance from the left edge to the right side,
+   and the distance from the top edge to the bottom side, all in CSS pixels.
 
   <p>When user agents allow users to <a href="#following1" title="following
    hyperlinks">follow hyperlinks</a> created using the <code><a

source

@@ -11724,7 +11724,12 @@ interface <dfn>ImageData</dfn> {
   <p>In the <span title="attr-area-shape-circle">circle state</span>,
   <code>area</code> elements must have a <code
   title="attr-area-coords">coords</code> attribute present, with three
-  integers, the last of which must be non-negative.</p>
+  integers, the last of which must be non-negative. The first integer
+  must be the distance in CSS pixels from the left edge of the image
+  to the center of the circle, the second integer must be the distance
+  in CSS pixels from the top edge of the image to the center of the
+  circle, and the third integer must be the radius of the circle,
+  again in CSS pixels.</p>
 
   <p>In the <span title="attr-area-shape-default">default state</span>
   state, <code>area</code> elements must not have a <code
@@ -11733,13 +11738,22 @@ interface <dfn>ImageData</dfn> {
   <p>In the <span title="attr-area-shape-poly">polygon state</span>,
   <code>area</code> elements must have a <code
   title="attr-area-coords">coords</code> attribute with at least six
-  integers, and the number of integers must be even.</p>
+  integers, and the number of integers must be even. Each pair of
+  integers must represent a coordinate given as the distances from the
+  left and the top of the image in CSS pixels respectively, and all
+  the coordinates together must represent the points of the polygon,
+  in order.</p>
 
   <p>In the <span title="attr-area-shape-rect">rectangle state</span>,
   <code>area</code> elements must have a <code
   title="attr-area-coords">coords</code> attribute with exactly four
   integers, the first of which must be less than the third, and the
-  second of which must be less than the fourth.</p>
+  second of which must be less than the fourth. The four points must
+  represent, respectively, the distance from the left edge of the
+  image to the top left side of the rectangle, the distance from the
+  top edge to the top side, the distance from the left edge to the
+  right side, and the distance from the top edge to the bottom side,
+  all in CSS pixels.</p>
 
   <p>When user agents allow users to <span title="following
   hyperlinks">follow hyperlinks</span> created using the