--- a/test/touchevents/single-touch.html	Sun Apr 24 21:27:04 2011 -0700
+++ b/test/touchevents/single-touch.html	Sun Apr 24 21:28:56 2011 -0700
@@ -20,12 +20,16 @@
           assert_equals(ev.touches.length, 1, "One touch point.");
           assert_equals(ev.changedTouches.length, 1, "One changed touch point.");
           assert_equals(ev.targetTouches.length, 1, "One target touch point.");
+        }, "TouchList lengths are correct.");
 
+        test(function() {
           var t = ev.touches[0];
           assert_true(t.rotationAngle >= 0, "rotationAngle must be >= 0.");
           assert_true(t.rotationAngle < 90, "rotationAngle must be > 90.");
 
-        }, "touchstart event attributes are correct");
+          assert_true(t.radiusX > 0, "radiusX is positive.");
+          assert_true(t.radiusY > 0, "radiusY is positive.");
+        }, "TouchPoint area attributes are correct");
 
         done();
       });

--- a/touchevents.html	Sun Apr 24 21:27:04 2011 -0700
+++ b/touchevents.html	Sun Apr 24 21:28:56 2011 -0700
@@ -156,12 +156,12 @@
 
         <dt>readonly attribute long radiusX</dt>
         <dd>
-          the radius of the ellipse which most closely circumscribes the touching area (e.g. finger, stylus) along the x-axis, in pixels of the same scale as <a>screenX</a>; <code>1</code> if no value is known.
+          the radius of the ellipse which most closely circumscribes the touching area (e.g. finger, stylus) along the x-axis, in pixels of the same scale as <a>screenX</a>; <code>1</code> if no value is known.  The value must be positive.
           <p class="issue" id="issue-units"><strong>Issue:</strong> What are units of radiusX/radiusY?  CSS Pixels?</p>
         </dd>
         <dt>readonly attribute long radiusY</dt>
         <dd>
-          the radius of the ellipse which most closely circumscribes the touching area (e.g. finger, stylus) along the y-axis, in pixels of the same scale as <a>screenY</a>; <code>1</code> if no value is known.
+          the radius of the ellipse which most closely circumscribes the touching area (e.g. finger, stylus) along the y-axis, in pixels of the same scale as <a>screenY</a>; <code>1</code> if no value is known.  The value must be positive.
         </dd>
 
         <dt>readonly attribute float rotationAngle</dt>