[css-round-display] Polar minor update

Author: anawhj

css-round-display/Overview.bs

@@ -282,29 +282,32 @@ Note: In the polar coordinate system, a point is described as being a certain di
 When the 'position' property on an element is set to '<code>polar</code>', the element could be affected in polar coordinate system.
 <pre class='propdef'>
     Name: position
-    Applies to: all elements
-    Value: static | relative | absolute | fixed | inherit | <code>polar</code>
+    Applies to: all elements except table-column-group and table-column
+    Value: static | relative | absolute | sticky | fixed | <code>polar</code>
     Initial: static
     Inherited: no
+	Percentages: N/A
     Media: visual
+	Computed value: specified value
+	Animatable: no
 </pre>
 <h3 id="polar-angle-property">The 'polar-angle' property</h3>
 The 'polar-angle' property specifies the angle from the X-axis (or a fixed direction). This property is activated on condition of position: polar.
 <pre class='propdef'>
     Name: polar-angle
-    Applies to: all elements (parents should have 'position: polar' property)
+    Applies to: all elements
     Value: <<angle>>
     Initial: 0
     Media: visual
     Inherited: no
-    Percentages: n/a
+    Percentages: N/A
 	Animatable: as <a href="http://www.w3.org/TR/css3-transitions/#animatable-types">angle</a>
 </pre>
 <h3 id="polar-distance-property">The 'polar-distance' property</h3>
 The 'polar-distance' property specifies the distance from the center of the parent (or a fixed point). This property is activated on condition of position: polar.
 <pre class='propdef'>
     Name: polar-distance
-    Applies to: all elements (parents should have 'position: polar' property)
+    Applies to: all elements
     Value: [ <<length>> | <<percentage>> ]
     Initial: 0
     Media: visual
@@ -316,6 +319,7 @@ The 'polar-distance' property specifies the distance from the center of the pare
 <div class='example'>
 This example shows a way to align elements within the polar coordinates system.
 <pre>&lt;body>
+
   &lt;div id="circle1" style="position: polar; polar-angle: 0deg; polar-distance: 50%">&lt;/div>
   &lt;div id="circle2" style="position: polar; polar-angle: 90deg; polar-distance: 20%">&lt;/div>
   &lt;div id="circle3" style="position: polar; polar-angle: 225deg; polar-distance: 100%">&lt;/div>
@@ -329,7 +333,7 @@ This example shows a way to align elements within the polar coordinates system.
 </div>
 
 <p class="issue">
-By default, the 'polar-distance' property specifies the distance from the origin (or the center) of the containing element to that of the contained element. The 'polar-angle' property specifies the angle from the X-axis to the center of the contained element.
+By default, the 'polar-distance' property specifies the distance from the origin (or the center) of the containing element to that of the contained element. It needs to specify how can the origin of the containing element set.
 </p>
 <p class="issue">
 What value does the percentage value of the 'polar-distance' property refer to? The width of the containing element, or what? One feasible solution is to use the distance between the origin and the point on the border at the angle given by the 'polar-angle' property from the X-axis.