[css-round-display] Modify the definition of polar-angle value

Author: Jihye Hong

css-round-display/Overview.bs

@@ -647,8 +647,7 @@ Values have the following meanings:
 <dl>
 <dt><var>polar-angle</var></dt>
 <dd>
-Rotate an element by the value of 'polar-angle' property. Therefore, when the anchor point of an element is center point of the
-element and there is a perpendicular line which passes through the anchor point, the line meets the origin of the containing block.
+Rotate an element by the value of 'polar-angle' property.
 </dd>
 </dl>
 <dl>
@@ -713,7 +712,7 @@ This example shows how the keyword value works in the 2d rotation function.
 	<img alt="An image of extended 2d rotate function" src="images/2d_rotate_function.png" style="width: 250px; text-align: center"/>
 	<p class="caption">An example of the extension for 2d rotate function</p>
 </div>
+</div>
 <div class='issue'>
 If this function is used inside an animation, which event is expected to occur?
-</div>
 </div>

css-round-display/Overview.html

@@ -780,16 +780,15 @@ <h3 class="heading settled" data-level="6.6" id="2d-rotation-transform-function"
      Values have the following meanings: 
     <dl>
      <dt><var>polar-angle</var>
-     <dd> Rotate an element by the value of <a class="property" data-link-type="propdesc" href="#propdef-polar-angle">polar-angle</a> property. Therefore, when the anchor point of an element is center point of the
-element and there is a perpendicular line which passes through the anchor point, the line meets the origin of the containing block. 
+     <dd> Rotate an element by the value of <a class="property" data-link-type="propdesc" href="#propdef-polar-angle">polar-angle</a> property. 
     </dl>
     <dl>
      <dt><var>reverse-polar-angle</var>
      <dd> Rotate an element by the angle of the <a class="property" data-link-type="propdesc" href="#propdef-polar-angle">polar-angle</a> property plus 180 degrees. 
     </dl>
     <p></p>
-    <div class="example" id="example-761302c9">
-     <a class="self-link" href="#example-761302c9"></a> This example shows how the keyword value works in the 2d rotation function. 
+    <div class="example" id="example-da758b7d">
+     <a class="self-link" href="#example-da758b7d"></a> This example shows how the keyword value works in the 2d rotation function. 
 <pre>&lt;style>
   #item1 {
     position: polar;
@@ -841,8 +840,8 @@ <h3 class="heading settled" data-level="6.6" id="2d-rotation-transform-function"
        <img alt="An image of extended 2d rotate function" src="images/2d_rotate_function.png" style="width: 250px; text-align: center"> 
       <p class="caption">An example of the extension for 2d rotate function</p>
      </div>
-     <div class="issue" id="issue-1e8cf7cf"><a class="self-link" href="#issue-1e8cf7cf"></a> If this function is used inside an animation, which event is expected to occur? </div>
     </div>
+    <div class="issue" id="issue-1e8cf7cf"><a class="self-link" href="#issue-1e8cf7cf"></a> If this function is used inside an animation, which event is expected to occur? </div>
    </section>
   </main>
   <h2 class="no-ref no-num heading settled" id="conformance"><span class="content"> Conformance</span><a class="self-link" href="#conformance"></a></h2>