[cssom-view] Add MouseEvent to anchors data.

Author: tabatkins

cssom-view/Overview.bs

@@ -72,6 +72,7 @@ urlPrefix: http://heycam.github.io/webidl/
 		text: double
 		text: long
 	type: dfn; text: converted to an IDL value; url: dfn-convert-ecmascript-to-idl-value
+url: http://www.w3.org/TR/DOM-Level-3-Events/#interface-MouseEvent; type: interface; text: MouseEvent
 </pre>
 
 <pre class='link-defaults'>
@@ -1403,7 +1404,7 @@ Geometry {#geometry}
 enum CSSBoxType { "margin", "border", "padding", "content" };
 dictionary BoxQuadOptions {
   CSSBoxType box = "border";
-  GeometryNode relativeTo; // XXX default document (i.e. viewport) 
+  GeometryNode relativeTo; // XXX default document (i.e. viewport)
 };
 
 dictionary ConvertCoordinateOptions {
@@ -1416,10 +1417,10 @@ interface GeometryUtils {
   sequence&lt;DOMQuad> getBoxQuads(optional BoxQuadOptions options);
   DOMQuad convertQuadFromNode(DOMQuad quad, GeometryNode from, optional ConvertCoordinateOptions options);
   DOMQuad convertRectFromNode(DOMRectReadOnly rect, GeometryNode from, optional ConvertCoordinateOptions options);
-  DOMPoint convertPointFromNode(DOMPointInit point, GeometryNode from, optional ConvertCoordinateOptions options); // XXX z,w turns into 0 
+  DOMPoint convertPointFromNode(DOMPointInit point, GeometryNode from, optional ConvertCoordinateOptions options); // XXX z,w turns into 0
 };
 
-Text implements GeometryUtils; // like Range 
+Text implements GeometryUtils; // like Range
 Element implements GeometryUtils;
 PseudoElement implements GeometryUtils;
 Document implements GeometryUtils;
@@ -1431,21 +1432,21 @@ The <dfn method for=GeometryUtils lt="getBoxQuads(options)|getBoxQuads()">getBox
 
 <ol>
  <li class=issue>
-  DOM order 
- 
-  p1 = top left even in RTL 
+  DOM order
 
-  scale to 0 means divide by zero, return 0x0 
+  p1 = top left even in RTL
 
-  cross-frames not allowed, throw WrongDocumentError? 
+  scale to 0 means divide by zero, return 0x0
 
-  points are flatterned (3d transform), z=0. like getClientRect 
+  cross-frames not allowed, throw WrongDocumentError?
 
-  test block in inline 
+  points are flatterned (3d transform), z=0. like getClientRect
 
-  pseudo-elements before/after are children of the element 
+  test block in inline
 
-  viewport boxes are all the same 
+  pseudo-elements before/after are children of the element
+
+  viewport boxes are all the same
 </ol>
 
 The <dfn method for=GeometryUtils lt="convertQuadFromNode(quad, from, options)|convertQuadFromNode(quad, from)">convertQuadFromNode(<var>quad</var>, <var>from</var>, <var>options</var>)</dfn> method