Add comment about SVGGraphicsElement.{nearest,farthest}ViewportElement

third_party/WebKit/Source/core/svg/SVGGraphicsElement.idl

 /*
  * Copyright (C) 2013 Samsung Electronics. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 15 matching lines @@
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 // https://svgwg.org/svg2-draft/types.html#InterfaceSVGGraphicsElement
 
 interface SVGGraphicsElement : SVGElement {
     [Measure] readonly attribute SVGAnimatedTransformList transform;
 
-    [MeasureAs=SVGLocatableNearestViewportElement] readonly attribute SVGElement nearestViewportElement;
-    [MeasureAs=SVGLocatableFarthestViewportElement] readonly attribute SVGElement farthestViewportElement;
-
     [ImplementedAs=getBBoxFromJavascript] SVGRect getBBox();
     [ImplementedAs=getCTMFromJavascript] SVGMatrix getCTM();
     [ImplementedAs=getScreenCTMFromJavascript] SVGMatrix getScreenCTM();
+
+    // The following two properties existed on SVGLocatable in SVG
+    // 1.1, but was removed in SVG2.
+    // https://www.w3.org/TR/SVG11/types.html#InterfaceSVGLocatable
+    [MeasureAs=SVGLocatableNearestViewportElement] readonly attribute SVGElement nearestViewportElement;
+    [MeasureAs=SVGLocatableFarthestViewportElement] readonly attribute SVGElement farthestViewportElement;
 };
 
 SVGGraphicsElement implements SVGTests;