Add comment about SVGGraphicsElement.{nearest,farthest}ViewportElement

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

Index: third_party/WebKit/Source/core/svg/SVGGraphicsElement.idl
diff --git a/third_party/WebKit/Source/core/svg/SVGGraphicsElement.idl b/third_party/WebKit/Source/core/svg/SVGGraphicsElement.idl
index 773aa51ef67d2129413055bca4e80a24e6b7527c..508de310653a02255f597b5eb5a7623486766096 100644
--- a/third_party/WebKit/Source/core/svg/SVGGraphicsElement.idl
+++ b/third_party/WebKit/Source/core/svg/SVGGraphicsElement.idl
@@ -33,12 +33,15 @@
 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;