Explore the possibility of implementing the CSS Region interface.

Source/core/dom/Element.idl

Index: Source/core/dom/Element.idl
diff --git a/Source/core/dom/Element.idl b/Source/core/dom/Element.idl
index 8d45e7d091190b9db985bb3e510830088782610f..67c3efedaf0fb85cb006d99dcc6fb84bb1f1ea40 100644
--- a/Source/core/dom/Element.idl
+++ b/Source/core/dom/Element.idl
@@ -129,10 +129,6 @@
 
     void webkitRequestPointerLock();
 
-    // CSS Regions API
-    [RuntimeEnabled=CSSRegions, PerWorldBindings] readonly attribute DOMString webkitRegionOverset;
-    [RuntimeEnabled=CSSRegions] sequence<Range> webkitGetRegionFlowRanges();
-
     // Event handler attributes
     attribute EventHandler onbeforecopy;
     attribute EventHandler onbeforecut;
@@ -153,3 +149,4 @@
 
 Element implements ParentNode;
 Element implements ChildNode;
+Element implements CSSRegion;