diff --git a/gwt-dom-gwt2-tests/src/test/java/org/gwtproject/dom/client/NodeTest.java b/gwt-dom-gwt2-tests/src/test/java/org/gwtproject/dom/client/NodeTest.java
index 52f6e76..4b1f378 100644
--- a/gwt-dom-gwt2-tests/src/test/java/org/gwtproject/dom/client/NodeTest.java
+++ b/gwt-dom-gwt2-tests/src/test/java/org/gwtproject/dom/client/NodeTest.java
@@ -19,7 +19,6 @@
 import com.google.gwt.junit.Platform;
 import com.google.gwt.junit.client.GWTTestCase;
 import java.util.Locale;
-import org.gwtproject.core.client.JavaScriptObject;
 
 /** Tests the {@link Node} class. */
 public class NodeTest extends GWTTestCase {
@@ -296,7 +295,7 @@ public void testParentAndSiblings() {
   public void testIsAndAs() {
     assertTrue(Node.is(Document.get()));
 
-    JavaScriptObject text = Document.get().createTextNode("foo");
+    Object text = Document.get().createTextNode("foo");
     assertTrue(Node.is(text));
 
     // Node.is(null) is allowed and should return false.
diff --git a/gwt-dom-j2cl-tests/src/test/java/org/gwtproject/dom/client/NodeTest.java b/gwt-dom-j2cl-tests/src/test/java/org/gwtproject/dom/client/NodeTest.java
index 04a84ba..0354f19 100644
--- a/gwt-dom-j2cl-tests/src/test/java/org/gwtproject/dom/client/NodeTest.java
+++ b/gwt-dom-j2cl-tests/src/test/java/org/gwtproject/dom/client/NodeTest.java
@@ -18,7 +18,6 @@
 import static junit.framework.TestCase.*;
 
 import java.util.Locale;
-import org.gwtproject.core.client.JavaScriptObject;
 import org.junit.Test;
 
 /** Tests the {@link Node} class. */
@@ -280,7 +279,7 @@ public void testParentAndSiblings() {
   public void testIsAndAs() {
     assertTrue(Node.is(Document.get()));
 
-    JavaScriptObject text = Document.get().createTextNode("foo");
+    Object text = Document.get().createTextNode("foo");
     assertTrue(Node.is(text));
 
     // Node.is(null) is allowed and should return false.
diff --git a/gwt-dom/src/main/java/org/gwtproject/dom/client/AnchorElement.java b/gwt-dom/src/main/java/org/gwtproject/dom/client/AnchorElement.java
index ab5fe4c..2651337 100644
--- a/gwt-dom/src/main/java/org/gwtproject/dom/client/AnchorElement.java
+++ b/gwt-dom/src/main/java/org/gwtproject/dom/client/AnchorElement.java
@@ -19,7 +19,6 @@
 import jsinterop.annotations.JsPackage;
 import jsinterop.annotations.JsProperty;
 import jsinterop.annotations.JsType;
-import org.gwtproject.core.client.JavaScriptObject;
 import org.gwtproject.safehtml.shared.SafeUri;
 import org.gwtproject.safehtml.shared.annotations.IsSafeUri;
 
@@ -49,14 +48,14 @@ public static AnchorElement as(Element elem) {
   }
 
   /**
-   * Determines whether the given {@link JavaScriptObject} can be cast to this class. A <code>null
+   * Determines whether the given object can be cast to this class. A <code>null
    * </code> object will cause this method to return <code>false</code>.
    *
    * @param o the object to check if it is an instance of this type
    * @return true of the object is an instance of this type, false otherwise
    */
   @JsOverlay
-  public static boolean is(JavaScriptObject o) {
+  public static boolean is(Object o) {
     if (Element.is(o)) {
       return is((Element) o);
     }
diff --git a/gwt-dom/src/main/java/org/gwtproject/dom/client/AreaElement.java b/gwt-dom/src/main/java/org/gwtproject/dom/client/AreaElement.java
index 49861d8..e5f0e1a 100644
--- a/gwt-dom/src/main/java/org/gwtproject/dom/client/AreaElement.java
+++ b/gwt-dom/src/main/java/org/gwtproject/dom/client/AreaElement.java
@@ -19,7 +19,6 @@
 import jsinterop.annotations.JsPackage;
 import jsinterop.annotations.JsProperty;
 import jsinterop.annotations.JsType;
-import org.gwtproject.core.client.JavaScriptObject;
 
 /**
  * Client-side image map area definition.
@@ -47,14 +46,14 @@ public static AreaElement as(Element elem) {
   }
 
   /**
-   * Determines whether the given {@link JavaScriptObject} can be cast to this class. A <code>null
+   * Determines whether the given object can be cast to this class. A <code>null
    * </code> object will cause this method to return <code>false</code>.
    *
    * @param o the object to check if it is an instance of this type
    * @return true of the object is an instance of this type, false otherwise
    */
   @JsOverlay
-  public static boolean is(JavaScriptObject o) {
+  public static boolean is(Object o) {
     if (Element.is(o)) {
       return is((Element) o);
     }
diff --git a/gwt-dom/src/main/java/org/gwtproject/dom/client/BRElement.java b/gwt-dom/src/main/java/org/gwtproject/dom/client/BRElement.java
index d852314..eb39cab 100644
--- a/gwt-dom/src/main/java/org/gwtproject/dom/client/BRElement.java
+++ b/gwt-dom/src/main/java/org/gwtproject/dom/client/BRElement.java
@@ -18,7 +18,6 @@
 import jsinterop.annotations.JsOverlay;
 import jsinterop.annotations.JsPackage;
 import jsinterop.annotations.JsType;
-import org.gwtproject.core.client.JavaScriptObject;
 
 /**
  * Force a line break.
@@ -46,14 +45,14 @@ public static BRElement as(Element elem) {
   }
 
   /**
-   * Determines whether the given {@link JavaScriptObject} can be cast to this class. A <code>null
+   * Determines whether the given object can be cast to this class. A <code>null
    * </code> object will cause this method to return <code>false</code>.
    *
    * @param o the object to check if it is an instance of this type
    * @return true of the object is an instance of this type, false otherwise
    */
   @JsOverlay
-  public static boolean is(JavaScriptObject o) {
+  public static boolean is(Object o) {
     if (Element.is(o)) {
       return is((Element) o);
     }
diff --git a/gwt-dom/src/main/java/org/gwtproject/dom/client/BaseElement.java b/gwt-dom/src/main/java/org/gwtproject/dom/client/BaseElement.java
index 1609179..b6451b3 100644
--- a/gwt-dom/src/main/java/org/gwtproject/dom/client/BaseElement.java
+++ b/gwt-dom/src/main/java/org/gwtproject/dom/client/BaseElement.java
@@ -19,7 +19,6 @@
 import jsinterop.annotations.JsPackage;
 import jsinterop.annotations.JsProperty;
 import jsinterop.annotations.JsType;
-import org.gwtproject.core.client.JavaScriptObject;
 
 /**
  * Document base URI.
@@ -47,14 +46,14 @@ public static BaseElement as(Element elem) {
   }
 
   /**
-   * Determines whether the given {@link JavaScriptObject} can be cast to this class. A <code>null
+   * Determines whether the given object can be cast to this class. A <code>null
    * </code> object will cause this method to return <code>false</code>.
    *
    * @param o the object to check if it is an instance of this type
    * @return true of the object is an instance of this type, false otherwise
    */
   @JsOverlay
-  public static boolean is(JavaScriptObject o) {
+  public static boolean is(Object o) {
     if (Element.is(o)) {
       return is((Element) o);
     }
diff --git a/gwt-dom/src/main/java/org/gwtproject/dom/client/BodyElement.java b/gwt-dom/src/main/java/org/gwtproject/dom/client/BodyElement.java
index 103ab5f..2de5065 100644
--- a/gwt-dom/src/main/java/org/gwtproject/dom/client/BodyElement.java
+++ b/gwt-dom/src/main/java/org/gwtproject/dom/client/BodyElement.java
@@ -18,7 +18,6 @@
 import jsinterop.annotations.JsOverlay;
 import jsinterop.annotations.JsPackage;
 import jsinterop.annotations.JsType;
-import org.gwtproject.core.client.JavaScriptObject;
 
 /**
  * The HTML document body. This element is always present in the DOM API, even if the tags are not
@@ -47,14 +46,14 @@ public static BodyElement as(Element elem) {
   }
 
   /**
-   * Determines whether the given {@link JavaScriptObject} can be cast to this class. A <code>null
+   * Determines whether the given object can be cast to this class. A <code>null
    * </code> object will cause this method to return <code>false</code>.
    *
    * @param o the object to check if it is an instance of this type
    * @return true of the object is an instance of this type, false otherwise
    */
   @JsOverlay
-  public static boolean is(JavaScriptObject o) {
+  public static boolean is(Object o) {
     if (Element.is(o)) {
       return is((Element) o);
     }
diff --git a/gwt-dom/src/main/java/org/gwtproject/dom/client/ButtonElement.java b/gwt-dom/src/main/java/org/gwtproject/dom/client/ButtonElement.java
index 129f0d3..7e5ae7b 100644
--- a/gwt-dom/src/main/java/org/gwtproject/dom/client/ButtonElement.java
+++ b/gwt-dom/src/main/java/org/gwtproject/dom/client/ButtonElement.java
@@ -21,7 +21,6 @@
 import jsinterop.annotations.JsProperty;
 import jsinterop.annotations.JsType;
 import jsinterop.base.Js;
-import org.gwtproject.core.client.JavaScriptObject;
 
 /**
  * Push button.
@@ -49,14 +48,14 @@ public static ButtonElement as(Element elem) {
   }
 
   /**
-   * Determines whether the given {@link JavaScriptObject} can be cast to this class. A <code>null
+   * Determines whether the given object can be cast to this class. A <code>null
    * </code> object will cause this method to return <code>false</code>.
    *
    * @param o the object to check if it is an instance of this type
    * @return true of the object is an instance of this type, false otherwise
    */
   @JsOverlay
-  public static boolean is(JavaScriptObject o) {
+  public static boolean is(Object o) {
     if (Element.is(o)) {
       return is((Element) o);
     }
diff --git a/gwt-dom/src/main/java/org/gwtproject/dom/client/DListElement.java b/gwt-dom/src/main/java/org/gwtproject/dom/client/DListElement.java
index 9bd98bf..ee17ea5 100644
--- a/gwt-dom/src/main/java/org/gwtproject/dom/client/DListElement.java
+++ b/gwt-dom/src/main/java/org/gwtproject/dom/client/DListElement.java
@@ -18,7 +18,6 @@
 import jsinterop.annotations.JsOverlay;
 import jsinterop.annotations.JsPackage;
 import jsinterop.annotations.JsType;
-import org.gwtproject.core.client.JavaScriptObject;
 
 /**
  * Definition list.
@@ -46,14 +45,14 @@ public static DListElement as(Element elem) {
   }
 
   /**
-   * Determines whether the given {@link JavaScriptObject} can be cast to this class. A <code>null
+   * Determines whether the given object can be cast to this class. A <code>null
    * </code> object will cause this method to return <code>false</code>.
    *
    * @param o the object to check if it is an instance of this type
    * @return true of the object is an instance of this type, false otherwise
    */
   @JsOverlay
-  public static boolean is(JavaScriptObject o) {
+  public static boolean is(Object o) {
     if (Element.is(o)) {
       return is((Element) o);
     }
diff --git a/gwt-dom/src/main/java/org/gwtproject/dom/client/DivElement.java b/gwt-dom/src/main/java/org/gwtproject/dom/client/DivElement.java
index 2b757f6..51405c1 100644
--- a/gwt-dom/src/main/java/org/gwtproject/dom/client/DivElement.java
+++ b/gwt-dom/src/main/java/org/gwtproject/dom/client/DivElement.java
@@ -18,7 +18,6 @@
 import jsinterop.annotations.JsOverlay;
 import jsinterop.annotations.JsPackage;
 import jsinterop.annotations.JsType;
-import org.gwtproject.core.client.JavaScriptObject;
 
 /**
  * Generic block container.
@@ -46,14 +45,14 @@ public static DivElement as(Element elem) {
   }
 
   /**
-   * Determines whether the given {@link JavaScriptObject} can be cast to this class. A <code>null
+   * Determines whether the given can be cast to this class. A <code>null
    * </code> object will cause this method to return <code>false</code>.
    *
    * @param o the object to check if it is an instance of this type
    * @return true of the object is an instance of this type, false otherwise
    */
   @JsOverlay
-  public static boolean is(JavaScriptObject o) {
+  public static boolean is(Object o) {
     if (Element.is(o)) {
       return is((Element) o);
     }
diff --git a/gwt-dom/src/main/java/org/gwtproject/dom/client/Element.java b/gwt-dom/src/main/java/org/gwtproject/dom/client/Element.java
index 46cca36..80932be 100644
--- a/gwt-dom/src/main/java/org/gwtproject/dom/client/Element.java
+++ b/gwt-dom/src/main/java/org/gwtproject/dom/client/Element.java
@@ -83,14 +83,14 @@ public static Element as(Node node) {
   }
 
   /**
-   * Determines whether the given {@link JavaScriptObject} can be cast to an {@link Element}. A
+   * Determines whether the given object can be cast to an {@link Element}. A
    * <code>null</code> object will cause this method to return <code>false</code>.
    *
    * @param o the object to check if it is an instance of this type
    * @return true of the object is an instance of this type, false otherwise
    */
   @JsOverlay
-  public static boolean is(JavaScriptObject o) {
+  public static boolean is(Object o) {
     if (Node.is(o)) {
       return is((Node) o);
     }
diff --git a/gwt-dom/src/main/java/org/gwtproject/dom/client/EventTarget.java b/gwt-dom/src/main/java/org/gwtproject/dom/client/EventTarget.java
index 65c41ab..4c22886 100644
--- a/gwt-dom/src/main/java/org/gwtproject/dom/client/EventTarget.java
+++ b/gwt-dom/src/main/java/org/gwtproject/dom/client/EventTarget.java
@@ -23,7 +23,7 @@
  * Represents the target of a JavaScript event.
  *
  * <p>This type is returned from methods such as {@link NativeEvent#getEventTarget()}, and must
- * usually be cast to another type using methods such as {@link Element#is(JavaScriptObject)} and
+ * usually be cast to another type using methods such as {@link Element#is(Object)} and
  * {@link Element#as(JavaScriptObject)}.
  *
  * <p>This class intentionally does <em>not</em> specify the methods from the DOM IDL
diff --git a/gwt-dom/src/main/java/org/gwtproject/dom/client/FieldSetElement.java b/gwt-dom/src/main/java/org/gwtproject/dom/client/FieldSetElement.java
index bf3e1b3..1d4a581 100644
--- a/gwt-dom/src/main/java/org/gwtproject/dom/client/FieldSetElement.java
+++ b/gwt-dom/src/main/java/org/gwtproject/dom/client/FieldSetElement.java
@@ -19,7 +19,6 @@
 import jsinterop.annotations.JsPackage;
 import jsinterop.annotations.JsProperty;
 import jsinterop.annotations.JsType;
-import org.gwtproject.core.client.JavaScriptObject;
 
 /**
  * Organizes form controls into logical groups.
@@ -48,14 +47,14 @@ public static FieldSetElement as(Element elem) {
   }
 
   /**
-   * Determines whether the given {@link JavaScriptObject} can be cast to this class. A <code>null
+   * Determines whether the given object can be cast to this class. A <code>null
    * </code> object will cause this method to return <code>false</code>.
    *
    * @param o the object to check if it is an instance of this type
    * @return true of the object is an instance of this type, false otherwise
    */
   @JsOverlay
-  public static boolean is(JavaScriptObject o) {
+  public static boolean is(Object o) {
     if (Element.is(o)) {
       return is((Element) o);
     }
diff --git a/gwt-dom/src/main/java/org/gwtproject/dom/client/FormElement.java b/gwt-dom/src/main/java/org/gwtproject/dom/client/FormElement.java
index 22b84fb..929e793 100644
--- a/gwt-dom/src/main/java/org/gwtproject/dom/client/FormElement.java
+++ b/gwt-dom/src/main/java/org/gwtproject/dom/client/FormElement.java
@@ -19,7 +19,6 @@
 import jsinterop.annotations.JsPackage;
 import jsinterop.annotations.JsProperty;
 import jsinterop.annotations.JsType;
-import org.gwtproject.core.client.JavaScriptObject;
 import org.gwtproject.safehtml.shared.SafeUri;
 import org.gwtproject.safehtml.shared.annotations.IsSafeUri;
 
@@ -50,14 +49,14 @@ public static FormElement as(Element elem) {
   }
 
   /**
-   * Determines whether the given {@link JavaScriptObject} can be cast to this class. A <code>null
+   * Determines whether the given object can be cast to this class. A <code>null
    * </code> object will cause this method to return <code>false</code>.
    *
    * @param o the object to check if it is an instance of this type
    * @return true of the object is an instance of this type, false otherwise
    */
   @JsOverlay
-  public static boolean is(JavaScriptObject o) {
+  public static boolean is(Object o) {
     if (Element.is(o)) {
       return is((Element) o);
     }
diff --git a/gwt-dom/src/main/java/org/gwtproject/dom/client/FrameElement.java b/gwt-dom/src/main/java/org/gwtproject/dom/client/FrameElement.java
index 3ce16ca..cee7b1d 100644
--- a/gwt-dom/src/main/java/org/gwtproject/dom/client/FrameElement.java
+++ b/gwt-dom/src/main/java/org/gwtproject/dom/client/FrameElement.java
@@ -21,7 +21,6 @@
 import jsinterop.annotations.JsProperty;
 import jsinterop.annotations.JsType;
 import jsinterop.base.Js;
-import org.gwtproject.core.client.JavaScriptObject;
 import org.gwtproject.safehtml.shared.SafeUri;
 import org.gwtproject.safehtml.shared.annotations.IsSafeUri;
 import org.gwtproject.safehtml.shared.annotations.IsTrustedResourceUri;
@@ -53,14 +52,14 @@ public static FrameElement as(Element elem) {
   }
 
   /**
-   * Determines whether the given {@link JavaScriptObject} can be cast to this class. A <code>null
+   * Determines whether the given object can be cast to this class. A <code>null
    * </code> object will cause this method to return <code>false</code>.
    *
    * @param o the object to check if it is an instance of this type
    * @return true of the object is an instance of this type, false otherwise
    */
   @JsOverlay
-  public static boolean is(JavaScriptObject o) {
+  public static boolean is(Object o) {
     if (Element.is(o)) {
       return is((Element) o);
     }
diff --git a/gwt-dom/src/main/java/org/gwtproject/dom/client/FrameSetElement.java b/gwt-dom/src/main/java/org/gwtproject/dom/client/FrameSetElement.java
index 0c3fd87..d411b52 100644
--- a/gwt-dom/src/main/java/org/gwtproject/dom/client/FrameSetElement.java
+++ b/gwt-dom/src/main/java/org/gwtproject/dom/client/FrameSetElement.java
@@ -19,7 +19,6 @@
 import jsinterop.annotations.JsPackage;
 import jsinterop.annotations.JsProperty;
 import jsinterop.annotations.JsType;
-import org.gwtproject.core.client.JavaScriptObject;
 
 /**
  * Create a grid of frames.
@@ -48,14 +47,14 @@ public static FrameSetElement as(Element elem) {
   }
 
   /**
-   * Determines whether the given {@link JavaScriptObject} can be cast to this class. A <code>null
+   * Determines whether the given object can be cast to this class. A <code>null
    * </code> object will cause this method to return <code>false</code>.
    *
    * @param o the object to check if it is an instance of this type
    * @return true of the object is an instance of this type, false otherwise
    */
   @JsOverlay
-  public static boolean is(JavaScriptObject o) {
+  public static boolean is(Object o) {
     if (Element.is(o)) {
       return is((Element) o);
     }
diff --git a/gwt-dom/src/main/java/org/gwtproject/dom/client/HRElement.java b/gwt-dom/src/main/java/org/gwtproject/dom/client/HRElement.java
index 928a9c2..771184c 100644
--- a/gwt-dom/src/main/java/org/gwtproject/dom/client/HRElement.java
+++ b/gwt-dom/src/main/java/org/gwtproject/dom/client/HRElement.java
@@ -18,7 +18,6 @@
 import jsinterop.annotations.JsOverlay;
 import jsinterop.annotations.JsPackage;
 import jsinterop.annotations.JsType;
-import org.gwtproject.core.client.JavaScriptObject;
 
 /**
  * Create a horizontal rule.
@@ -46,14 +45,14 @@ public static HRElement as(Element elem) {
   }
 
   /**
-   * Determines whether the given {@link JavaScriptObject} can be cast to this class. A <code>null
+   * Determines whether the given object can be cast to this class. A <code>null
    * </code> object will cause this method to return <code>false</code>.
    *
    * @param o the object to check if it is an instance of this type
    * @return true of the object is an instance of this type, false otherwise
    */
   @JsOverlay
-  public static boolean is(JavaScriptObject o) {
+  public static boolean is(Object o) {
     if (Element.is(o)) {
       return is((Element) o);
     }
diff --git a/gwt-dom/src/main/java/org/gwtproject/dom/client/HeadElement.java b/gwt-dom/src/main/java/org/gwtproject/dom/client/HeadElement.java
index 176e0ee..83164f3 100644
--- a/gwt-dom/src/main/java/org/gwtproject/dom/client/HeadElement.java
+++ b/gwt-dom/src/main/java/org/gwtproject/dom/client/HeadElement.java
@@ -18,7 +18,6 @@
 import jsinterop.annotations.JsOverlay;
 import jsinterop.annotations.JsPackage;
 import jsinterop.annotations.JsType;
-import org.gwtproject.core.client.JavaScriptObject;
 
 /**
  * Document head information.
@@ -46,14 +45,14 @@ public static HeadElement as(Element elem) {
   }
 
   /**
-   * Determines whether the given {@link JavaScriptObject} can be cast to this class. A <code>null
+   * Determines whether the given object can be cast to this class. A <code>null
    * </code> object will cause this method to return <code>false</code>.
    *
    * @param o the object to check if it is an instance of this type
    * @return true of the object is an instance of this type, false otherwise
    */
   @JsOverlay
-  public static boolean is(JavaScriptObject o) {
+  public static boolean is(Object o) {
     if (Element.is(o)) {
       return is((Element) o);
     }
diff --git a/gwt-dom/src/main/java/org/gwtproject/dom/client/HeadingElement.java b/gwt-dom/src/main/java/org/gwtproject/dom/client/HeadingElement.java
index c3d9e38..a20ee71 100644
--- a/gwt-dom/src/main/java/org/gwtproject/dom/client/HeadingElement.java
+++ b/gwt-dom/src/main/java/org/gwtproject/dom/client/HeadingElement.java
@@ -19,7 +19,6 @@
 import jsinterop.annotations.JsOverlay;
 import jsinterop.annotations.JsPackage;
 import jsinterop.annotations.JsType;
-import org.gwtproject.core.client.JavaScriptObject;
 
 /**
  * For the H1 to H6 elements.
@@ -68,14 +67,14 @@ public static HeadingElement as(Element elem) {
   }
 
   /**
-   * Determines whether the given {@link JavaScriptObject} can be cast to this class. A <code>null
+   * Determines whether the given object can be cast to this class. A <code>null
    * </code> object will cause this method to return <code>false</code>.
    *
    * @param o the object to check if it is an instance of this type
    * @return true of the object is an instance of this type, false otherwise
    */
   @JsOverlay
-  public static boolean is(JavaScriptObject o) {
+  public static boolean is(Object o) {
     if (Element.is(o)) {
       return is((Element) o);
     }
diff --git a/gwt-dom/src/main/java/org/gwtproject/dom/client/IFrameElement.java b/gwt-dom/src/main/java/org/gwtproject/dom/client/IFrameElement.java
index f41e8f1..eb3ccf8 100644
--- a/gwt-dom/src/main/java/org/gwtproject/dom/client/IFrameElement.java
+++ b/gwt-dom/src/main/java/org/gwtproject/dom/client/IFrameElement.java
@@ -20,7 +20,6 @@
 import jsinterop.annotations.JsProperty;
 import jsinterop.annotations.JsType;
 import jsinterop.base.Js;
-import org.gwtproject.core.client.JavaScriptObject;
 import org.gwtproject.safehtml.shared.SafeUri;
 import org.gwtproject.safehtml.shared.annotations.IsSafeUri;
 
@@ -50,14 +49,14 @@ public static IFrameElement as(Element elem) {
   }
 
   /**
-   * Determines whether the given {@link JavaScriptObject} can be cast to this class. A <code>null
+   * Determines whether the given object can be cast to this class. A <code>null
    * </code> object will cause this method to return <code>false</code>.
    *
    * @param o the object to check if it is an instance of this type
    * @return true of the object is an instance of this type, false otherwise
    */
   @JsOverlay
-  public static boolean is(JavaScriptObject o) {
+  public static boolean is(Object o) {
     if (Element.is(o)) {
       return is((Element) o);
     }
diff --git a/gwt-dom/src/main/java/org/gwtproject/dom/client/ImageElement.java b/gwt-dom/src/main/java/org/gwtproject/dom/client/ImageElement.java
index 92d91ff..d0050ca 100644
--- a/gwt-dom/src/main/java/org/gwtproject/dom/client/ImageElement.java
+++ b/gwt-dom/src/main/java/org/gwtproject/dom/client/ImageElement.java
@@ -20,7 +20,6 @@
 import jsinterop.annotations.JsProperty;
 import jsinterop.annotations.JsType;
 import jsinterop.base.Js;
-import org.gwtproject.core.client.JavaScriptObject;
 
 /**
  * Embedded image.
@@ -48,14 +47,14 @@ public static ImageElement as(Element elem) {
   }
 
   /**
-   * Determines whether the given {@link JavaScriptObject} can be cast to this class. A <code>null
+   * Determines whether the given object can be cast to this class. A <code>null
    * </code> object will cause this method to return <code>false</code>.
    *
    * @param o the object to check if it is an instance of this type
    * @return true of the object is an instance of this type, false otherwise
    */
   @JsOverlay
-  public static boolean is(JavaScriptObject o) {
+  public static boolean is(Object o) {
     if (Element.is(o)) {
       return is((Element) o);
     }
diff --git a/gwt-dom/src/main/java/org/gwtproject/dom/client/InputElement.java b/gwt-dom/src/main/java/org/gwtproject/dom/client/InputElement.java
index b24ca57..49640a0 100644
--- a/gwt-dom/src/main/java/org/gwtproject/dom/client/InputElement.java
+++ b/gwt-dom/src/main/java/org/gwtproject/dom/client/InputElement.java
@@ -21,7 +21,6 @@
 import jsinterop.annotations.JsProperty;
 import jsinterop.annotations.JsType;
 import jsinterop.base.Js;
-import org.gwtproject.core.client.JavaScriptObject;
 
 /**
  * Form control.
@@ -53,14 +52,14 @@ public static InputElement as(Element elem) {
   }
 
   /**
-   * Determines whether the given {@link JavaScriptObject} can be cast to this class. A <code>null
+   * Determines whether the given object can be cast to this class. A <code>null
    * </code> object will cause this method to return <code>false</code>.
    *
    * @param o the object to check if it is an instance of this type
    * @return true of the object is an instance of this type, false otherwise
    */
   @JsOverlay
-  public static boolean is(JavaScriptObject o) {
+  public static boolean is(Object o) {
     if (Element.is(o)) {
       return is((Element) o);
     }
diff --git a/gwt-dom/src/main/java/org/gwtproject/dom/client/LIElement.java b/gwt-dom/src/main/java/org/gwtproject/dom/client/LIElement.java
index fac6dfc..4726f0e 100644
--- a/gwt-dom/src/main/java/org/gwtproject/dom/client/LIElement.java
+++ b/gwt-dom/src/main/java/org/gwtproject/dom/client/LIElement.java
@@ -18,7 +18,6 @@
 import jsinterop.annotations.JsOverlay;
 import jsinterop.annotations.JsPackage;
 import jsinterop.annotations.JsType;
-import org.gwtproject.core.client.JavaScriptObject;
 
 /**
  * List item.
@@ -46,14 +45,14 @@ public static LIElement as(Element elem) {
   }
 
   /**
-   * Determines whether the given {@link JavaScriptObject} can be cast to this class. A <code>null
+   * Determines whether the given object can be cast to this class. A <code>null
    * </code> object will cause this method to return <code>false</code>.
    *
    * @param o the object to check if it is an instance of this type
    * @return true of the object is an instance of this type, false otherwise
    */
   @JsOverlay
-  public static boolean is(JavaScriptObject o) {
+  public static boolean is(Object o) {
     if (Element.is(o)) {
       return is((Element) o);
     }
diff --git a/gwt-dom/src/main/java/org/gwtproject/dom/client/LabelElement.java b/gwt-dom/src/main/java/org/gwtproject/dom/client/LabelElement.java
index 6d1f5d4..7305774 100644
--- a/gwt-dom/src/main/java/org/gwtproject/dom/client/LabelElement.java
+++ b/gwt-dom/src/main/java/org/gwtproject/dom/client/LabelElement.java
@@ -19,7 +19,6 @@
 import jsinterop.annotations.JsPackage;
 import jsinterop.annotations.JsProperty;
 import jsinterop.annotations.JsType;
-import org.gwtproject.core.client.JavaScriptObject;
 
 /**
  * Form field label text.
@@ -47,14 +46,14 @@ public static LabelElement as(Element elem) {
   }
 
   /**
-   * Determines whether the given {@link JavaScriptObject} can be cast to this class. A <code>null
+   * Determines whether the given object can be cast to this class. A <code>null
    * </code> object will cause this method to return <code>false</code>.
    *
    * @param o the object to check if it is an instance of this type
    * @return true of the object is an instance of this type, false otherwise
    */
   @JsOverlay
-  public static boolean is(JavaScriptObject o) {
+  public static boolean is(Object o) {
     if (Element.is(o)) {
       return is((Element) o);
     }
diff --git a/gwt-dom/src/main/java/org/gwtproject/dom/client/LegendElement.java b/gwt-dom/src/main/java/org/gwtproject/dom/client/LegendElement.java
index 900cd8d..bb6fc2a 100644
--- a/gwt-dom/src/main/java/org/gwtproject/dom/client/LegendElement.java
+++ b/gwt-dom/src/main/java/org/gwtproject/dom/client/LegendElement.java
@@ -19,7 +19,6 @@
 import jsinterop.annotations.JsPackage;
 import jsinterop.annotations.JsProperty;
 import jsinterop.annotations.JsType;
-import org.gwtproject.core.client.JavaScriptObject;
 
 /**
  * Provides a caption for a FIELDSET grouping.
@@ -47,14 +46,14 @@ public static LegendElement as(Element elem) {
   }
 
   /**
-   * Determines whether the given {@link JavaScriptObject} can be cast to this class. A <code>null
+   * Determines whether the given object can be cast to this class. A <code>null
    * </code> object will cause this method to return <code>false</code>.
    *
    * @param o the object to check if it is an instance of this type
    * @return true of the object is an instance of this type, false otherwise
    */
   @JsOverlay
-  public static boolean is(JavaScriptObject o) {
+  public static boolean is(Object o) {
     if (Element.is(o)) {
       return is((Element) o);
     }
diff --git a/gwt-dom/src/main/java/org/gwtproject/dom/client/LinkElement.java b/gwt-dom/src/main/java/org/gwtproject/dom/client/LinkElement.java
index f268899..0578251 100644
--- a/gwt-dom/src/main/java/org/gwtproject/dom/client/LinkElement.java
+++ b/gwt-dom/src/main/java/org/gwtproject/dom/client/LinkElement.java
@@ -21,7 +21,6 @@
 import jsinterop.annotations.JsProperty;
 import jsinterop.annotations.JsType;
 import jsinterop.base.Js;
-import org.gwtproject.core.client.JavaScriptObject;
 import org.gwtproject.safehtml.shared.annotations.IsTrustedResourceUri;
 
 /**
@@ -51,14 +50,14 @@ public static LinkElement as(Element elem) {
   }
 
   /**
-   * Determines whether the given {@link JavaScriptObject} can be cast to this class. A <code>null
+   * Determines whether the given object can be cast to this class. A <code>null
    * </code> object will cause this method to return <code>false</code>.
    *
    * @param o the object to check if it is an instance of this type
    * @return true of the object is an instance of this type, false otherwise
    */
   @JsOverlay
-  public static boolean is(JavaScriptObject o) {
+  public static boolean is(Object o) {
     if (Element.is(o)) {
       return is((Element) o);
     }
diff --git a/gwt-dom/src/main/java/org/gwtproject/dom/client/MapElement.java b/gwt-dom/src/main/java/org/gwtproject/dom/client/MapElement.java
index 0885d7b..c6c541c 100644
--- a/gwt-dom/src/main/java/org/gwtproject/dom/client/MapElement.java
+++ b/gwt-dom/src/main/java/org/gwtproject/dom/client/MapElement.java
@@ -19,7 +19,6 @@
 import jsinterop.annotations.JsPackage;
 import jsinterop.annotations.JsProperty;
 import jsinterop.annotations.JsType;
-import org.gwtproject.core.client.JavaScriptObject;
 
 /**
  * Client-side image map.
@@ -47,14 +46,14 @@ public static MapElement as(Element elem) {
   }
 
   /**
-   * Determines whether the given {@link JavaScriptObject} can be cast to this class. A <code>null
+   * Determines whether the given object can be cast to this class. A <code>null
    * </code> object will cause this method to return <code>false</code>.
    *
    * @param o the object to check if it is an instance of this type
    * @return true of the object is an instance of this type, false otherwise
    */
   @JsOverlay
-  public static boolean is(JavaScriptObject o) {
+  public static boolean is(Object o) {
     if (Element.is(o)) {
       return is((Element) o);
     }
diff --git a/gwt-dom/src/main/java/org/gwtproject/dom/client/MetaElement.java b/gwt-dom/src/main/java/org/gwtproject/dom/client/MetaElement.java
index ffbdecc..0c5f016 100644
--- a/gwt-dom/src/main/java/org/gwtproject/dom/client/MetaElement.java
+++ b/gwt-dom/src/main/java/org/gwtproject/dom/client/MetaElement.java
@@ -19,7 +19,6 @@
 import jsinterop.annotations.JsPackage;
 import jsinterop.annotations.JsProperty;
 import jsinterop.annotations.JsType;
-import org.gwtproject.core.client.JavaScriptObject;
 
 /**
  * This contains generic meta-information about the document.
@@ -47,14 +46,14 @@ public static MetaElement as(Element elem) {
   }
 
   /**
-   * Determines whether the given {@link JavaScriptObject} can be cast to this class. A <code>null
+   * Determines whether the given object can be cast to this class. A <code>null
    * </code> object will cause this method to return <code>false</code>.
    *
    * @param o the object to check if it is an instance of this type
    * @return true of the object is an instance of this type, false otherwise
    */
   @JsOverlay
-  public static boolean is(JavaScriptObject o) {
+  public static boolean is(Object o) {
     if (Element.is(o)) {
       return is((Element) o);
     }
diff --git a/gwt-dom/src/main/java/org/gwtproject/dom/client/ModElement.java b/gwt-dom/src/main/java/org/gwtproject/dom/client/ModElement.java
index 895cab7..03b3dc0 100644
--- a/gwt-dom/src/main/java/org/gwtproject/dom/client/ModElement.java
+++ b/gwt-dom/src/main/java/org/gwtproject/dom/client/ModElement.java
@@ -19,7 +19,6 @@
 import jsinterop.annotations.JsPackage;
 import jsinterop.annotations.JsProperty;
 import jsinterop.annotations.JsType;
-import org.gwtproject.core.client.JavaScriptObject;
 import org.gwtproject.safehtml.shared.SafeUri;
 import org.gwtproject.safehtml.shared.annotations.IsSafeUri;
 
@@ -52,14 +51,14 @@ public static ModElement as(Element elem) {
   }
 
   /**
-   * Determines whether the given {@link JavaScriptObject} can be cast to this class. A <code>null
+   * Determines whether the given object can be cast to this class. A <code>null
    * </code> object will cause this method to return <code>false</code>.
    *
    * @param o the object to check if it is an instance of this type
    * @return true of the object is an instance of this type, false otherwise
    */
   @JsOverlay
-  public static boolean is(JavaScriptObject o) {
+  public static boolean is(Object o) {
     if (Element.is(o)) {
       return is((Element) o);
     }
diff --git a/gwt-dom/src/main/java/org/gwtproject/dom/client/Node.java b/gwt-dom/src/main/java/org/gwtproject/dom/client/Node.java
index fd95abf..1a65902 100644
--- a/gwt-dom/src/main/java/org/gwtproject/dom/client/Node.java
+++ b/gwt-dom/src/main/java/org/gwtproject/dom/client/Node.java
@@ -45,19 +45,19 @@ public class Node extends JavaScriptObject {
   public static short DOCUMENT_NODE;
 
   /**
-   * Assert that the given {@link JavaScriptObject} is a DOM node and automatically typecast it.
+   * Assert that the given object is a DOM node and automatically typecast it.
    *
    * @param o the object to assert is a Node
    * @return the object, cast to a Node
    */
   @JsOverlay
-  public static Node as(JavaScriptObject o) {
+  public static Node as(Object o) {
     assert is(o);
     return (Node) o;
   }
 
   /**
-   * Determines whether the given {@link JavaScriptObject} is a DOM node. A <code>null</code> object
+   * Determines whether the given object is a DOM node. A <code>null</code> object
    * will cause this method to return <code>false</code>. The try catch is needed for the firefox
    * permission error: "Permission denied to access property 'nodeType'"
    *
@@ -65,7 +65,7 @@ public static Node as(JavaScriptObject o) {
    * @return true of the object is an instance of this type, false otherwise
    */
   @JsOverlay
-  public static boolean is(JavaScriptObject o) {
+  public static boolean is(Object o) {
     try {
       return Js.isTruthy(o) && Js.isTruthy(Js.asPropertyMap(o).get("nodeType"));
     } catch (Exception e) {
diff --git a/gwt-dom/src/main/java/org/gwtproject/dom/client/OListElement.java b/gwt-dom/src/main/java/org/gwtproject/dom/client/OListElement.java
index 5b224ab..4154eaa 100644
--- a/gwt-dom/src/main/java/org/gwtproject/dom/client/OListElement.java
+++ b/gwt-dom/src/main/java/org/gwtproject/dom/client/OListElement.java
@@ -18,7 +18,6 @@
 import jsinterop.annotations.JsOverlay;
 import jsinterop.annotations.JsPackage;
 import jsinterop.annotations.JsType;
-import org.gwtproject.core.client.JavaScriptObject;
 
 /**
  * Ordered list.
@@ -46,14 +45,14 @@ public static OListElement as(Element elem) {
   }
 
   /**
-   * Determines whether the given {@link JavaScriptObject} can be cast to this class. A <code>null
+   * Determines whether the given object can be cast to this class. A <code>null
    * </code> object will cause this method to return <code>false</code>.
    *
    * @param o the object to check if it is an instance of this type
    * @return true of the object is an instance of this type, false otherwise
    */
   @JsOverlay
-  public static boolean is(JavaScriptObject o) {
+  public static boolean is(Object o) {
     if (Element.is(o)) {
       return is((Element) o);
     }
diff --git a/gwt-dom/src/main/java/org/gwtproject/dom/client/ObjectElement.java b/gwt-dom/src/main/java/org/gwtproject/dom/client/ObjectElement.java
index a26750b..f531f0d 100644
--- a/gwt-dom/src/main/java/org/gwtproject/dom/client/ObjectElement.java
+++ b/gwt-dom/src/main/java/org/gwtproject/dom/client/ObjectElement.java
@@ -19,7 +19,6 @@
 import jsinterop.annotations.JsPackage;
 import jsinterop.annotations.JsProperty;
 import jsinterop.annotations.JsType;
-import org.gwtproject.core.client.JavaScriptObject;
 import org.gwtproject.safehtml.shared.SafeUri;
 import org.gwtproject.safehtml.shared.annotations.IsTrustedResourceUri;
 import org.gwtproject.safehtml.shared.annotations.SuppressIsTrustedResourceUriCastCheck;
@@ -53,14 +52,14 @@ public static ObjectElement as(Element elem) {
   }
 
   /**
-   * Determines whether the given {@link JavaScriptObject} can be cast to this class. A <code>null
+   * Determines whether the given object can be cast to this class. A <code>null
    * </code> object will cause this method to return <code>false</code>.
    *
    * @param o the object to check if it is an instance of this type
    * @return true of the object is an instance of this type, false otherwise
    */
   @JsOverlay
-  public static boolean is(JavaScriptObject o) {
+  public static boolean is(Object o) {
     if (Element.is(o)) {
       return is((Element) o);
     }
diff --git a/gwt-dom/src/main/java/org/gwtproject/dom/client/OptGroupElement.java b/gwt-dom/src/main/java/org/gwtproject/dom/client/OptGroupElement.java
index ef40feb..305f50c 100644
--- a/gwt-dom/src/main/java/org/gwtproject/dom/client/OptGroupElement.java
+++ b/gwt-dom/src/main/java/org/gwtproject/dom/client/OptGroupElement.java
@@ -21,7 +21,6 @@
 import jsinterop.annotations.JsProperty;
 import jsinterop.annotations.JsType;
 import jsinterop.base.Js;
-import org.gwtproject.core.client.JavaScriptObject;
 
 /**
  * Group options together in logical subdivisions.
@@ -50,14 +49,14 @@ public static OptGroupElement as(Element elem) {
   }
 
   /**
-   * Determines whether the given {@link JavaScriptObject} can be cast to this class. A <code>null
+   * Determines whether the given object can be cast to this class. A <code>null
    * </code> object will cause this method to return <code>false</code>.
    *
    * @param o the object to check if it is an instance of this type
    * @return true of the object is an instance of this type, false otherwise
    */
   @JsOverlay
-  public static boolean is(JavaScriptObject o) {
+  public static boolean is(Object o) {
     if (Element.is(o)) {
       return is((Element) o);
     }
diff --git a/gwt-dom/src/main/java/org/gwtproject/dom/client/OptionElement.java b/gwt-dom/src/main/java/org/gwtproject/dom/client/OptionElement.java
index 10b53e1..b045256 100644
--- a/gwt-dom/src/main/java/org/gwtproject/dom/client/OptionElement.java
+++ b/gwt-dom/src/main/java/org/gwtproject/dom/client/OptionElement.java
@@ -21,7 +21,6 @@
 import jsinterop.annotations.JsProperty;
 import jsinterop.annotations.JsType;
 import jsinterop.base.Js;
-import org.gwtproject.core.client.JavaScriptObject;
 
 /**
  * A selectable choice.
@@ -49,14 +48,14 @@ public static OptionElement as(Element elem) {
   }
 
   /**
-   * Determines whether the given {@link JavaScriptObject} can be cast to this class. A <code>null
+   * Determines whether the given object can be cast to this class. A <code>null
    * </code> object will cause this method to return <code>false</code>.
    *
    * @param o the object to check if it is an instance of this type
    * @return true of the object is an instance of this type, false otherwise
    */
   @JsOverlay
-  public static boolean is(JavaScriptObject o) {
+  public static boolean is(Object o) {
     if (Element.is(o)) {
       return is((Element) o);
     }
diff --git a/gwt-dom/src/main/java/org/gwtproject/dom/client/ParagraphElement.java b/gwt-dom/src/main/java/org/gwtproject/dom/client/ParagraphElement.java
index 487db42..95d624f 100644
--- a/gwt-dom/src/main/java/org/gwtproject/dom/client/ParagraphElement.java
+++ b/gwt-dom/src/main/java/org/gwtproject/dom/client/ParagraphElement.java
@@ -18,7 +18,6 @@
 import jsinterop.annotations.JsOverlay;
 import jsinterop.annotations.JsPackage;
 import jsinterop.annotations.JsType;
-import org.gwtproject.core.client.JavaScriptObject;
 
 /**
  * Paragraphs.
@@ -46,14 +45,14 @@ public static ParagraphElement as(Element elem) {
   }
 
   /**
-   * Determines whether the given {@link JavaScriptObject} can be cast to this class. A <code>null
+   * Determines whether the given object can be cast to this class. A <code>null
    * </code> object will cause this method to return <code>false</code>.
    *
    * @param o the object to check if it is an instance of this type
    * @return true of the object is an instance of this type, false otherwise
    */
   @JsOverlay
-  public static boolean is(JavaScriptObject o) {
+  public static boolean is(Object o) {
     if (Element.is(o)) {
       return is((Element) o);
     }
diff --git a/gwt-dom/src/main/java/org/gwtproject/dom/client/ParamElement.java b/gwt-dom/src/main/java/org/gwtproject/dom/client/ParamElement.java
index 348545d..a104f6e 100644
--- a/gwt-dom/src/main/java/org/gwtproject/dom/client/ParamElement.java
+++ b/gwt-dom/src/main/java/org/gwtproject/dom/client/ParamElement.java
@@ -19,7 +19,6 @@
 import jsinterop.annotations.JsPackage;
 import jsinterop.annotations.JsProperty;
 import jsinterop.annotations.JsType;
-import org.gwtproject.core.client.JavaScriptObject;
 
 /**
  * Parameters fed to the OBJECT element.
@@ -47,14 +46,14 @@ public static ParamElement as(Element elem) {
   }
 
   /**
-   * Determines whether the given {@link JavaScriptObject} can be cast to this class. A <code>null
+   * Determines whether the given object can be cast to this class. A <code>null
    * </code> object will cause this method to return <code>false</code>.
    *
    * @param o the object to check if it is an instance of this type
    * @return true of the object is an instance of this type, false otherwise
    */
   @JsOverlay
-  public static boolean is(JavaScriptObject o) {
+  public static boolean is(Object o) {
     if (Element.is(o)) {
       return is((Element) o);
     }
diff --git a/gwt-dom/src/main/java/org/gwtproject/dom/client/PreElement.java b/gwt-dom/src/main/java/org/gwtproject/dom/client/PreElement.java
index 1c21657..6c8b78f 100644
--- a/gwt-dom/src/main/java/org/gwtproject/dom/client/PreElement.java
+++ b/gwt-dom/src/main/java/org/gwtproject/dom/client/PreElement.java
@@ -18,7 +18,6 @@
 import jsinterop.annotations.JsOverlay;
 import jsinterop.annotations.JsPackage;
 import jsinterop.annotations.JsType;
-import org.gwtproject.core.client.JavaScriptObject;
 
 /**
  * Preformatted text.
@@ -46,14 +45,14 @@ public static PreElement as(Element elem) {
   }
 
   /**
-   * Determines whether the given {@link JavaScriptObject} can be cast to this class. A <code>null
+   * Determines whether the given object can be cast to this class. A <code>null
    * </code> object will cause this method to return <code>false</code>.
    *
    * @param o the object to check if it is an instance of this type
    * @return true of the object is an instance of this type, false otherwise
    */
   @JsOverlay
-  public static boolean is(JavaScriptObject o) {
+  public static boolean is(Object o) {
     if (Element.is(o)) {
       return is((Element) o);
     }
diff --git a/gwt-dom/src/main/java/org/gwtproject/dom/client/QuoteElement.java b/gwt-dom/src/main/java/org/gwtproject/dom/client/QuoteElement.java
index 09d02e5..a04c474 100644
--- a/gwt-dom/src/main/java/org/gwtproject/dom/client/QuoteElement.java
+++ b/gwt-dom/src/main/java/org/gwtproject/dom/client/QuoteElement.java
@@ -19,7 +19,6 @@
 import jsinterop.annotations.JsPackage;
 import jsinterop.annotations.JsProperty;
 import jsinterop.annotations.JsType;
-import org.gwtproject.core.client.JavaScriptObject;
 import org.gwtproject.safehtml.shared.SafeUri;
 import org.gwtproject.safehtml.shared.annotations.IsSafeUri;
 
@@ -50,14 +49,14 @@ public static QuoteElement as(Element elem) {
   }
 
   /**
-   * Determines whether the given {@link JavaScriptObject} can be cast to this class. A <code>null
+   * Determines whether the given object can be cast to this class. A <code>null
    * </code> object will cause this method to return <code>false</code>.
    *
    * @param o the object to check if it is an instance of this type
    * @return true of the object is an instance of this type, false otherwise
    */
   @JsOverlay
-  public static boolean is(JavaScriptObject o) {
+  public static boolean is(Object o) {
     if (Element.is(o)) {
       return is((Element) o);
     }
diff --git a/gwt-dom/src/main/java/org/gwtproject/dom/client/ScriptElement.java b/gwt-dom/src/main/java/org/gwtproject/dom/client/ScriptElement.java
index f610331..f2341ee 100644
--- a/gwt-dom/src/main/java/org/gwtproject/dom/client/ScriptElement.java
+++ b/gwt-dom/src/main/java/org/gwtproject/dom/client/ScriptElement.java
@@ -19,7 +19,6 @@
 import jsinterop.annotations.JsPackage;
 import jsinterop.annotations.JsProperty;
 import jsinterop.annotations.JsType;
-import org.gwtproject.core.client.JavaScriptObject;
 import org.gwtproject.safehtml.shared.annotations.IsTrustedResourceUri;
 
 /**
@@ -49,14 +48,14 @@ public static ScriptElement as(Element elem) {
   }
 
   /**
-   * Determines whether the given {@link JavaScriptObject} can be cast to this class. A <code>null
+   * Determines whether the given object can be cast to this class. A <code>null
    * </code> object will cause this method to return <code>false</code>.
    *
    * @param o the object to check if it is an instance of this type
    * @return true of the object is an instance of this type, false otherwise
    */
   @JsOverlay
-  public static boolean is(JavaScriptObject o) {
+  public static boolean is(Object o) {
     if (Element.is(o)) {
       return is((Element) o);
     }
diff --git a/gwt-dom/src/main/java/org/gwtproject/dom/client/SelectElement.java b/gwt-dom/src/main/java/org/gwtproject/dom/client/SelectElement.java
index 4967790..9ae7339 100644
--- a/gwt-dom/src/main/java/org/gwtproject/dom/client/SelectElement.java
+++ b/gwt-dom/src/main/java/org/gwtproject/dom/client/SelectElement.java
@@ -21,7 +21,6 @@
 import jsinterop.annotations.JsProperty;
 import jsinterop.annotations.JsType;
 import jsinterop.base.Js;
-import org.gwtproject.core.client.JavaScriptObject;
 
 /**
  * The select element allows the selection of an option.
@@ -51,14 +50,14 @@ public static SelectElement as(Element elem) {
   }
 
   /**
-   * Determines whether the given {@link JavaScriptObject} can be cast to this class. A <code>null
+   * Determines whether the given object can be cast to this class. A <code>null
    * </code> object will cause this method to return <code>false</code>.
    *
    * @param o the object to check if it is an instance of this type
    * @return true of the object is an instance of this type, false otherwise
    */
   @JsOverlay
-  public static boolean is(JavaScriptObject o) {
+  public static boolean is(Object o) {
     if (Element.is(o)) {
       return is((Element) o);
     }
diff --git a/gwt-dom/src/main/java/org/gwtproject/dom/client/SourceElement.java b/gwt-dom/src/main/java/org/gwtproject/dom/client/SourceElement.java
index e886c8f..3dfd119 100644
--- a/gwt-dom/src/main/java/org/gwtproject/dom/client/SourceElement.java
+++ b/gwt-dom/src/main/java/org/gwtproject/dom/client/SourceElement.java
@@ -19,7 +19,6 @@
 import jsinterop.annotations.JsPackage;
 import jsinterop.annotations.JsProperty;
 import jsinterop.annotations.JsType;
-import org.gwtproject.core.client.JavaScriptObject;
 
 /**
  * The SOURCE element specifies one of potentially multiple source file in a media element.
@@ -47,14 +46,14 @@ public static SourceElement as(Element elem) {
   }
 
   /**
-   * Determines whether the given {@link JavaScriptObject} can be cast to this class. A <code>null
+   * Determines whether the given object can be cast to this class. A <code>null
    * </code> object will cause this method to return <code>false</code>.
    *
    * @param o the object to check if it is an instance of this type
    * @return true of the object is an instance of this type, false otherwise
    */
   @JsOverlay
-  public static boolean is(JavaScriptObject o) {
+  public static boolean is(Object o) {
     if (Element.is(o)) {
       return is((Element) o);
     }
diff --git a/gwt-dom/src/main/java/org/gwtproject/dom/client/SpanElement.java b/gwt-dom/src/main/java/org/gwtproject/dom/client/SpanElement.java
index 2e8963f..b03d38c 100644
--- a/gwt-dom/src/main/java/org/gwtproject/dom/client/SpanElement.java
+++ b/gwt-dom/src/main/java/org/gwtproject/dom/client/SpanElement.java
@@ -18,7 +18,6 @@
 import jsinterop.annotations.JsOverlay;
 import jsinterop.annotations.JsPackage;
 import jsinterop.annotations.JsType;
-import org.gwtproject.core.client.JavaScriptObject;
 
 /**
  * Generic inline container.
@@ -46,14 +45,14 @@ public static SpanElement as(Element elem) {
   }
 
   /**
-   * Determines whether the given {@link JavaScriptObject} can be cast to this class. A <code>null
+   * Determines whether the given object can be cast to this class. A <code>null
    * </code> object will cause this method to return <code>false</code>.
    *
    * @param o the object to check if it is an instance of this type
    * @return true of the object is an instance of this type, false otherwise
    */
   @JsOverlay
-  public static boolean is(JavaScriptObject o) {
+  public static boolean is(Object o) {
     if (Element.is(o)) {
       return is((Element) o);
     }
diff --git a/gwt-dom/src/main/java/org/gwtproject/dom/client/StyleElement.java b/gwt-dom/src/main/java/org/gwtproject/dom/client/StyleElement.java
index 4cc3f2f..6b3043b 100644
--- a/gwt-dom/src/main/java/org/gwtproject/dom/client/StyleElement.java
+++ b/gwt-dom/src/main/java/org/gwtproject/dom/client/StyleElement.java
@@ -21,7 +21,6 @@
 import jsinterop.annotations.JsProperty;
 import jsinterop.annotations.JsType;
 import jsinterop.base.Js;
-import org.gwtproject.core.client.JavaScriptObject;
 
 /**
  * Style information.
@@ -53,14 +52,14 @@ public static StyleElement as(Element elem) {
   }
 
   /**
-   * Determines whether the given {@link JavaScriptObject} can be cast to this class. A <code>null
+   * Determines whether the given object can be cast to this class. A <code>null
    * </code> object will cause this method to return <code>false</code>.
    *
    * @param o the object to check if it is an instance of this type
    * @return true of the object is an instance of this type, false otherwise
    */
   @JsOverlay
-  public static boolean is(JavaScriptObject o) {
+  public static boolean is(Object o) {
     if (Element.is(o)) {
       return is((Element) o);
     }
diff --git a/gwt-dom/src/main/java/org/gwtproject/dom/client/StyleInjector.java b/gwt-dom/src/main/java/org/gwtproject/dom/client/StyleInjector.java
index 52f6cd9..a63d68c 100644
--- a/gwt-dom/src/main/java/org/gwtproject/dom/client/StyleInjector.java
+++ b/gwt-dom/src/main/java/org/gwtproject/dom/client/StyleInjector.java
@@ -15,8 +15,7 @@
  */
 package org.gwtproject.dom.client;
 
-import org.gwtproject.core.client.JavaScriptObject;
-import org.gwtproject.core.client.JsArrayString;
+import elemental2.core.JsArray;
 import org.gwtproject.core.client.Scheduler;
 import org.gwtproject.core.client.Scheduler.ScheduledCommand;
 
@@ -29,9 +28,9 @@ public class StyleInjector {
 
   private static HeadElement head;
 
-  private static final JsArrayString toInject = JavaScriptObject.createArray().cast();
-  private static final JsArrayString toInjectAtEnd = JavaScriptObject.createArray().cast();
-  private static final JsArrayString toInjectAtStart = JavaScriptObject.createArray().cast();
+  private static final JsArray<String> toInject = new JsArray<>();
+  private static final JsArray<String> toInjectAtEnd = new JsArray<>();
+  private static final JsArray<String> toInjectAtStart = new JsArray<>();
 
   private static ScheduledCommand flusher =
       new ScheduledCommand() {
@@ -173,11 +172,11 @@ public static void setContents(StyleElement style, String contents) {
   }
 
   /** The <code>which</code> parameter is used to support the injectStylesheet API. */
-  private static StyleElement flush(JavaScriptObject which) {
+  private static StyleElement flush(JsArray<String> which) {
     StyleElement toReturn = null;
     StyleElement maybeReturn;
 
-    if (toInjectAtStart.length() != 0) {
+    if (toInjectAtStart.length != 0) {
       String css = toInjectAtStart.join("");
       maybeReturn = injectStyleSheetAtStart(css);
       if (toInjectAtStart == which) {
@@ -186,7 +185,7 @@ private static StyleElement flush(JavaScriptObject which) {
       toInjectAtStart.setLength(0);
     }
 
-    if (toInject.length() != 0) {
+    if (toInject.length != 0) {
       String css = toInject.join("");
       maybeReturn = injectStyleSheet(css);
       if (toInject == which) {
@@ -195,7 +194,7 @@ private static StyleElement flush(JavaScriptObject which) {
       toInject.setLength(0);
     }
 
-    if (toInjectAtEnd.length() != 0) {
+    if (toInjectAtEnd.length != 0) {
       String css = toInjectAtEnd.join("");
       maybeReturn = injectStyleSheetAtEnd(css);
       if (toInjectAtEnd == which) {
diff --git a/gwt-dom/src/main/java/org/gwtproject/dom/client/TableCaptionElement.java b/gwt-dom/src/main/java/org/gwtproject/dom/client/TableCaptionElement.java
index 682e296..d0c138a 100644
--- a/gwt-dom/src/main/java/org/gwtproject/dom/client/TableCaptionElement.java
+++ b/gwt-dom/src/main/java/org/gwtproject/dom/client/TableCaptionElement.java
@@ -18,7 +18,6 @@
 import jsinterop.annotations.JsOverlay;
 import jsinterop.annotations.JsPackage;
 import jsinterop.annotations.JsType;
-import org.gwtproject.core.client.JavaScriptObject;
 
 /**
  * Table caption.
@@ -46,14 +45,14 @@ public static TableCaptionElement as(Element elem) {
   }
 
   /**
-   * Determines whether the given {@link JavaScriptObject} can be cast to this class. A <code>null
+   * Determines whether the given object can be cast to this class. A <code>null
    * </code> object will cause this method to return <code>false</code>.
    *
    * @param o the object to check if it is an instance of this type
    * @return true of the object is an instance of this type, false otherwise
    */
   @JsOverlay
-  public static boolean is(JavaScriptObject o) {
+  public static boolean is(Object o) {
     if (Element.is(o)) {
       return is((Element) o);
     }
diff --git a/gwt-dom/src/main/java/org/gwtproject/dom/client/TableCellElement.java b/gwt-dom/src/main/java/org/gwtproject/dom/client/TableCellElement.java
index 05e221a..2eddaac 100644
--- a/gwt-dom/src/main/java/org/gwtproject/dom/client/TableCellElement.java
+++ b/gwt-dom/src/main/java/org/gwtproject/dom/client/TableCellElement.java
@@ -19,7 +19,6 @@
 import jsinterop.annotations.JsPackage;
 import jsinterop.annotations.JsProperty;
 import jsinterop.annotations.JsType;
-import org.gwtproject.core.client.JavaScriptObject;
 
 /**
  * The object used to represent the TH and TD elements.
@@ -48,14 +47,14 @@ public static TableCellElement as(Element elem) {
   }
 
   /**
-   * Determines whether the given {@link JavaScriptObject} can be cast to this class. A <code>null
+   * Determines whether the given object can be cast to this class. A <code>null
    * </code> object will cause this method to return <code>false</code>.
    *
    * @param o the object to check if it is an instance of this type
    * @return true of the object is an instance of this type, false otherwise
    */
   @JsOverlay
-  public static boolean is(JavaScriptObject o) {
+  public static boolean is(Object o) {
     if (Element.is(o)) {
       return is((Element) o);
     }
diff --git a/gwt-dom/src/main/java/org/gwtproject/dom/client/TableColElement.java b/gwt-dom/src/main/java/org/gwtproject/dom/client/TableColElement.java
index f0647cc..522c5f0 100644
--- a/gwt-dom/src/main/java/org/gwtproject/dom/client/TableColElement.java
+++ b/gwt-dom/src/main/java/org/gwtproject/dom/client/TableColElement.java
@@ -19,7 +19,6 @@
 import jsinterop.annotations.JsPackage;
 import jsinterop.annotations.JsProperty;
 import jsinterop.annotations.JsType;
-import org.gwtproject.core.client.JavaScriptObject;
 
 /**
  * Regroups the COL and COLGROUP elements.
@@ -48,14 +47,14 @@ public static TableColElement as(Element elem) {
   }
 
   /**
-   * Determines whether the given {@link JavaScriptObject} can be cast to this class. A <code>null
+   * Determines whether the given object can be cast to this class. A <code>null
    * </code> object will cause this method to return <code>false</code>.
    *
    * @param o the object to check if it is an instance of this type
    * @return true of the object is an instance of this type, false otherwise
    */
   @JsOverlay
-  public static boolean is(JavaScriptObject o) {
+  public static boolean is(Object o) {
     if (Element.is(o)) {
       return is((Element) o);
     }
diff --git a/gwt-dom/src/main/java/org/gwtproject/dom/client/TableElement.java b/gwt-dom/src/main/java/org/gwtproject/dom/client/TableElement.java
index 711a24f..c51edb4 100644
--- a/gwt-dom/src/main/java/org/gwtproject/dom/client/TableElement.java
+++ b/gwt-dom/src/main/java/org/gwtproject/dom/client/TableElement.java
@@ -19,7 +19,6 @@
 import jsinterop.annotations.JsPackage;
 import jsinterop.annotations.JsProperty;
 import jsinterop.annotations.JsType;
-import org.gwtproject.core.client.JavaScriptObject;
 
 /**
  * The create* and delete* methods on the table allow authors to construct and modify tables. [HTML
@@ -50,14 +49,14 @@ public static TableElement as(Element elem) {
   }
 
   /**
-   * Determines whether the given {@link JavaScriptObject} can be cast to this class. A <code>null
+   * Determines whether the given object can be cast to this class. A <code>null
    * </code> object will cause this method to return <code>false</code>.
    *
    * @param o the object to check if it is an instance of this type
    * @return true of the object is an instance of this type, false otherwise
    */
   @JsOverlay
-  public static boolean is(JavaScriptObject o) {
+  public static boolean is(Object o) {
     if (Element.is(o)) {
       return is((Element) o);
     }
diff --git a/gwt-dom/src/main/java/org/gwtproject/dom/client/TableRowElement.java b/gwt-dom/src/main/java/org/gwtproject/dom/client/TableRowElement.java
index ba6d83d..2c3b567 100644
--- a/gwt-dom/src/main/java/org/gwtproject/dom/client/TableRowElement.java
+++ b/gwt-dom/src/main/java/org/gwtproject/dom/client/TableRowElement.java
@@ -19,7 +19,6 @@
 import jsinterop.annotations.JsPackage;
 import jsinterop.annotations.JsProperty;
 import jsinterop.annotations.JsType;
-import org.gwtproject.core.client.JavaScriptObject;
 
 /**
  * A row in a table.
@@ -47,14 +46,14 @@ public static TableRowElement as(Element elem) {
   }
 
   /**
-   * Determines whether the given {@link JavaScriptObject} can be cast to this class. A <code>null
+   * Determines whether the given object can be cast to this class. A <code>null
    * </code> object will cause this method to return <code>false</code>.
    *
    * @param o the object to check if it is an instance of this type
    * @return true of the object is an instance of this type, false otherwise
    */
   @JsOverlay
-  public static boolean is(JavaScriptObject o) {
+  public static boolean is(Object o) {
     if (Element.is(o)) {
       return is((Element) o);
     }
diff --git a/gwt-dom/src/main/java/org/gwtproject/dom/client/TableSectionElement.java b/gwt-dom/src/main/java/org/gwtproject/dom/client/TableSectionElement.java
index 762eaa5..4f26d39 100644
--- a/gwt-dom/src/main/java/org/gwtproject/dom/client/TableSectionElement.java
+++ b/gwt-dom/src/main/java/org/gwtproject/dom/client/TableSectionElement.java
@@ -19,7 +19,6 @@
 import jsinterop.annotations.JsPackage;
 import jsinterop.annotations.JsProperty;
 import jsinterop.annotations.JsType;
-import org.gwtproject.core.client.JavaScriptObject;
 
 /** The THEAD, TFOOT, and TBODY elements. */
 @JsType(isNative = true, name = "Object", namespace = JsPackage.GLOBAL)
@@ -53,14 +52,14 @@ public static TableSectionElement as(Element elem) {
   }
 
   /**
-   * Determines whether the given {@link JavaScriptObject} can be cast to this class. A <code>null
+   * Determines whether the given object can be cast to this class. A <code>null
    * </code> object will cause this method to return <code>false</code>.
    *
    * @param o the object to check if it is an instance of this type
    * @return true of the object is an instance of this type, false otherwise
    */
   @JsOverlay
-  public static boolean is(JavaScriptObject o) {
+  public static boolean is(Object o) {
     if (Element.is(o)) {
       return is((Element) o);
     }
diff --git a/gwt-dom/src/main/java/org/gwtproject/dom/client/TextAreaElement.java b/gwt-dom/src/main/java/org/gwtproject/dom/client/TextAreaElement.java
index 615533a..0b193ce 100644
--- a/gwt-dom/src/main/java/org/gwtproject/dom/client/TextAreaElement.java
+++ b/gwt-dom/src/main/java/org/gwtproject/dom/client/TextAreaElement.java
@@ -21,7 +21,6 @@
 import jsinterop.annotations.JsProperty;
 import jsinterop.annotations.JsType;
 import jsinterop.base.Js;
-import org.gwtproject.core.client.JavaScriptObject;
 
 /**
  * Multi-line text field.
@@ -50,14 +49,14 @@ public static TextAreaElement as(Element elem) {
   }
 
   /**
-   * Determines whether the given {@link JavaScriptObject} can be cast to this class. A <code>null
+   * Determines whether the given object can be cast to this class. A <code>null
    * </code> object will cause this method to return <code>false</code>.
    *
    * @param o the object to check if it is an instance of this type
    * @return true of the object is an instance of this type, false otherwise
    */
   @JsOverlay
-  public static boolean is(JavaScriptObject o) {
+  public static boolean is(Object o) {
     if (Element.is(o)) {
       return is((Element) o);
     }
diff --git a/gwt-dom/src/main/java/org/gwtproject/dom/client/TitleElement.java b/gwt-dom/src/main/java/org/gwtproject/dom/client/TitleElement.java
index 813dfdf..691120f 100644
--- a/gwt-dom/src/main/java/org/gwtproject/dom/client/TitleElement.java
+++ b/gwt-dom/src/main/java/org/gwtproject/dom/client/TitleElement.java
@@ -19,7 +19,6 @@
 import jsinterop.annotations.JsPackage;
 import jsinterop.annotations.JsProperty;
 import jsinterop.annotations.JsType;
-import org.gwtproject.core.client.JavaScriptObject;
 
 /**
  * The document title.
@@ -47,14 +46,14 @@ public static TitleElement as(Element elem) {
   }
 
   /**
-   * Determines whether the given {@link JavaScriptObject} can be cast to this class. A <code>null
+   * Determines whether the given object can be cast to this class. A <code>null
    * </code> object will cause this method to return <code>false</code>.
    *
    * @param o the object to check if it is an instance of this type
    * @return true of the object is an instance of this type, false otherwise
    */
   @JsOverlay
-  public static boolean is(JavaScriptObject o) {
+  public static boolean is(Object o) {
     if (Element.is(o)) {
       return is((Element) o);
     }
diff --git a/gwt-dom/src/main/java/org/gwtproject/dom/client/UListElement.java b/gwt-dom/src/main/java/org/gwtproject/dom/client/UListElement.java
index fad2eee..61084f7 100644
--- a/gwt-dom/src/main/java/org/gwtproject/dom/client/UListElement.java
+++ b/gwt-dom/src/main/java/org/gwtproject/dom/client/UListElement.java
@@ -18,7 +18,6 @@
 import jsinterop.annotations.JsOverlay;
 import jsinterop.annotations.JsPackage;
 import jsinterop.annotations.JsType;
-import org.gwtproject.core.client.JavaScriptObject;
 
 /**
  * Unordered list.
@@ -46,14 +45,14 @@ public static UListElement as(Element elem) {
   }
 
   /**
-   * Determines whether the given {@link JavaScriptObject} can be cast to this class. A <code>null
+   * Determines whether the given object can be cast to this class. A <code>null
    * </code> object will cause this method to return <code>false</code>.
    *
    * @param o the object to check if it is an instance of this type
    * @return true of the object is an instance of this type, false otherwise
    */
   @JsOverlay
-  public static boolean is(JavaScriptObject o) {
+  public static boolean is(Object o) {
     if (Element.is(o)) {
       return is((Element) o);
     }