Add NonDocumentTypeChildNode

Author: japgolly

src/main/scala/org/scalajs/dom/raw/lib.scala

@@ -785,6 +785,32 @@ trait ParentNode extends js.Object {
 
 }
 
+/**
+ * The NonDocumentTypeChildNode interface contains methods that are particular to
+ * Node objects that can have a parent, but not suitable for DocumentType.
+ *
+ * NonDocumentTypeChildNode is a raw interface and no object of this type can be
+ * created; it is implemented by Element, and CharacterData objects.
+ *
+ * https://developer.mozilla.org/en-US/docs/Web/API/NonDocumentTypeChildNode
+ */
+trait NonDocumentTypeChildNode extends js.Object {
+
+  /**
+   * Returns the Element immediately prior to this node in its parent's children list.
+   *
+   * MDN
+   */
+  def previousElementSibling: js.UndefOr[Element] = js.native
+
+  /**
+   * Returns the Element immediately following this node in its parent's children list.
+   *
+   * MDN
+   */
+  def nextElementSibling: js.UndefOr[Element] = js.native
+}
+
 /**
  * The Element interface represents part of the document. This interface describes
  * methods and properties common to each kind of elements. Specific behaviors are
@@ -793,7 +819,7 @@ trait ParentNode extends js.Object {
  *
  * https://developer.mozilla.org/en-US/docs/Web/API/element
  */
-abstract class Element extends Node with NodeSelector with ParentNode {
+abstract class Element extends Node with NodeSelector with ParentNode with NonDocumentTypeChildNode {
 
 
   /**
@@ -5689,7 +5715,7 @@ class StorageEvent extends Event {
  *
  * MDN
  */
-abstract class CharacterData extends Node {
+abstract class CharacterData extends Node with NonDocumentTypeChildNode {
   /**
    * Returns an unsigned long representing the size of the string contained in
    * CharacterData.data.