LibWeb: Add CharacterData and Text IDL interfaces

Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/73645e11c4b

Libraries/LibWeb/DOM/CharacterData.h

@@ -36,11 +36,15 @@ class CharacterData
     : public Node
     , public NonDocumentTypeChildNode<CharacterData> {
 public:
+    using WrapperType = Bindings::CharacterDataWrapper;
+
     virtual ~CharacterData() override;
 
     const String& data() const { return m_data; }
     void set_data(const String& data) { m_data = data; }
 
+    unsigned length() const { return m_data.length(); }
+
     virtual String text_content() const override { return m_data; }
 
 protected:

Libraries/LibWeb/DOM/CharacterData.idl

@@ -0,0 +1,9 @@
+interface CharacterData : Node {
+
+    attribute DOMString data;
+    readonly attribute unsigned long length;
+
+    readonly attribute Element? nextElementSibling;
+    readonly attribute Element? previousElementSibling;
+
+}

Libraries/LibWeb/DOM/Text.h

@@ -34,6 +34,8 @@ namespace Web::DOM {
 
 class Text final : public CharacterData {
 public:
+    using WrapperType = Bindings::TextWrapper;
+
     explicit Text(Document&, const String&);
     virtual ~Text() override;
 

Libraries/LibWeb/DOM/Text.idl

@@ -0,0 +1,3 @@
+interface Text : CharacterData {
+
+}