HTML Render with example UI

src/main/java/org/openautonomousconnection/htmlparser/dom/DomNode.java

@@ -0,0 +1,26 @@
+package org.openautonomousconnection.htmlparser.dom;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public abstract class DomNode {
+    protected DomNode parent;
+    protected final List<DomNode> children = new ArrayList<>();
+
+    public DomNode getParent() { return parent; }
+    public List<DomNode> getChildren() { return children; }
+
+    public void appendChild(DomNode child) {
+        if (child == null) return;
+        if (child.parent != null) child.parent.children.remove(child);
+        child.parent = this;
+        children.add(child);
+    }
+
+    public void removeChild(DomNode child) {
+        if (child == null) return;
+        if (children.remove(child)) child.parent = null;
+    }
+
+    public abstract String nodeName();
+}