diff --git a/src/htmlnode.py b/src/htmlnode.py
new file mode 100644
index 0000000..bd672ff
--- /dev/null
+++ b/src/htmlnode.py
@@ -0,0 +1,58 @@
+class HTMLNode:
+    def __init__(self, tag=None, value=None, children=None, props=None) -> None:
+        self.tag = tag
+        self.value = value
+        self.children = children
+        self.props = props
+
+    def to_html(self):
+        raise NotImplementedError("to_html method not implemented")
+    
+    def props_to_html(self):
+        props = ""
+
+        if self.props is None:
+            return props
+
+        for key in self.props:
+            props += f" {key}=\"{self.props[key]}\""
+
+        return props
+    
+    def __repr__(self):
+        return f"HTMLNode({self.tag}, {self.value}, {self.children}, {self.props})"
+    
+class LeafNode(HTMLNode):
+    def __init__(self, tag=None, value=None, props=None) -> None:
+        super().__init__(tag, value, None, props)
+
+    def to_html(self):
+        if self.value is None:
+            raise ValueError("Invalid HTML: no value")
+        if self.tag is None:
+            return self.value
+        props = self.props_to_html()
+        return f"<{self.tag}{props}>{self.value}</{self.tag}>"
+    
+    def __repr__(self):
+        return f"LeafNode({self.tag}, {self.value}, {self.props})"
+    
+
+class ParentNode(HTMLNode):
+    def __init__(self, tag=None, children=None, props=None) -> None:
+        super().__init__(tag, None, children, props)
+
+    def to_html(self):
+        if self.tag is None:
+            raise ValueError("No tag specified")
+        if self.children is None:
+            raise ValueError("No children specified")
+        
+        html = f"<{self.tag}{self.props_to_html()}>"
+
+        for child in self.children:
+            html+=child.to_html()
+
+        html += f"</{self.tag}>"
+
+        return html
\ No newline at end of file
diff --git a/src/test_htmlnode.py b/src/test_htmlnode.py
new file mode 100644
index 0000000..21eb358
--- /dev/null
+++ b/src/test_htmlnode.py
@@ -0,0 +1,72 @@
+import unittest
+from htmlnode import LeafNode, ParentNode, HTMLNode
+
+
+class TestHTMLNode(unittest.TestCase):
+    def test_to_html_props(self):
+        node = HTMLNode(
+            "div",
+            "Hello, world!",
+            None,
+            {"class": "greeting", "href": "https://boot.dev"},
+        )
+        self.assertEqual(
+            node.props_to_html(),
+            ' class="greeting" href="https://boot.dev"',
+        )
+
+    def test_to_html_no_children(self):
+        node = LeafNode("p", "Hello, world!")
+        self.assertEqual(node.to_html(), "<p>Hello, world!</p>")
+
+    def test_to_html_no_tag(self):
+        node = LeafNode(None, "Hello, world!")
+        self.assertEqual(node.to_html(), "Hello, world!")
+
+    def test_to_html_with_children(self):
+        child_node = LeafNode("span", "child")
+        parent_node = ParentNode("div", [child_node])
+        self.assertEqual(parent_node.to_html(), "<div><span>child</span></div>")
+
+    def test_to_html_with_grandchildren(self):
+        grandchild_node = LeafNode("b", "grandchild")
+        child_node = ParentNode("span", [grandchild_node])
+        parent_node = ParentNode("div", [child_node])
+        self.assertEqual(
+            parent_node.to_html(),
+            "<div><span><b>grandchild</b></span></div>",
+        )
+
+    def test_to_html_many_children(self):
+        node = ParentNode(
+            "p",
+            [
+                LeafNode("b", "Bold text"),
+                LeafNode(None, "Normal text"),
+                LeafNode("i", "italic text"),
+                LeafNode(None, "Normal text"),
+            ],
+        )
+        self.assertEqual(
+            node.to_html(),
+            "<p><b>Bold text</b>Normal text<i>italic text</i>Normal text</p>",
+        )
+
+    def test_headings(self):
+        node = ParentNode(
+            "h2",
+            [
+                LeafNode("b", "Bold text"),
+                LeafNode(None, "Normal text"),
+                LeafNode("i", "italic text"),
+                LeafNode(None, "Normal text"),
+            ],
+        )
+        self.assertEqual(
+            node.to_html(),
+            "<h2><b>Bold text</b>Normal text<i>italic text</i>Normal text</h2>",
+        )
+
+
+if __name__ == "__main__":
+    unittest.main()
\ No newline at end of file