diff --git a/src/mechanize.cr b/src/mechanize.cr
index bca31f3..bbec91a 100644
--- a/src/mechanize.cr
+++ b/src/mechanize.cr
@@ -1,3 +1,6 @@
+require "uri"
+require "http/client"
+require "lexbor"
 require "./mechanize/http/agent"
 require "./mechanize/form"
 require "./mechanize/node"
@@ -73,13 +76,13 @@ class Mechanize
   def post(uri : String | URI,
            headers = ::HTTP::Headers.new,
            query : Hash(String, String | Array(String)) = Hash(String, String).new) : Mechanize::Page
-    node = Node.new
+    node = Mechanize::Node.new
     node["method"] = "POST"
     node["enctype"] = "application/x-www-form-urlencoded"
 
     form = Mechanize::Form.new(node)
     query.each do |k, v|
-      node = Node.new
+      node = Mechanize::Node.new
       node["name"] = k
       form.fields << Mechanize::FormContent::Field.new(node, v)
     end
diff --git a/src/mechanize/file.cr b/src/mechanize/file.cr
index 9ec0b40..be8436c 100644
--- a/src/mechanize/file.cr
+++ b/src/mechanize/file.cr
@@ -1,5 +1,3 @@
-require "http/client"
-
 class Mechanize
   abstract class File
     # property :filename
diff --git a/src/mechanize/form.cr b/src/mechanize/form.cr
index fc5e254..0a7fd18 100644
--- a/src/mechanize/form.cr
+++ b/src/mechanize/form.cr
@@ -13,7 +13,7 @@ class Mechanize
   class Form
     include ElementMatcher
 
-    getter node : Node | Lexbor::Node
+    getter node : Mechanize::Node | Lexbor::Node
     # returns hoge array of `Mechanize::FormContent::Field` in the form.
     getter fields : Array(FormContent::Field)
     # returns an array of input tags whose type is checkbox in the form.
@@ -35,7 +35,7 @@ class Mechanize
     # returns the page which includes the form.
     getter page : Page?
 
-    def initialize(node : Node | Lexbor::Node, page : Page? = nil)
+    def initialize(node : Mechanize::Node | Lexbor::Node, page : Page? = nil)
       @enctype = node.fetch("enctype", "application/x-www-form-urlencoded")
       @node = node
       @fields = Array(FormContent::Field).new
diff --git a/src/mechanize/form/button.cr b/src/mechanize/form/button.cr
index dab59f5..2cdc247 100644
--- a/src/mechanize/form/button.cr
+++ b/src/mechanize/form/button.cr
@@ -1,9 +1,9 @@
 # This class represents button related html element.
 # &lt;button&gt;, and &lt;input&gt; whose type is button, reset, image, submit.
 class Mechanize::FormContent::Button < Mechanize::FormContent::Field
-  getter form_node : Node | Lexbor::Node
+  getter form_node : Mechanize::Node | Lexbor::Node
 
-  def initialize(node : Node | Lexbor::Node, form_node : Node | Lexbor::Node, value = nil)
+  def initialize(node : Mechanize::Node | Lexbor::Node, form_node : Mechanize::Node | Lexbor::Node, value = nil)
     @form_node = form_node
     super(node, value)
   end
diff --git a/src/mechanize/form/field.cr b/src/mechanize/form/field.cr
index 62166d9..4c12bb4 100644
--- a/src/mechanize/form/field.cr
+++ b/src/mechanize/form/field.cr
@@ -9,9 +9,9 @@ class Mechanize::FormContent::Field
   # returns field's 'value' attribute.
   # value property is changeable, but this property stores raw value.
   getter raw_value : String?
-  getter node : Node | Lexbor::Node
+  getter node : Mechanize::Node | Lexbor::Node
 
-  def initialize(node : Node | Lexbor::Node, value = nil)
+  def initialize(node : Mechanize::Node | Lexbor::Node, value = nil)
     @node = node
     @name = node.fetch("name", "")
     @value = value || node.fetch("value", nil)
diff --git a/src/mechanize/form/radio_button.cr b/src/mechanize/form/radio_button.cr
index efb0b48..085bc70 100644
--- a/src/mechanize/form/radio_button.cr
+++ b/src/mechanize/form/radio_button.cr
@@ -2,7 +2,7 @@
 class Mechanize::FormContent::RadioButton < Mechanize::FormContent::Field
   property :checked, :form
 
-  def initialize(node : Node | Lexbor::Node, form : Form)
+  def initialize(node : Mechanize::Node | Lexbor::Node, form : Form)
     @checked = !!node.fetch("checked", nil)
     @form = form
     super(node)
diff --git a/src/mechanize/http/agent.cr b/src/mechanize/http/agent.cr
index 7a94879..c7fe6f9 100644
--- a/src/mechanize/http/agent.cr
+++ b/src/mechanize/http/agent.cr
@@ -1,5 +1,3 @@
-require "uri"
-require "http/client"
 require "../cookie"
 require "../history"
 
diff --git a/src/mechanize/node.cr b/src/mechanize/node.cr
index 4915952..5367aaa 100644
--- a/src/mechanize/node.cr
+++ b/src/mechanize/node.cr
@@ -1,21 +1,12 @@
-require "lexbor"
+class Mechanize
+  # This is a fake node used when sending post request.
+  class Node < Hash(String, String)
+    def css(str)
+      [] of Hash(String, String)
+    end
 
-# This is a fake node used when sending post request.
-class Node < Hash(String, String)
-  def css(str)
-    [] of Hash(String, String)
-  end
-
-  def inner_text
-    ""
+    def inner_text
+      ""
+    end
   end
 end
-
-# This is a real Node got from html.
-struct Lexbor::Node
-  delegate :[], to: attributes
-  delegate :[]=, to: attributes
-  delegate :[]?, to: attributes
-  delegate :fetch, to: attributes
-  delegate :has_key?, to: attributes
-end