diff --git a/Gruntfile.coffee b/Gruntfile.coffee
index 9eac1679d..ed5a9ef8d 100755
--- a/Gruntfile.coffee
+++ b/Gruntfile.coffee
@@ -28,6 +28,7 @@ module.exports = (grunt) ->
           'src/General/UI.coffee'
           'src/General/Notice.coffee'
           'src/General/CrossOrigin.coffee'
+          'src/General/BuildTest.coffee'
           'src/Filtering/**/*.coffee'
           'src/Quotelinks/**/*.coffee'
           'src/Posting/QR.coffee'
diff --git a/src/General/BuildTest.coffee b/src/General/BuildTest.coffee
new file mode 100644
index 000000000..cc350b511
--- /dev/null
+++ b/src/General/BuildTest.coffee
@@ -0,0 +1,25 @@
+BuildTest =
+  init: ->
+    return if !Conf['Menu']
+
+    a = $.el 'a',
+      textContent: 'Test HTML building'
+
+    $.on a, 'click', @runTest
+
+    $.event 'AddMenuEntry',
+      type: 'post'
+      el: a
+      open: (post) ->
+        a.dataset.fullID = post.fullID
+
+  runTest: ->
+    post = g.posts[@dataset.fullID]
+    c.log post.originalHTML
+    $.cache "//a.4cdn.org/#{post.board.ID}/thread/#{post.thread.ID}.json", ->
+      for postData in @response.posts
+        if postData.no is post.ID
+          root = Build.postFromObject postData, post.board.ID
+          post2 = new Post root, post.thread, post.board
+          c.log post2.originalHTML
+
diff --git a/src/General/Main.coffee b/src/General/Main.coffee
index 596a9d497..684c5a24c 100755
--- a/src/General/Main.coffee
+++ b/src/General/Main.coffee
@@ -345,6 +345,7 @@ Main =
     ['Keybinds',                  Keybinds]
     ['Show Dice Roll',            Dice]
     ['Banner',                    Banner]
+    ['Build Test',                BuildTest]
   ]
 
 Main.init()
diff --git a/src/General/lib/post.class b/src/General/lib/post.class
index fa9f681d7..5c1dcea3f 100755
--- a/src/General/lib/post.class
+++ b/src/General/lib/post.class
@@ -3,6 +3,10 @@ class Post
   toString: -> @ID
 
   constructor: (root, @thread, @board, that={}) ->
+    root2 = root.cloneNode true
+    $.rm el for el in $$ '.mobile', root2
+    @originalHTML = root2.outerHTML
+
     @ID     = +root.id[2..]
     @fullID = "#{@board}.#{@ID}"