Fix the following error:

rubys · rubys · commit 9aee9d7b1a70 · 2007-08-12T19:13:41.000Z
http://lists.planetplanet.org/archives/devel/2007-August/001638.html Note: the fact that html5lib and the DOM produced differ on what the parent is for this child being removed may indicate a deeper software error. I've not investigaged further at this time. --HG-- extra : convert_revision : svn%3Aacbfec75-9323-0410-a652-858a13e371e0/trunk%40950
diff --git a/src/html5lib/treebuilders/dom.py b/src/html5lib/treebuilders/dom.py
@@ -41,7 +41,8 @@ def insertBefore(self, node, refNode):
         node.parent = self
 
     def removeChild(self, node):
-        self.element.removeChild(node.element)
+        if node.element.parentNode == self.element:
+            self.element.removeChild(node.element)
         node.parent = None
 
     def reparentChildren(self, newParent):
diff --git a/tests/test_lxp.py b/tests/test_lxp.py
@@ -227,6 +227,19 @@ def test_prolog(self):
 <body>
 </body></html>""")
 
+  def test_tagsoup(self):
+    self.assertXhtmlEquals(
+"""<html xmlns="http://www.w3.org/1999/xhtml">
+<head><title>TAGSOUP</title></head>
+<body>
+<u><blockquote><p></u>
+</body></html>""",
+"""<html xmlns="http://www.w3.org/1999/xhtml">
+<head><title>TAGSOUP</title></head>
+<body>
+<u/><blockquote><u/><p><u/>
+</p></blockquote></body></html>""")
+
 def buildTestSuite():
   return unittest.defaultTestLoader.loadTestsFromName(__name__)
 
