Add a test for a comment before the head.

Ms2ger · Ms2ger · commit fa51ea2fb92d · 2013-01-11T14:19:11.000+01:00
diff --git a/tree-construction/comments01.dat b/tree-construction/comments01.dat
@@ -133,3 +133,14 @@ FOO<!----->BAZ
 |     "FOO"
 |     <!-- - -->
 |     "BAZ"
+
+#data
+<html><!-- comment --><title>Comment before head</title>
+#errors
+#document
+| <html>
+|   <!-- comment -->
+|   <head>
+|     <title>
+|       "Comment before head"
+|   <body>
