<!DOCTYPE> should be contains last \n

autoload/emmet/lang/html.vim

@@ -120,7 +120,7 @@ function! emmet#lang#html#parseIntoTree(abbr, type)
         if use_pipe_for_cursor
           let snippet = substitute(snippet, '|', '${cursor}', 'g')
         endif
-        let lines = split(snippet, "\n")
+        let lines = split(snippet, "\n", 1)
         call map(lines, 'substitute(v:val, "\\(    \\|\\t\\)", escape(indent, "\\\\"), "g")')
         let current.snippet = join(lines, "\n")
         let current.name = ''