#+begin_src
No language
#+end_src

#+begin_src emacs-lisp
Default
#+end_src

#+begin_src elisp
Alternative language name
#+end_src elisp

#+BEGIN_SRC emacs-lisp
Upper case
#+END_SRC

#+BEGIN_SRC shell
Different language
#+END_SRC

#+begin_src emacs-lisp :tangle yes
:tangle yes
#+end_src

#+begin_src emacs-lisp  :tangle yes 
Extra spaces around params
#+end_src

#+begin_src emacs-lisp :tangle no
:tangle no
#+end_src