Add documentation for css source code blocks

diff --git a/org-contrib/babel/languages/ob-doc-css.org b/org-contrib/babel/languages/ob-doc-css.org
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+#+OPTIONS:    H:3 num:nil toc:2 \n:nil @:t ::t |:t ^:{} -:t f:t *:t TeX:t LaTeX:t skip:nil d:(HIDE) tags:not-in-toc
+#+STARTUP:    align fold nodlcheck hidestars oddeven lognotestate hideblocks
+#+SEQ_TODO:   TODO(t) INPROGRESS(i) WAITING(w@) | DONE(d) CANCELED(c@)
+#+TAGS:       Write(w) Update(u) Fix(f) Check(c) noexport(n)
+#+TITLE:      CSS Source Code Blocks in Org Mode
+#+AUTHOR:     Thomas S. Dye
+#+EMAIL:      tsd[at]tsdye[dot]com
+#+LANGUAGE:   en
+#+STYLE:      <style type="text/css">#outline-container-introduction{ clear:both; }</style>
+#+LINK_UP:    ../languages.html
+#+LINK_HOME:  http://orgmode.org/worg/
+#+EXPORT_EXCLUDE_TAGS: noexport
+
+#+name: banner
+#+begin_html
+  <div id="subtitle" style="float: center; text-align: center;">
+  <p>
+  Org Mode support for <a
+  href="http://www.w3.org/Style/CSS/Overview.en.html">Cascading Style Sheets</a>
+  </p>
+  </div>
+#+end_html
+
+* Template Checklist [12/12]                                       :noexport:
+  - [X] Revise #+TITLE:
+  - [X] Indicate #+AUTHOR:
+  - [X] Add #+EMAIL:
+  - [X] Revise banner source block [3/3]
+    - [X] Add link to a useful language web site
+    - [X] Replace "Language" with language name
+    - [X] Find a suitable graphic and use it to link to the language
+      web site
+  - [X] Write an [[Introduction]]
+  - [X] Describe [[Requirements%20and%20Setup][Requirements and Setup]]
+  - [X] Replace "Language" with language name in [[Org%20Mode%20Features%20for%20Language%20Source%20Code%20Blocks][Org Mode Features for Language Source Code Blocks]]
+  - [X] Describe [[Header%20Arguments][Header Arguments]]
+  - [X] Describe support for [[Sessions]]
+  - [X] Describe [[Result%20Types][Result Types]]
+  - [X] Describe [[Other]] differences from supported languages
+  - [X] Provide brief [[Examples%20of%20Use][Examples of Use]]
+* Introduction
+CSS is a mechanism for adding style to Web documents.
+
+CSS can't be executed.  Org mode supports tangling of CSS source code blocks.
+* Requirements and Setup
+
+Emacs includes a css-mode.
+
+There is no need to activate CSS with =org-babel-do-load-languages=.
+
+* Org Mode Features for CSS Source Code Blocks
+** Header Arguments
+There are no language-specific default values or header arguments for CSS.
+** Sessions
+CSS doesn't support sessions.
+
+** Result Types
+CSS source code blocks don't return results.  They exist solely for
+tangling.