doc type / transitional 


  <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
      "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
  <html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">
  <head>
  <title>Chapter 2: Scalable Navigation</title>
  <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />