1.2HTML document with basic grammar and specifications

   End labeled single wrap <br/> <p> paragraph, and paragraph is added after the blank lines
   doubly labeled <div> </ div> < span> </ span>
   tag format attribute <a href=""> </a> : <element name attribute name = "attribute value"> SUMMARY </ element name>
   
   page written in claim
      1. tag names are case insensitive, but try to unity, generally lower case
      2. The name attribute must be in lower case, the attribute value in double quotes up <IMG the src = "" />
      3. label must be strictly nested <a> <IMG the src = "" /> </a>
      4. double labeling must be strictly matched, even if they have an empty element is closed <a> < / a>
      
   browser parses the HTML mode
      browser: HTML, translator, read HTML pages and parse its meaning, and then interpret the results displayed on the screen
      streaming parsing of HTML: there is a HTML parser inside the browser, is responsible for the different labels and page content appear as different styles,
                      analytical analytical methods for the order from top to bottom
   multithreaded analytic way
      browsers parse different tags and content process will simultaneously read different resources and downloaded from the server and information