Review the parser for css3 selectors

[c9s]

Reference: http://www.w3.org/TR/css3-selectors/

• [ ] Universal selectors and namespaces http://www.w3.org/TR/css3-selectors/#univnmsp

• [ ] Attribute selectors and namespaces http://www.w3.org/TR/css3-selectors/#attrnmsp

• [ ] :nth-child() pseudo-class: The nth grammar:

      nth
          : S* [ ['-'|'+']? INTEGER? {N} [ S* ['-'|'+'] S* INTEGER ]? |
               ['-'|'+']? INTEGER | {O}{D}{D} | {E}{V}{E}{N} ] S*
              ;
  

  Examples:

      tr:nth-child(2n+1) /* represents every odd row of an HTML table */
      tr:nth-child(odd)  /* same */
      tr:nth-child(2n+0) /* represents every even row of an HTML table */
      tr:nth-child(even) /* same */
  
      /* Alternate paragraph colours in CSS */
      p:nth-child(4n+1) { color: navy; }
      p:nth-child(4n+2) { color: green; }
      p:nth-child(4n+3) { color: maroon; }
      p:nth-child(4n+4) { color: purple; }
  

• [ ] Move lang(), empty(), not() to function pseudo selector