8 nov 2013 23.47 John D:

> What is the advantage of using an ID here?


Identifying a particular page on the site. This can be used for instance in 
descending selectors for the navigation:

body#about-us-page nav li#about-us {
/*Apply styles for current page*/
}  


//and with class for a selections of pages:

body.articles nav li#articles

This is perhaps more useful in static web sites as you can change the HTML 
target elements server-side in a dynamic site. 
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