DOM is a tree of hodes, HTML is used to define the tree. Each DOM node generates a box. Different node types generate different types of boxes by default. CSS c

DOM is a tree of hodes, HTML is used to define the tree. Each DOM node generates a box. Different node types generate different types of boxes by default. CSS controls visual formatting of the boxes, including changing the box type. The CSS 2.1 visual formatting model specification no longer covers everything CSS can do, but I found it useful when trying to get a feel for what was going on back in the day: http://www.w3.org/TR/CSS21/visuren.html http://www.w3.org/TR/CSS21/visuren.html