Box model: margin | border | padding | content | padding | border | margin
margin is always transparent

table: "border-collapse: collapse"

names must be: [a-zA-Z][a-zA-Z0-9-]*    -- hyphens; not underscores!

.class
#id

-- pseudo classes:
:active         -- between button-down and button-up
:first-child
:focus
:hover
:lang(X)
:link
:visited

-- pseudo elements:
:after          -- to insert content after an element's content (content: xxx)
:before         -- to insert content before an element's content (content: xxx)
:first-letter
:first-line
