The style declarations which apply to the text below are:

BODY {color: green;}
H3 {color: blue;}
EM {color: purple;}
.one {font-style: italic;}
.two {text-decoration: underline;}
#two,#twot {color: navy;}
.three {color: purple;}

This sentence should show blue and purple.

This sentence should be blue throughout.

This should be green except for the emphasized words, which should be purple.

This should be blue and underlined.

This sentence should be underlined, including this part, this part, this part, and this part.

This sentence should also be underlined, as well as dark blue (navy), including this part.

This sentence should be purple, including this part and this part (which is spanned).