Styles give the first-child inside a div a lime background. Divs have a thin blue border and 1em of padding.

First paragraph - first child styles make the background lime.

Second paragraph

First paragraph - with a style before it in the source. That style makes this text pink if it is still being executed

Second paragraph

First paragraph - with a script before it in the source, to make this text pink if it is still being executed

Second paragraph