Line height on body tag

If set on

body
{
line-height: 200%;
}

.test
{
line-height: normal;
}

Is no need to set another element? Only that way if want to update that 200%? So is apply on all?

Thanks!

Do you want every header, footer, sidebar, list, menu, and paragraph to look double-spaced? Then yes. But, you probably only want the main-content to be double-spaced.