The line break marker is a single marker and must not be written with an end marker. The paragraph marker is a double marker, and the end marker can be omitted or not. By default, the distance between paragraphs and the line spacing inside paragraphs are different, with larger paragraph spacing and smaller line spacing. html is unable to adjust paragraph spacing and line spacing, and if you need to adjust them, you must use CSS. in Dreamweaver CS5.5’s design view, press Enter ( Enter ) to quickly change paragraphs, and Shift+ Enter) key to quickly change lines.