No empty line is added. Creates a horizontal rule. Acts as a page divider. These tags act independantly. They do not need to occur in pairs.
Text enclosed within non-empty tags is subject to the corresponding action.
Go to the Style Tags example to review the Italic and Bold tags. This is useful for creating templates and joint authoring. A comment functions as a disabled tag. If tags occur in pairs, disable both tags or funny things can happen. Appear on the top of the page in the title bar.