The hr element represents a paragraph-level thematic break.
empty (void element)
The hr element is a void element. An hr element must have a start tag but must not have an end tag.
any element that can contain flow elements
Although previous versions of HTML defined the hr element only in presentational terms, the element has now been given the specific semantic purpose of representing a “paragraph-level thematic break”.
Some examples of thematic breaks that can be marked up using the hr element include a scene change in a story, or a transition to another topic within a section of a reference book.
interface HTMLHRElement : HTMLElement {};