They show up as just a start tag. For the rest of the elements, the content is a sequence of data characters and nested elements. Some things such as forms and anchors cannot be nested, in which case this is mentioned in the text. Anchors and character highlighting may be put inside other constructs. Tags Most elements start and end with tags.
Empty elements have no end tag.
Until such time as support for these idioms is widely deployed, their use is strongly discouraged. The start and end tags for the HTML, HEAD, and BODY elements are omissable. The element name immediately follows the tag open delimiter. Names consist of a letter followed by up to 33 letters, digits, periods, or hyphens. Names are not case sensitive.