html elements what it means
It provides a means to create structured documents by denoting structural semantics for text such as headings, paragraphs, lists, links, quotes and other items. HTML elements are delineated by tags, written using angle brackets. Tags such as <img /> and <input /> introduce content into the page directly.
Some HTML elements are defined as empty elements and take the form < tag attribute1 = value1 attribute2 = value2 >. Empty elements may enclose no content, for instance, the  tag or the inline <img> tag. The name of an HTML element is the name used in the tags. Note that the end tag's name is preceded by a slash character, /, and that in empty elements the end tag is neither required nor allowed. If attributes are not mentioned, default values are used in each case. Element examples. Header of the HTML document: <head>...</head>.