Headings HTML contains six levels of headings, numbered 1 through 6. All headings are bold and have blank lines before and after them by default. In HTML Web browsers ignore carriage returns, indentations, and blank lines or spaces. This tag does not have a closing tag. Ordered lists are numbered automatically by the browser.
Unordered lists use bullets to identify each item in the list.
Definition lists format title and detailed information. The ALT attribute specifies a text alternative for the image so when users have images turned off or are using a browser that does not display images, they see the alternative text. The width and thickness of the line can be adjusted using attributes with this tag. In addition to linking to other web pages or documents, links can be created from one part of a document to another. This is helpful with very long documents that may contain a table of contents.