Elements of Structural Markup
Headings
Think of headings as the outline to your document. <h1> is the primary headline with each heading level falling beneath that. Use headings to delineate sections of your document, not just to make larger text.
Assistive technology uses headings for navigation within a page and to quickly skip to topic headings on a page.
Lists
Lists convey a hierarchical content structure. Lists should never be used to control indentation or layout. List types should be used properly: <ul> should be used for lists with no order; <ol> for ordered lists; and <dl> for definition lists. If you don't want to see bullets displayed use style sheets to control the appearance of lists.
Blockquotes
Blockquotes should only be used if the content is a quotation. Don’t use the blockquote tag to control indentation. Use CSS for indentation.