The document describes various HTML phrase tags that can be used to emphasize or format text. It discusses the <em>, <strong>, <abbr>, <acronym>, <dfn>, <blockquote>, <q>, <cite>, <code>, <kbd>, <var>, <samp>, and <address> tags and how they are typically displayed. It also covers the difference between block-level elements like <p> and <h1> that start on a new line, and inline elements like <b> and <i> that can appear within sentences.