                       The <dfn>dfn element</dfn> indicates a
                                definition.
                            </p>
                            <p>
                                The <mark>mark element</mark> indicates a
                                highlight.
                            </p>
                            <p>
                                The <var>variable element</var>, such as
                                <var>x</var> = <var>y</var>.
                         