For more about the elements used, please read Quoting in HTML.
Inline quotes
Follow guidelines for when to use inline quotes. Use the <q> element, which surrounds the text in quotation marks. The <q> element may be nested and provides the correct quotation marks.
Based on the ALA Bill of Rights, libraries should not exclude materials because of the origin, age, background, or views of those contributing to their creation.
<p>Based on the <acronym title="American Library Association">ALA</acronym> Bill of Rights, libraries should not exclude materials <q>because of the origin, age, background, or views of those contributing to their creation</q>.</p>
Blockquotes
When a quote is longer, use <blockquote> and provide a citation if possible.
I learned this, at least, by my experiment: that if one advances confidently in the direction of his dreams, and endeavors to live the life which he has imagined, he will meet with a success unexpected in common hours.
<blockquote><p>I learned this, at least, by my experiment: that if one advances confidently in the direction of his dreams, and endeavors to live the life which he has imagined, he will meet with a success unexpected in common hours.</p><footer>— Henry David Thoreau, <cite>Walden: Or, Life in the Woods</cite></footer></blockquote>