9. <body>
<p>This is <b>bold text</b>.</p>
<p>This is <strong>strongly important text</strong>.</p>
<p>This is <i>italic text</i>.</p>
<p>This is <em>emphasized text</em>.</p>
<p>This is <mark>highlighted text</mark>.</p>
<p>This is code <code>var x = 10</code>.</p>
<p>This is <small>smaller text</small>.</p>
<p>H<sub>2</sub>O <br> x<sup>5</sup> </p>
<p>This is <del>deleted text</del><ins>inserted text</ins></p>
<hr>
<blockquote>
<p>Learn from yesterday, live for today, hope for tomorrow. The important thing is not to stop questioning.</p>
</blockquote>
<hr>
<p>According to the World Health Organization (WHO):
<q>Health is a state of complete physical, mental, and social well-being.</q>
</p>
</body>
