ent</p>
    </div>
    <div id="details">
    <h2>Details</h2>
    <p>The button hides if you are on very top of the page. If you scroll
down 50px, this button will appear.</p>
    </div>

    <div id="ref-examples">
    <h2>Examples</h2>
    <div class="sourceCode"><pre class="sourceCode r"><code><span class="r-in"><span><span class="kw">if</span><span class="op">(</span><span class="fu"><a href="https://rdrr.io/r/base/interactive.html" class="external-link">interactive</a></span><span class="op">(</span><