curate.</p>
<p>At any given time, your application has one or more <em>active route
handlers</em>. The active handlers can change for one of two reasons:</p>
<ol>
<li>The user interacted with a view, which generated an event that caused
the URL to change.</li>
<li>The user changed the URL manually (e.g., via the back button), or the
page was loaded for the first time.</li>
</ol>
<p>When the current URL changes, the newly active route handlers may do one
or more of the following:</p>
<ol>
<li>Conditionally r