title: Bootstrap navbar collapse doesn't work
body: <p>I can't find the reason why, when trying to use the navbar button from Bootstrap, it doesn't work.</p>
  
  <p>I think it has something to do with my page loading the jQuery library or something, though I don't understand.</p>
  
  <p>Here is my code. I'll show just the head and navbar parts since I believe there's where the problem lives. Everything else is simple HTML structure:</p>
  
  <pre><code>&lt;!DOCTYPE html&gt;
  &lt;html lang="en"&gt;
  &lt;head&gt;
      &lt;meta charset="UTF-8"&gt;
      &lt;meta charset="UTF-8"&gt;
      &lt;meta name="viewport" content="initial-scale=1"&gt;
      &lt;!--Boostrap jQuery--&gt;
      &lt;script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js" integrity="sha384-Tc5IQib027qvyjsmfHjOMaLkfuWVxZxUPnCJA7l2mCWNIpG9mGCD8wGNIcPD7Txa"
          crossorigin="anonymous"&gt;&lt;/script&gt;
      &lt;!--Boostrap--&gt;
      &lt;link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u"
          crossorigin="anonymous"&gt;
      &lt;!--Favicon--&gt;
      &lt;link rel="icon" type="image/png" href="media/favicon-32x32.png" sizes="32x32" /&gt;
      &lt;!--Mi CSS--&gt;
      &lt;link rel="stylesheet" type="text/css" href="index.css"&gt;
  
      &lt;!-- p5.js--&gt;
      &lt;script src="https://cdnjs.cloudflare.com/ajax/libs/p5.js/0.5.2/p5.min.js"&gt;&lt;/script&gt;
      &lt;script src="js/sketch.js" type="text/javascript"&gt;&lt;/script&gt;
  
      &lt;title&gt;Festival Sonorum&lt;/title&gt;
  &lt;/head&gt;
  
  &lt;body&gt;
      &lt;!-- navbar --&gt;
      &lt;nav class="navbar navbar-default navbar-fixed-top"&gt;
          &lt;div class="container"&gt;
              &lt;div class="navbar-header"&gt;
                  &lt;button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar" aria-expanded="false"
                      aria-controls="navbar"&gt;
              &lt;span class="sr-only"&gt;Navegación&lt;/span&gt;
              &lt;span class="icon-bar"&gt;&lt;/span&gt;
              &lt;span class="icon-bar"&gt;&lt;/span&gt;
              &lt;span class="icon-bar"&gt;&lt;/span&gt;
            &lt;/button&gt;
                  &lt;a class="navbar-brand" href="index.html"&gt;Festival Sonorum&lt;/a&gt;
              &lt;/div&gt;
              &lt;div id="navbar" class="navbar-collapse collapse"&gt;
                  &lt;ul class="nav navbar-nav"&gt;
                      &lt;li&gt;&lt;a href="programa.html"&gt;Programa&lt;/a&gt;&lt;/li&gt;
                      &lt;li&gt;&lt;a href="#acerca"&gt;Acerca&lt;/a&gt;&lt;/li&gt;
                      &lt;li&gt;&lt;a href="#contacto"&gt;Contacto&lt;/a&gt;&lt;/li&gt;
                      &lt;li&gt;&lt;a href="#galeria"&gt;Galería&lt;/a&gt;&lt;/li&gt;
                      &lt;li class="dropdown"&gt;
                          &lt;a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false"&gt;Artistas &lt;span class="caret"&gt;&lt;/span&gt;&lt;/a&gt;
                          &lt;ul class="dropdown-menu"&gt;
                              &lt;li&gt;&lt;a href="#"&gt;Action&lt;/a&gt;&lt;/li&gt;
                              &lt;li&gt;&lt;a href="#"&gt;Another action&lt;/a&gt;&lt;/li&gt;
                              &lt;li&gt;&lt;a href="#"&gt;Something else here&lt;/a&gt;&lt;/li&gt;
                              &lt;li role="separator" class="divider"&gt;&lt;/li&gt;
                              &lt;li class="dropdown-header"&gt;Nav header&lt;/li&gt;
                              &lt;li&gt;&lt;a href="#"&gt;Separated link&lt;/a&gt;&lt;/li&gt;
                              &lt;li&gt;&lt;a href="#"&gt;One more separated link&lt;/a&gt;&lt;/li&gt;
                          &lt;/ul&gt;
                      &lt;/li&gt;
                  &lt;/ul&gt;
              &lt;/div&gt;
              &lt;!--/.nav-collapse --&gt;
          &lt;/div&gt;
      &lt;/nav&gt;
      &lt;!--fin del navbar--&gt;
  </code></pre>
  
  <p>Am I missing something? Like loading a library?</p>