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JavaScript JavaScript and the DOM (Retiring) Getting a Handle on the DOM Practice Selecting Elements

Willie Suggs
PLUS
Willie Suggs
Courses Plus Student 5,879 Points
Posted by Willie Suggs
Willie Suggs
Courses Plus Student 5,879 Points

why wont this exercise let me add classes?

there are 5 li elements in my html document, 3 of which are nested within a ul in my nav element. One of those li has a class of .selected. My task is to store only the 3 li elements that are in my nav into a javascript variable. My issue is this, I can't add anything to my html, if I could I would simply add the same class to the desired li elements and use getElementsByClassName or querySelectorAll to grab them.

js/app.js 
let navigationLinks = document.querySelector('nav.selected ');
navigationLinks += document.querySelector('[herf=about.html] ');
navigationLinks += document.querySelector('[herf=contact.html] ');
let galleryLinks;
let footerImages;
index.html 
<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>Nick Pettit | Designer</title>
    <link rel="stylesheet" href="css/normalize.css">
    <link href='http://fonts.googleapis.com/css?family=Changa+One|Open+Sans:400italic,700italic,400,700,800' rel='stylesheet' type='text/css'>
    <link rel="stylesheet" href="css/main.css">
    <link rel="stylesheet" href="css/responsive.css">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
  </head>
  <body>
    <header>
      <a href="index.html" id="logo">
        <h1>Nick Pettit</h1>
        <h2>Designer</h2>
      </a>
      <nav>
        <ul>
          <li><a href="index.html" class='selected'>Portfolio</a></li>
          <li><a href="about.html" >About</a></li>
          <li><a href="contact.html" >Contact</a></li>
        </ul>
      </nav>
    </header>
    <div id="wrapper">
      <section>
        <ul id="gallery">
          <li>
            <a href="img/numbers-01.jpg">
              <img src="img/numbers-01.jpg" alt="">
              <p>Experimentation with color and texture.</p>
            </a>
          </li>
          <li>
            <a href="img/numbers-02.jpg">
              <img src="img/numbers-02.jpg" alt="">
              <p>Playing with blending modes in Photoshop.</p>
            </a>
          </li>
        </ul>
      </section>
      <footer>
        <a href="http://twitter.com/nickrp"><img src="img/twitter-wrap.png" alt="Twitter Logo" class="social-icon"></a>
        <a href="http://facebook.com/nickpettit"><img src="img/facebook-wrap.png" alt="Facebook Logo" class="social-icon"></a>
        <p>&copy; 2016 Nick Pettit.</p>
      </footer>
    </div>
  <script src="js/app.js"></script>
  </body>
</html>