Today our problem is we want to select all child elements except the first one using JavaScript. For example, we have the following code. 

<ol>
  <li>Home</li>
  <li>About</li>
  <li>Contact</li>
</ol>

Now, what we have to do is we have to select all li elements and add a class name child to both of them except the first li element. Like the following example.

Example : add class to li elements except the first. # 
<ol>
  <li>Home</li>
  <li class="child">About</li>
  <li class="child">Contact</li>
</ol>

We can use the :not() and :first-child selectors. E.g.

document.querySelectorAll("li:not(:first-child)");