JavaScript JavaScript and the DOM Traversing the DOM Sibling Traversal

michael edmondson
michael edmondson
3,369 Points

where am i going wrong in my code?

The <ul> stored in the variable list has a click event listener that targets each <button> in the list. Complete the code to add a class of highlight to a <p> element that's an immediate previous sibling of the button being clicked.

did i have to add the highlight class in the index html? if not should i remove it? or is there anything else wrong with my code that im not seeing?

var list = document.getElementsByTagName('ul')[0];

list.addEventListener('click', function(e) {
  if ( == 'BUTTON') {
  if( == 'highlight'){
    let li =;
    let prevLi = li.previousElementSibling;
    let list = li.parentNode;
<!DOCTYPE html>
        <title>JavaScript and the DOM</title>
    <link rel="stylesheet" href="style.css" />
            <h1>Making a Webpage Interactive</h1>
            <p>Things to Learn</p>
                <li><p class = "hightlight">Element Selection</p><button>Highlight</button></li>
                <li><p class = "highlight">Events</p><button>Highlight</button></li>
                <li><p class = "highlight">Event Listening</p><button>Highlight</button></li>
                <li><p class = "highLight">DOM Traversal</p><button>Highlight</button></li>
        <script src="app.js"></script>
Steven Parker
Steven Parker
177,845 Points

This looks like a duplicate of your previous question. See the answers(s) posted there.

You can delete this duplicate while it has no answers. Click the little rectangle with the 3 dots to reveal the option.