Add CSS Class to Heading

Select the heading with id="pageTitle" and add the CSS class "highlight" to it.

Platform-Provided HTML (READ-ONLY):
<div id="page">
  <h1 id="pageTitle">Welcome</h1>
</div>

Steps:
1. Use document.getElementById() to select the heading
2. Use classList.add() to add the "highlight" class

Expected Output:

<div id="page">
  <h1 id="pageTitle" class="highlight">Welcome</h1>
</div>

Topics:

HTML DOM

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