<!DOCTYPE html>
<html lang="en">
<header>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>JS Documentation</title>
<link rel="stylesheet" href="styles.css">
</header>
<body>
<main id="main-doc">
<section class="main-section" id="introduction">
<header>
<h1>Introduction</h1>
</header>
<div>
<p></p>
</div>
</section>
<section class="main-section" id="what_you_should_already_know">
<header>
<h1>What you should already know</h1>
</header>
<div>
<p></p>
</div>
</section>
<section class="main-section" id="javascript_and_java">
<header>
<h1>Javascript and Java</h1>
</header>
<div>
<p></p>
</div>
</section>
<section class="main-section" id="hello_world">
<header>
<h1>Hello World</h1>
</header>
<div>
<p></p>
</div>
</section>
<section class="main-section" id="reference">
<header>
<h1>Reference</h1>
</header>
<div>
<p></p>
</div>
</section>
</main>
</body>
</html>
I was writing a technical documentation page for my assessment but it is saying the header elements are empty. Please what am I doing wrong