<article>
is a block-level element
</article>
<body>
is a block-level element<h1>
is a block-level element</h1>
<h2>
is a block-level element</h2>
<h3>
is a block-level element</h3>
<h4>
is a block-level element</h4>
<h5>
is a block-level element</h5>
<h6>
is a block-level element</h6>
<p>
is a block-level element</p>
<div>
is a block-level element</div>
<header>
is a block-level element </header>
<main>
is a block-level element
<section>
is a block-level element
<article>
is a block-level element
</article>
</section>
</main>