<!-- wp:paragraph -->
<p>block</p>
<!-- /wp:paragraph -->

<!-- wp:spacer -->
<div style="height:100px" aria-hidden="true" class="wp-block-spacer"></div>
<!-- /wp:spacer -->

<!-- wp:paragraph -->
<p>B </p>
<!-- /wp:paragraph -->

<!-- wp:paragraph -->
<p>A block</p>
<!-- /wp:paragraph -->