The first commented line is your dabblet’s title

dabblet.css

/**
 * The first commented line is your dabblet’s title
 */
html   {
background: #f06;
background: linear-gradient(340deg, #f06, yellow);
height: 100%;
}
body {height:100%;display:table;width:800px;border-collapse:collapse;margin:0 auto;
box-shadow:0 0 5px
}
body > section , body > footer, body > header{display:table-row;}
body > section >div  , body > footer > div , body > header > div {display:table-cell;text-align:center;
 background-image:linear-gradient(90deg,transparent 0%, rgba(255,255,255,0.05) 40%, transparent 100%),
 linear-gradient(0deg,transparent 0%, rgba(255,255,255,0.05) 40%, transparent 100%);
 height:1%;
 background-color:#468;
}
.vh {vertical-align:top;}
.vm {vertical-align:middle;}
.vb {vertical-align:bottom;}

dabblet.html

<header>
	<div class="vh">
		<h1>HTML Ipsum Presents</h1>
	</div>
</header>
<section>
	<div class="vm">  
		<!--	
		<p><strong>Pellentesque habitant morbi tristique</strong> senectus et netus et malesuada fames ac turpis egestas. Vestibulum tortor quam, feugiat vitae,ultricies eget, tempor sit amet, ante. Donec eu libero sit amet quam egestas  semper. <em>Aenean ultricies mi vitae est</em> Mauris placerat eleifend leo. Quisque sit amet est et sapien ullamcorper pharetra. Vestibulum erat wisi, condimentum sed, <code>commodo vitae</code>, ornare sit amet, wisi. Aenean 	 fermentum, elit eget tincidunt condimentum, eros ipsum rutrum orci, sagittis 	 tempus lacus enim ac dui. <a href="#">Donec non enim</a> in turpis pulvinar 	 facilisis. Ut felis.</p>
		-->
		<h2>Header Level 2</h2>
		 <!--     
		<ol>   <li>Lorem ipsum dolor sit amet, consectetuer adipiscing elit.</li>   <li>Aliquam tincidunt mauris eu risus.</li></ol><blockquote><p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vivamus magna. Cras in mi at felis aliquet congue. Ut a est eget ligula molestie gravida. Curabitur massa. Donec eleifend, libero at sagittis mollis, tellus est malesuada tellus, at luctus turpis elit sit amet quam. Vivamus pretium ornare est.</p></blockquote>
		-->
	</div>
</section>
<footer>
	<div class="vb">
		<h3>Header Level 3</h3>
		<!--
		<ul>   <li>Lorem ipsum dolor sit amet, consectetuer adipiscing elit.</li>   <li>Aliquam tincidunt mauris eu risus.</li></ul>
		-->
	</div>
</footer>

dabblet.js

// alert('Hello world!');

settings.json

{"view":"split-vertical","fontsize":"100","seethrough":"","prefixfree":"1","page":"html"}