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dabblet.css

section {
	float:left;
	}
.box {
	display:block;
	margin:0 10px 10px 0;
	width:100px;
	height:100px;
	overflow:hidden;
	border-radius:50%;
	}
	.element {
		display:block;
		width:100px;
		height:100px;
		border:none;
		background:#C00;
		}

dabblet.html

<section>
	<div class="box">
		<div class="element"></div>
	</div>
	<div class="box">
		<custom class="element"></custom>
	</div>
	<custom class="box">
		<div class="element"></div>
	</custom>
	<div class="box">
		<iframe src="" class="element"></iframe>
	</div>
	<div class="box">
		<img src="" class="element">
	</div>
</section>
<section>
	<div class="box element"></div>
	<custom class="box element"></custom>
	<div class="box element"></div>
	<iframe src="" class="box element"></iframe>
	<img src="" class="box element">
</section>

settings.json

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