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dabblet.css

div {
	height: 50px;
	width: 50px;
	border-radius: 50%;
	position: absolute;
	top: 200px;
	left: 400px;
	background: black;
}

div:before {
	position: absolute;
	width: 100%;
	height: 100%;
	content: '';
	background: red;
	animation: rotation 0.1s linear infinite;
	transform-origin: 50% -100px;
	top: 100px;
	border-radius: 50%;
}

@keyframes rotation {
	0% { tranform: rotate(0deg); }
	100% {transform: rotate(360deg); }
}

dabblet.html

<div></div>

dabblet.js

// alert('Hello world!');

settings.json

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