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dabblet.css

@keyframes radar {
	0% { transform: rotate(0deg); }
	100% { transform: rotate(360deg); }
}
#wifi {
	width: 100px; height: 100px;
 	border: double 100px;
 	border-radius: 200px;
 	border-color: black transparent transparent;
 	animation: radar 3s linear infinite;
}
#wifi::before {
	content: '';
	display: block;
	width: 0; height: 0;
	border: solid 20px black;
	border-radius: 20px;
	position: relative;
	top: 30px; left: 30px;
}

dabblet.html

<div id=wifi></div>

settings.json

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