Untitled

dabblet.css

body {
	background: pink
}

.popup {
	position: relative;
	width: 200px;
	height: 150px;
	padding: 10px;
	background: #fff;
	background-clip: padding-box;	
	border: 5px solid rgba(0,0,0,0.6);	
}
.popup:after,
.popup:before {
	content: "";
	top: 15px;
	right: -17px;
	position: absolute;
	height: 24px;
	width: 24px;
	transform: rotate(45deg);
	background: linear-gradient(45deg, transparent 0, transparent 50%, rgba(0,0,0,0.6) 50%, rgba(0,0,0,0.6) 100%);
}
.popup:after {
	background: #fff;
	height: 24px;
	width: 24px;
	top: 15px;
	right: -10px;
	background: linear-gradient(45deg, transparent 0, transparent 50%, #fff 50%, #fff 100%);
}

dabblet.html

<div class="popup">
	контент
</div>

dabblet.js

// alert('Hello world!');

settings.json

{"view":"separate","fontsize":"70","seethrough":"","prefixfree":"1","page":"all"}