Beveled corners — with border-image and an inline SVG

dabblet.css

/**
 * Beveled corners — with border-image and an inline SVG
 */

div {
	border: 21px solid transparent;
	border-image: 1 url('data:image/svg+xml,\
	                      <svg xmlns="http://www.w3.org/2000/svg" width="3" height="3" fill="%2358a">\
	                      <polygon points="0,1 1,0 2,0 3,1 3,2 2,3 1,3 0,2" />\
	                      </svg>');
	background: #58a;
	background-clip: padding-box;
	
	padding: .2em .3em;
	max-width: 12em;
	color: white;
	font: 150%/1.6 Baskerville, Palatino, serif;
}

dabblet.html

<div>Hey, focus! You’re supposed to be looking at my corners, not reading my text. The text is just placeholder!</div>

dabblet.js

// alert('Hello world!');

settings.json

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