dabblet.css

/**
 * Typing animation with pure CSS. 
 * Works best in browsers supporting the ch unit.
 */

@keyframes typing { from { width: 0; } }
@keyframes blink-caret { 50% { border-color: transparent; } }

h1 { 
	font: bold 200% Consolas, Monaco, monospace;
	border-right: .1em solid;
	width: 16.5em; /* fallback */
	width: 30ch; /* # of chars */
	margin: 2em 1em;
	white-space: nowrap;
	overflow: hidden;
	animation: typing 20s steps(30, end), /* # of steps = # of chars */
	           blink-caret .5s step-end infinite alternate;
}

dabblet.html

<h1>Typing animation by Lea Verou.</h1>

settings.json

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