The first commented line is your dabblet’s title

dabblet.css

/**
 * The first commented line is your dabblet’s title
 */

body {
  text-align:center;
}

div {
  color:#eac;
  font-size:10em;
  
  animation:pound .25s infinite alternate;

}

@keyframes pound {
  to { transform: scale(1.5); }
}

dabblet.html

<div>&#x2665;</div>

dabblet.js

// alert('Hello world!');

settings.json

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