margin collapse

dabblet.css

/**
 * margin collapse
 */
ul {
  background: red;
  clear: both;
  //overflow: hidden;
  //border: 1px solid;
}
ul li{
  list-style-type: none;
  width: 40px;
  height: 20px;
  background-color: green;
  margin: 20px;
}
ul li:last-child {
  margin-top: 40px;
}

dabblet.html

<ul>
  <li>2</li>
  <li>d</li>
  <li>d</li>
</ul>

dabblet.js

// alert('Hello world!');

settings.json

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