The first commented line is your dabblet’s title

dabblet.css

/**
 * The first commented line is your dabblet’s title
 */
body {
background: #f06;
background: linear-gradient(45deg, #f06, yellow);
min-height: 100%;
}

.test {
   height: 30px;
   border: 1px solid #000;
   border-radius: 0;
   background: #FF0;
   width:100%;
}

dabblet.html

<div>
<p>select multi</p>
<select class="test" multiple>
   <option value="1">value1</option>
   <option value="2">value2</option>
   <option value="3">value3</option>
   <option value="4">value4</option>
</select>

<p>select</p>
<select class="test">
<option value="1">value1</option>   <option value="2">value2</option>   <option value="3">value3</option>   <option value="4">value4</option></select>
</div>

dabblet.js

// alert('Hello world!');

settings.json

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