<div id=container>
<h1>one</h1>
<h1>two</h1>
<h1 class="special">three</h1>
</div>
#container {
margin-left: 100px;
}
.special:before {
content: '[x]';
position: relative;
left: -30px;
}
#container {
margin-left: 100px;
}
.special {
position: relative;
}
.special:before {
content: '[x]';
position: absolute;
left: -30px;
}