CSS technique for a horizontal line with words in the middle

This is roughly how I'd do it: the line is created by setting a border-bottom on the containing h2 then giving the h2 a smaller line-height. The text is then put in a nested span with a non-transparent background.

h2 {
   width: 100%; 
   text-align: center; 
   border-bottom: 1px solid #000; 
   line-height: 0.1em;
   margin: 10px 0 20px; 
} 

h2 span { 
    background:#fff; 
    padding:0 10px; 
}
<h2><span>THIS IS A TEST</span></h2>
<p>this is some content other</p>

I tested in Chrome only, but there's no reason it shouldn't work in other browsers.

JSFiddle: http://jsfiddle.net/7jGHS/


After trying different solutions, I have come with one valid for different text widths, any possible background and without adding extra markup.

h1 {
  overflow: hidden;
  text-align: center;
}

h1:before,
h1:after {
  background-color: #000;
  content: "";
  display: inline-block;
  height: 1px;
  position: relative;
  vertical-align: middle;
  width: 50%;
}

h1:before {
  right: 0.5em;
  margin-left: -50%;
}

h1:after {
  left: 0.5em;
  margin-right: -50%;
}
<h1>Heading</h1>
<h1>This is a longer heading</h1>

I tested it in IE8, IE9, Firefox and Chrome. You can check it here http://jsfiddle.net/Puigcerber/vLwDf/1/