<!DOCTYPE html>
<html>
<body>
<pre id="t1">
I have tabs inside!
</pre>
<p>Click the "Try it" button to cahnge the tab-size property of the PRE element</p>
<button onclick="myFunction()">Try it</button>
<script>
function myFunction() {
document.getElementById("t1").style.MozTabSize = "16"; // Code for Firefox
document.getElementById("t1").style.OTabSize = "16"; // Code for Opera 10.6-12.1
document.getElementById("t1").style.tabSize = "16";
}
</script>
<p><b>Note:</b> The tabSize property is supported in Chrome, Safari 6.1+ and Opera 15+.</p>
<p><b>Note:</b> Firefox supports an alternative, the MozTabSize property.</p>
<p><b>Note:</b> Opera 10.6-12.1 supports an alternative, the OTabSize property.</p>
</body>
</html>