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<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.tabSize = "16";}</script><p><b>Note:</b> The tabSize property is not supported in Firefox. However, an alternative is supported: the MozTabSize property.</p></body></html>