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<html><body><h1>Change tab-size with JavaScript</h1><pre id="t1">I have tabs inside!</pre><p>Click the "Try it" button to change the tab-size property of the PRE element</p><button onclick="myFunction()">Try it</button><script>function myFunction() { document.getElementById("t1").style.MozTabSize = "16"; // Firefox document.getElementById("t1").style.tabSize = "16";}</script><p><strong>Note:</strong> Firefox supports an alternative, the MozTabSize property.</p></body></html>