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<html><body><form> <select id="mySelect" size="4"> <option>Apple</option> <option>Pear</option> <option>Banana</option> <option>Orange</option> </select></form><br><button onclick="myFunction()">Remove last option</button><script>function myFunction() { var x = document.getElementById("mySelect"); if (x.length > 0) { x.remove(x.length-1); }}</script></body></html>