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<html><body><select id="mySelect"></select><p>Click the button to create an OPTION element.</p><button onclick="myFunction()">Try it</button><p id="demo"></p><script>function myFunction() { var x = document.createElement("OPTION"); x.setAttribute("value", "volvocar"); var t = document.createTextNode("Volvo"); x.appendChild(t); document.getElementById("mySelect").appendChild(x);}</script></body></html>