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<html><body><select size="6"> <option value="BMW">BMW</option> <option value="Mercedes">Mercedes</option> <optgroup id="myOptgroup" label="Swedish Cars"> <option value="volvo">Volvo</option> <option value="saab">Saab</option> <option value="koenigsegg">Koenigsegg</option> </optgroup></select><p>Click the button to change the value of the label attribute of the option-group.</p><button onclick="myFunction()">Try it</button><script>function myFunction() { document.getElementById("myOptgroup").label = "A Random Car Selection";}</script></body><!-- Mirrored from www.w3schools.com/jsref/tryit.asp?filename=tryjsref_optgroup_label2 by HTTrack Website Copier/3.x [XR&CO'2014], Wed, 21 Dec 2022 18:16:59 GMT --></html>