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document.addEventListener('DOMContentLoaded', function() { // Select the element with id input_7_3_6 var selectElement = document.getElementById('input_8_12_6'); // Loop through each option and remove those that aren't Canada, Mexico, United States, or have no values for (var i = 1; i < selectElement.options.length; i++) { var option = selectElement.options[i]; if ((option.value !== 'Canada' && option.value !== 'Mexico' && option.value !== 'United States')) { selectElement.remove(i); i--; // Since we removed an option, we need to decrement i to stay on the same index } } });