JavaScript function to remove elements with duplicated IDs

removeElementsWithDuplicatedIds.js

function removeElementsWithDuplicatedIds(id) {
    var ids = document.querySelectorAll('#' + id), // Get a collection of elements with same id
        len = ids.length,
        n;
    
    if (len < 2) {return;} // Quit. No duplicated ids

    for (n = 1; n < len; n++) { // Iterate through the collection
        if (ids[n]) { // Check if the element exists
            ids[n].parentElement.removeChild(ids[n]); // If the wanted id is found, remove the child
        }
    }
}