//document.querySelectorAll('[amendment]').setAttribute('isclassified', false);
document.querySelectorAll('[amendment]').forEach(item => item.removeAttribute('activeamendment'));

//THEN
//document.querySelectorAll('[amendment="selectedamendmentid"]').forEach(item => setAttribute('activeamendment', true));
document.querySelectorAll('[amendment="HB819FDEA29674204ABD2698D5DEED62F"]').setAttribute('activeamendment', true);