var collection = document.getElementsByClassName("ig1"); for (let i = 0; i < collection.length; i++) { collection[i].innerHTML = '
'; } collection = document.getElementsByClassName("ig2"); for (let i = 0; i < collection.length; i++) { collection[i].innerHTML = '
'; } collection = document.getElementsByClassName("ig3"); for (let i = 0; i < collection.length; i++) { collection[i].innerHTML = '
'; }