Ulprus

/********** THIS SECTION INCLUDES FIXES FOR WOOCOMMERCE 8.4.0 **********/

/* Add Checkmark on ATC Button After Added */
.woocommerce #respond input#submit.added::after, .woocommerce a.button.added::after, .woocommerce button.button.added::after, .woocommerce input.button.added::after {
    font-family: WooCommerce;
    content: "\e017";
    margin-left: 0.53em;
    vertical-align: bottom;
}

Ulprus

//run a function and set the attributes on the Oxygen element
//make another function which removes the active tab and hides its content, then add the active tab
//and reveal content for the desired tab:

function buttonA() {

  // remove "tabB" active tab class and add oxygen hidden class to that content
  var tabB = document.getElementById("_tab-647-534");
  tabB.classList.remove("tabs-1874-tab-active");