Function focusable

src/helpers/tabbable.js:63–69

(element, isTabIndexNotNaN)

}

function focusable(element, isTabIndexNotNaN) {
  const nodeName = element.nodeName.toLowerCase();
  const res =
    (tabbableNode.test(nodeName) && !element.disabled) ||
    (nodeName === "a" ? element.href || isTabIndexNotNaN : isTabIndexNotNaN);
  return res && visible(element);
}

function tabbable(element) {
  let tabIndex = element.getAttribute("tabindex");