Function visible

src/helpers/tabbable.js:47–61

(element)

}

function visible(element) {
  let parentElement = element;
  let rootNode = element.getRootNode && element.getRootNode();
  while (parentElement) {
    if (parentElement === document.body) break;

    // if we are not hidden yet, skip to checking outside the Web Component
    if (rootNode && parentElement === rootNode)
      parentElement = rootNode.host.parentNode;

    if (hidesContents(parentElement)) return false;
    parentElement = parentElement.parentNode;
  }
  return true;
}

function focusable(element, isTabIndexNotNaN) {
  const nodeName = element.nodeName.toLowerCase();