js

const treeWalker = document.createTreeWalker(
  document.body,
  NodeFilter.SHOW_ELEMENT + NodeFilter.SHOW_COMMENT + NodeFilter.SHOW_TEXT,
  { acceptNode: (node) => NodeFilter.FILTER_ACCEPT },
  false,
);
if (
  treeWalker.whatToShow === NodeFilter.SHOW_ALL ||
  treeWalker.whatToShow % (NodeFilter.SHOW_COMMENT * 2) >=
    NodeFilter.SHOW_COMMENT
) {
  // treeWalker will show comments
}