chaos-string-test.js

function walkDOMTree(
  root,
  whatToShow = NodeFilter.SHOW_ALL,
  { inspect, collect, callback } = {}
) {
  const walker = document.createTreeWalker(root, whatToShow, {
    acceptNode(node) {
      if (inspect && !inspect(node)) {
        return NodeFilter.FILTER_REJECT;
      }
      if (collect && !collect(node)) {
        return NodeFilter.FILTER_SKIP;
      }
      return NodeFilter.FILTER_ACCEPT;
    },
  });

  const nodes = [];
  let n;
  while ((n = walker.nextNode())) {
    callback?.(n);
    nodes.push(n);
  }

  return nodes;
}

const PARENT_TAGS_TO_EXCLUDE = ["STYLE", "SCRIPT", "TITLE"];

function getAllTextNodes(el) {
  return walkDOMTree(el, NodeFilter.SHOW_TEXT, {
    inspect: (textNode) =>
      !PARENT_TAGS_TO_EXCLUDE.includes(textNode.parentElement?.nodeName),
  });
}

function generateRandomString(length) {
  var result = "";
  var characters =
    "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
  var charactersLength = characters.length;
  for (var i = 0; i < length; i++) {
    result += characters.charAt(Math.floor(Math.random() * charactersLength));
  }
  return result;
}

const textNodes = getAllTextNodes(document.body);

textNodes.forEach((node) => {
  const textNodeLength = node.textContent.length;
  node.textContent = generateRandomString(textNodeLength * 3);
});