Function generateSentinel

src/3p-frame.js:408–414

(parentWindow)

 * @visibleForTesting
 */
export function generateSentinel(parentWindow) {
  let windowDepth = 0;
  for (let win = parentWindow; win && win != win.parent; win = win.parent) {
    windowDepth++;
  }
  return String(windowDepth) + '-' + getRandom(parentWindow);
}

/**
 * Resets the count of each 3p frame type