Function instrumentIframeWindow

3p/environment.js:133–142

* Installs a mutation observer in a window to look for iframes. * @param {!Element} node * @param {!Window} parent * @param {!Window} win

(node, parent, win)

 * @param {!Window} win
 */
function instrumentIframeWindow(node, parent, win) {
  if (win.ampSeen) {
    return;
  }
  const doc = win.document;
  instrumentDocWrite(parent, win);
  if (doc.body && doc.body.childNodes.length) {
    manageWin(win);
  }
}

/**
 * Installs a mutation observer in a window to look for iframes.