electron/spec/fixtures/module/preload-pdf-loaded-in-nested-subframe.js

const { ipcRenderer } = require('electron');

document.addEventListener('DOMContentLoaded', (event) => {
  const outerFrame = document.querySelector('#outer-frame');
  if (outerFrame) {
    outerFrame.onload = function () {
      const pdframe = outerFrame.contentWindow.document.getElementById('pdf-frame');
      if (pdframe) {
        pdframe.contentWindow.addEventListener('pdf-loaded', (event) => {
          ipcRenderer.send('pdf-loaded', event.detail);
        });
      }
    };
  }
});