Chrome has default font fallbacks set up on a per-script, per-OS basis. See for example https://chromium.googlesource.com/chromium/src/+/master/chrome/app/resources/locale_settings_mac.grd#160, which is the default font for characters in the Japanese-language script.

Electron does not set up these font fallbacks, and as a result, font rendering in those scripts does not match that of Chrome. Further, it's impossible to set it up on the app side to use the appropriate font fallbacks, because of #15480.
atom/browser/atom_browser_client.cc
command_line->AppendSwitchASCII(switches::kRegisterServiceWorkerSchemes,
                                    *g_custom_service_worker_schemes);
#if defined(OS_WIN)
  
  PWSTR current_app_id;
  if (SUCCEEDED(GetCurrentProcessExplicitAppUserModelID(&current_app_id))) {
    command_line->AppendSwitchNative(switches::kAppUserModelId, current_app_id);
    CoTaskMemFree(current_app_id);
  }
#endif
  if (delegate_) {
    auto app_path = static_cast<api::App*>(delegate_)->GetAppPath();
    command_line->AppendSwitchPath(switches::kAppPath, app_path);
  }
  content::WebContents* web_contents = GetWebContentsFromProcessID(process_id);
  if (web_contents) {
    auto* web_preferences = WebContentsPreferences::From(web_contents);
    if (web_preferences)
      web_preferences->AppendCommandLineSwitches(command_line);
    SessionPreferences::AppendExtraCommandLineSwitches(
        web_contents->GetBrowserContext(), command_line);
  }
}
void AtomBrowserClient::DidCreatePpapiPlugin(content::BrowserPpapiHost* host) {
#if BUILDFLAG(ENABLE_PEPPER_FLASH)
  host->GetPpapiHost()->AddHostFactoryFilter(
      base::WrapUnique(new ChromeBrowserPepperHostFactory(host)));
#endif
}
std::string AtomBrowserClient::GetGeolocationApiKey() {