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
DCHECK_CURRENTLY_ON(BrowserThread::UI);
  if (!BrowserThread::IsThreadInitialized(BrowserThread::IO) ||
      !BrowserThread::PostTask(
          BrowserThread::IO, FROM_HERE,
          base::BindOnce(&SetApplicationLocaleOnIOThread, locale))) {
    g_io_thread_application_locale.Get() = locale;
  }
  *g_application_locale = locale;
}
AtomBrowserClient::AtomBrowserClient() {
  DCHECK(!g_browser_client);
  g_browser_client = this;
}
AtomBrowserClient::~AtomBrowserClient() {
  DCHECK(g_browser_client);
  g_browser_client = nullptr;
}
content::WebContents* AtomBrowserClient::GetWebContentsFromProcessID(
    int process_id) {
  
  
  if (base::ContainsKey(pending_processes_, process_id))
    return pending_processes_[process_id];
  
  
  return WebContentsPreferences::GetWebContentsFromProcessID(process_id);
}
bool AtomBrowserClient::ShouldCreateNewSiteInstance(