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
IsSameWebSite(browser_context, iter->second->GetSiteURL(), dest_site)) {
      *new_instance = iter->second;
    } else {
      site_per_affinities[affinity] = candidate_instance;
      *new_instance = candidate_instance;
      
      auto* pending_process = candidate_instance->GetProcess();
      pending_processes_[pending_process->GetID()] = web_contents;
    }
  } else {
    
    
    
    
    
    
    
    
    
    if (has_request_started) {
      *new_instance = current_instance;
      return;
    }
    *new_instance = candidate_instance;
    
    auto* pending_process = candidate_instance->GetProcess();
    pending_processes_[pending_process->GetID()] = web_contents;
  }
}
void AtomBrowserClient::AppendExtraCommandLineSwitches(