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
content::RenderFrameHost* rfh,
    content::BrowserContext* browser_context,
    const GURL& url,
    bool has_request_started,
    content::SiteInstance* candidate_instance,
    content::SiteInstance** new_instance) {
  if (g_suppress_renderer_process_restart) {
    g_suppress_renderer_process_restart = false;
    return;
  }
  content::SiteInstance* current_instance = rfh->GetSiteInstance();
  if (!ShouldCreateNewSiteInstance(rfh, browser_context, current_instance, url))
    return;
  
  auto* web_contents = content::WebContents::FromRenderFrameHost(rfh);
  auto* web_preferences = WebContentsPreferences::From(web_contents);
  std::string affinity;
  if (web_preferences &&
      web_preferences->GetPreference("affinity", &affinity) &&
      !affinity.empty()) {
    affinity = base::ToLowerASCII(affinity);
    auto iter = site_per_affinities.find(affinity);
    GURL dest_site = content::SiteInstance::GetSiteForURL(browser_context, url);
    if (iter != site_per_affinities.end() &&