### Preflight Checklist

- [X] I have read the [Contributing Guidelines](https://github.com/electron/electron/blob/master/CONTRIBUTING.md) for this project.
- [X] I agree to follow the [Code of Conduct](https://github.com/electron/electron/blob/master/CODE_OF_CONDUCT.md) that this project adheres to.
- [X] I have searched the [issue tracker](https://www.github.com/electron/electron/issues) for a feature request that matches the one I want to file, without success.

### Problem Description

We need to load a custom error page when the certificate is invalid but without "isMainFrame" property we don't know when to load the custom error page using webContents.loadURL()

### Proposed Solution

webContents.on("certificate-error", ((event, url, error, certificate, callback, isMainFrame)

### Alternatives Considered

Not sure

### Additional Information

Not sure
shell/browser/api/electron_api_app.cc
auto* ax_state = content::BrowserAccessibilityState::GetInstance();
  return ax_state->IsAccessibleBrowser();
}
void App::SetAccessibilitySupportEnabled(gin_helper::ErrorThrower thrower,
                                         bool enabled) {
  if (!Browser::Get()->is_ready()) {
    thrower.ThrowError(
        "app.setAccessibilitySupportEnabled() can only be called "
        "after app is ready");
    return;
  }
  auto* ax_state = content::BrowserAccessibilityState::GetInstance();
  if (enabled) {
    ax_state->OnScreenReaderDetected();
  } else {
    ax_state->DisableAccessibility();
  }
  Browser::Get()->OnAccessibilitySupportChanged();
}
Browser::LoginItemSettings App::GetLoginItemSettings(gin::Arguments* args) {