### 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.

### Electron Version

12.0.5

### What operating system are you using?

macOS

### Operating System Version

11.2.3

### What arch are you using?

arm64 (including Apple Silicon)

### Last Known Working Electron version

_No response_

### Expected Behavior

`document.hasFocus()` is only `true` for the window that has focus.

### Actual Behavior

Ever window reports `document.hasFocus()` to be `true` right after opening.

### Testcase Gist URL

https://gist.github.com/16e6fc829febd0cab115dfd0850a31be

### Additional Information

_No response_
shell/browser/api/electron_api_web_contents.cc
SetOwnerWindow(GetWebContents(), owner_window);
}
void WebContents::SetOwnerWindow(content::WebContents* ontents,
                                 NativeWindow* owner_window) {
  if (owner_window) {
    owner_window_ = owner_window->GetWeakPtr();
    NativeWindowRelay::CreateForWebContents(ontents,
                                            owner_window->GetWeakPtr());
  } else {
    owner_window_ = nullptr;
    ontents->RemoveUserData(NativeWindowRelay::UserDataKey());
  }
#if BUILDFLAG(ENABLE_OSR)
  auto* osr_wcv = GetOffScreenWebContentsView();
  if (osr_wcv)
    osr_wcv->SetNativeWindow(owner_window);
#endif
}
content::WebConbContents::GetWebContents() const {
  if (!inspectable_ontents_)
    return nullptr;
  return inspectable_ontents_->GetWebContents();
}
content::WebConbContents::GetDevToolsWebContents() const {