### 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.h
return inspectable_web_contents_.get();
  }
  NativeWindow* owner_window() const { return owner_window_.get(); }
  bool is_html_fullscreen() const { return html_fullscreen_; }
  void set_fullscreen_frame(content::RenderFrameHost* rfh) {
    fullscreen_frame_ = rfh;
  }
  
  void Message(bool internal,
               const std::string& channel,
               blink::CloneableMessage arguments,
               content::RenderFrameHost* render_frame_host);
  void Invoke(bool internal,
              const std::string& channel,
              blink::CloneableMessage arguments,
              electron::mojom::ElectronBrowser::InvokeCallback callback,
              content::RenderFrameHost* render_frame_host);
  void OnFirstNonEmptyLayout(content::RenderFrameHost* render_frame_host);
  void ReceivePostMessage(const std::string& channel,
                          blink::TransferableMessage message,
                          content::RenderFrameHost* render_frame_host);
  void MessageSync(
      bool internal,
      const std::string& channel,
      blink::CloneableMessage arguments,
      electron::mojom::ElectronBrowser::MessageSyncCallback callback,
      content::RenderFrameHost* render_frame_host);