### 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
void MessageTo(bool internal,
                 int32_t web_contents_id,
                 const std::string& channel,
                 blink::CloneableMessage arguments);
  void MessageHost(const std::string& channel,
                   blink::CloneableMessage arguments,
                   content::RenderFrameHost* render_frame_host);
  void UpdateDraggableRegions(std::vector<mojom::DraggableRegionPtr> regions);
  void SetTemporaryZoomLevel(double level);
  void DoGetZoomLevel(
      electron::mojom::ElectronBrowser::DoGetZoomLevelCallback callback);
 private:
  
  WebContents(v8::Isolate* isolate, content::WebContents* web_contents);
  
  WebContents(v8::Isolate* isolate,
              std::unique_ptr<content::WebContents> web_contents,
              Type type);
  
  WebContents(v8::Isolate* isolate, const gin_helper::Dictionary& options);
  ~WebContents() override;
  
  
  void InitWithWebContents(content::WebContents* web_contents,
                           ElectronBrowserContext* browser_context,
                           bool is_guest);
  void InitWithSessionAndOptions(
      v8::Isolate* isolate,
      std::unique_ptr<content::WebContents> web_contents,
      gin::Handle<class Session> session,