### 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
class InspectableWebContents;
class WebContentsZoomController;
class WebViewGuestDelegate;
class FrameSubscriber;
class WebDialogHelper;
class NativeWindow;
#if BUILDFLAG(ENABLE_OSR)
class OffScreenRenderWidgetHostView;
class OffScreenWebContentsView;
#endif
namespace api {
class WebContents : public gin::Wrappable<WebContents>,
                    public gin_helper::EventEmitterMixin<WebContents>,
                    public gin_helper::Constructible<WebContents>,
                    public gin_helper::CleanedUpAtExit,
                    public content::WebContentsObserver,
                    public content::WebContentsDelegate,
                    public InspectableWebContentsDelegate,
                    public InspectableWebContentsViewDelegate {
 public:
  enum class Type {
    kBackgroundPage,  
    kBrowserWindow,   
    kBrowserView,     
    kRemote,          
    kWebView,         
    kOffScreen,       
  };
  
  static gin::Handle<WebContents> New(v8::Isolate* isolate,