### Preflight Checklist

- [X] I have read the [Contributing Guidelines](https://github.com/electron/electron/blob/main/CONTRIBUTING.md) for this project.
- [X] I agree to follow the [Code of Conduct](https://github.com/electron/electron/blob/main/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 bug report that matches the one I want to file, without success.

### Electron Version

17.0.0

### What operating system are you using?

Windows

### Operating System Version

Windows 10 Version 21H1

### What arch are you using?

x64

### Last Known Working Electron version

14.2.3

### Expected Behavior

background should transparent if background is #00000000

### Actual Behavior

has a white background

### Testcase Gist URL

_No response_

### Additional Information

_No response_
shell/browser/api/electron_api_web_contents.cc
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 {
  if (!inspectable_ontents_)
    return nullptr;
  return inspectable_ontents_->GetDevToolsWebContents();
}
void WebContents::WebContentsDestroyed() {
   Clear the pointer stored in wrapper.
  if (GetAllWebContents().Lookup(id_))
    GetAllWebContents().Remove(id_);
  v8::Isolate* isolate = JavascriptEnvironment::GetIsolate();
  v8::HandleScope scope(isolate);