### 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

16.0.0

### What operating system are you using?

Windows

### Operating System Version

WIN10 20H2

### What arch are you using?

x64

### Last Known Working Electron version

_No response_

### Expected Behavior

 win.webContents.savePage('d:/aaaaaa.html', 'HTMLComplete').then(() => {
      console.log('Page was saved successfully.')
    }).catch(err => {
      console.log(err)
    })

it will generate a html page file at d: 

### Actual Behavior

savePage has three formats that can be used

if use HTMLComplete
 only produced a aaaaaa_files empty folder

if use HTMLonly 
No files are generated nor error callbacks are generated

MHTML option works fine

### Testcase Gist URL

_No response_

### Additional Information

_No response_
shell/browser/api/electron_api_web_contents.cc
content::RenderFrameHost* requesting_frame,
    const blink::mojom::FullscreenOptions& options,
    bool allowed) {
  if (!allowed || !owner_window_)
    return;
  auto* source = content::WebContents::FromRenderFrameHost(requesting_frame);
  if (IsFullscreenForTabOrPending(source)) {
    DCHECK_EQ(fullscreen_frame_, source->GetFocusedFrame());
    return;
  }
  SetHtmlApiFullscreen(true);
  if (native_fullscreen_) {
    
    
    source->GetRenderViewHost()->GetWidget()->SynchronizeVisualProperties();
  }
}
void WebContents::ExitFullscreenModeForTab(content::WebContents* source) {