### 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

14.0.0-beta.12

### What operating system are you using?

Windows

### Operating System Version

10.0.19042 Build 19042

### What arch are you using?

x64

### Last Known Working Electron version

13

### Expected Behavior

Window should be transparent

### Actual Behavior

Open a window with transparency enabled and delete the dom, the window will be white instead of transparent.
**Also seems like settings the backgroundColor property has no longer an effect.** I always see a white window

```
const {app, BrowserWindow} = require('electron')
const path = require("path");

function createWindow () {
	const mainWindow = new BrowserWindow({
		transparent: true,
		frame: false,
	})

	mainWindow.loadURL('https://example.com')
	mainWindow.webContents.openDevTools()
}

app.whenReady().then(createWindow)
```

### Testcase Gist URL

https://gist.github.com/e124340107f6c4a3ade8b36d98a16b9a

### Additional Information

_No response_
shell/browser/api/electron_api_web_contents.cc
ontents()->Redo();
}
void WebContents::Cut() {
  ontents()->Cut();
}
void WebContents::Copy() {
  ontents()->Copy();
}
void WebContents::Paste() {
  ontents()->Paste();
}
void WebContents::PasteAndMatchStyle() {
  ontents()->PasteAndMatchStyle();
}
void WebContents::Delete() {
  ontents()->Delete();
}
void WebContents::SelectAll() {
  ontents()->SelectAll();
}
void WebContents::Unselect() {
  ontents()->CollapseSelection();
}
void WebContents::Replace(const std::u16string& word) {
  ontents()->Replace(word);
}
void WebContents::ReplaceMisspelling(const std::u16string& word) {
  ontents()->ReplaceMisspelling(word);
}
uint32_t WebContents::FindInPage(gin::Arguments* args) {