src/vs/workbench/contrib/webview/electron-browser/webviewService.ts/ElectronWebviewService/createWebviewElement
class ElectronWebviewService:	override createWebviewElement(
		id: string,
		options: WebviewOptions,
		contentOptions: WebviewContentOptions,
		extension: WebviewExtensionDescription | undefined,
	): WebviewElement {
		const useIframes = this._configService.getValue<string>('webview.experimental.useIframes') ?? !options.enableFindWidget;
		const webview = this._instantiationService.createInstance(useIframes ? ElectronIframeWebview : ElectronWebviewBasedWebview, id, options, contentOptions, extension, this._webviewThemeDataProvider);
		this.registerNewWebview(webview);
		return webview;
	}