src/vs/workbench/contrib/webview/browser/webviewService.ts/WebviewService/createWebviewElement
class WebviewService:	createWebviewElement(initInfo: WebviewInitInfo): IWebviewElement {
		const webview = this._instantiationService.createInstance(WebviewElement, initInfo, this._webviewThemeDataProvider);
		this.registerNewWebview(webview);
		return webview;
	}