src/vs/workbench/contrib/webview/electron-sandbox/webviewCommands.ts/OpenWebviewDeveloperToolsAction/run
class OpenWebviewDeveloperToolsAction:	async run(accessor: ServicesAccessor): Promise<void> {
		const nativeHostService = accessor.get(INativeHostService);

		const iframeWebviewElements = document.querySelectorAll('iframe.webview.ready');
		if (iframeWebviewElements.length) {
			console.info(nls.localize('iframeWebviewAlert', "Using standard dev tools to debug iframe based webview"));
			nativeHostService.openDevTools();
		}
	}