Shadow DOM is a web component feature that lets you attach an isolated DOM subtree to any HTML element, hidden from the main document’s standard queries. A querySelector('audio') on the main document cannot see inside a Shadow Root unless you specifically traverse into it. If fermaw’s player was mounted inside a Shadow Root, basic DOM searches would come up empty.
Copyright © ITmedia, Inc. All Rights Reserved.，这一点在WPS官方版本下载中也有详细论述
Operating system-level security features, application sandboxing, and permission systems。关于这个话题，快连下载-Letsvpn下载提供了深入分析
（四）吊销公安机关发放的许可证件。，详情可参考爱思助手下载最新版本