HTML5扩展出互动、云端服务集成等新的能力,为Web从内容呈现工具向功能更加丰富的应用平台转换提供了可能,适合在云计算下应用的Web操作系统的出现,对推动计算机技术发展具有重要意义。在此背景下,本文针对基于HTML5的前端效率机制及Web应用模式两方面展开研究,为Web操作系统的优化提供参考。前言HTML5在研发的过程中,既对原有的HTML系列功能进行了沿袭又进行了变革,例如取消了部分过时的HTML4标记、对 HTML5 extends new capabilities such as interactivity and cloud service integration to provide the possibility for Web to change from content presentation tools to more feature-rich application platforms and to adapt to the emergence of Web operating systems that are applied under cloud computing and to promote the development of computer technology Significance. In this context, this paper studies the HTML5-based front-end efficiency mechanism and Web application mode, and provides a reference for the optimization of Web operating system. Introduction HTML5 in the development process, both the original HTML family of features have followed and changed, such as the cancellation of some obsolete HTML4 markup,