What are the advantages and disadvantages of html5?

Advantages: A, the network standard is unified, and HTML5 itself is recommended by W3C.

B, multi-equipment, cross-platform

C, instant update to improve usability and humanized experience;

D, there are several new tags that will help developers define important content;

E, it can bring more multimedia elements (video and audio) to the site, which can be a good substitute for Flash and Silverlight；;

F, speaking of crawling and indexing websites, it is very friendly to SEO;

Disadvantages: A. Security: There are serious security problems in the implementation of web socket and transparent proxy in Firefox4. web storage, web socket and other functions are easily used by hackers to steal users' information and materials.

B. Perfect: Different browsers support many functions.

C. technical threshold: html5 simplifies the work of developers and represents many new attributes and APIs that developers need to learn. New features such as web worker, web socket, web storage, etc. require a certain understanding of background technology, and even a deep understanding of the principles and logic behind it. Canvas needs some knowledge of vision and image algorithms, while traditional front-end developers need to master more knowledge of algorithms, vision, background and even browser principles, which is also a great challenge.

D. performance: engine problems in some platforms lead to low performance of html5. At the same time, html5 can handle complex audio and video without GPU (graphics processor) acceleration, and the animation performance is not satisfactory.

E. Browser compatibility: The biggest disadvantage is that browsers below IE9 are almost completely annihilated.