What is 7H5

1, H5 HTML5 specifications including the flag, and to use e.g. CSS, JS (JavaScript), and other computer languages, and can achieve a variety of dynamic effect audio-visual effects, and will use a variety of functions to the rear end of the front end, mainly in the moving end propagation. H5 is the mobile end page. 
2, HTML5 specification requires that all user-defined properties to "data-" beginning