What is html5? Introduction to html5 and summary of its advantages and disadvantages

HTML5 is the fifth revision to the HTML standard. The main goal is to semanticize the Internet so that it is better readable by humans and machines, and at the same time provide better support for embedding of various media. Let's take a brief look at html5.

1. Definition: What is html5?

HTML5 is the result of the cooperation between W3C and WHATWG. HTML5 will become the new standard for HTML, XHTML and HTML DOM. (In short, html5 is version 5.0 of html)

2. What are the rules for html5?

New features should be based on HTML, CSS, DOM and JavaScript.

Reduce the need for external plug-ins (such as Flash)

Better error handling

More tags that replace scripts

HTML5 should be device independent

The development process should be transparent to the public

3.Advantages and disadvantages of html5

Advantages: a. Unified network standards, HTML5 itself is recommended by W3C.

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d. Improve usability and improve user-friendly experience;

e. There are several new tags, which will help developers define important content;

f. It can bring more multimedia elements (video and audio) to the site;

g. It can be a good substitute for Flash and Silverlight;

h. It involves website crawling and When indexing, it is very friendly to SEO;

i. It is widely used in mobile applications and games.

Disadvantages: a. Security: There are serious security issues in the previous implementation of web socket and transparent proxy in Firefox 4. At the same time, functions such as web storage and web socket are easily exploited by hackers to steal. User information and data.

b. Completeness: Many features are supported by different browsers.

c. Technical threshold: While HTML5 simplifies the work of developers, it also means that there are many new attributes and APIs that developers need to learn, such as web workers, web sockets, web storage and other new features, background and even browser principles. knowledge, opportunities but also huge challenges

d. Performance: Engine problems on some platforms lead to low performance of HTML5.

e. Browser compatibility: The biggest shortcoming is that browsers below IE9 are almost completely wiped out.

4. The reasons why flash is gradually being replaced by html5

(1) Disadvantages of Flash

Before the Flash security vulnerability was too big, the network speed was slow. Using Flash compression technology can speed up the video The text in the loaded Flash cannot be recognized by search engines, and the SEO effect is relatively poor. The core animation needs to be produced by professionals. It is more troublesome to modify and takes up a lot of CPU resources. When the page contains Flash animation, the page response is slow, Apple's latest support is provided, resulting in Usage plummets, Flash needs to be updated manually and needs to be installed

(2) Advantages of html5

Recommended by W3C, it has unified network standards, cross-platform, multi-device support, SEO-friendliness, and use of search engines to crawl Retrieval and search are convenient for game development. Better interactivity. Direct support for audio and video. Simpler, more concise and clearer code. Convenient storage and timely update features.

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