What does 5 in html5 mean?

The 5 in html5 refers to the fifth edition; html5 is the fifth edition of HTML; in this version, many new features have been added to support web application developers, as well as more in line with developers' usage habits. new elements, with a focus on clearly defined, consistent guidelines to ensure interoperability of web applications and content across different user agents.

The operating environment of this tutorial: Windows 7 system, HTML5 version, Dell G3 computer.

On October 28, 2014, the World Wide Web Consortium (W3C) announced the release of the official recommendation standard for HTML5 (W3C Recommendation). HTML5 is the core language of the World Wide Web - version 5 of the Extensible Markup Language. In this version, many new features have been added to support web application developers, as well as new elements that are more in line with developers' usage habits, and focus on defining clear and consistent guidelines to ensure that web applications and content can be used in different user agents. Interoperability in (browsers).

HTML5 is a language description method for constructing web content. HTML5 is the next generation standard of the Internet and a language method for constructing and presenting Internet content. It is considered to be one of the core technologies of the Internet.

New features

HTML5 brings the Web into a mature application platform, on which video, audio, images, animations and Interactions with the device are regulated.

Smart Form

The form is the main component that realizes the interaction between the user and the page background. HTML5 is more powerful in form design. The diversity of input types and attributes has greatly enhanced the form forms that can be expressed in HTML. Coupled with some newly added form tags, controls that originally required JavaScript to be implemented can be implemented directly using HTML5 forms; some such as content prompts , focus processing, data validation and other functions can also be completed through HTML5’s smart form attribute tags.

Drawing Canvas

The canvas element of HTML5 can implement the canvas function. This element uses JavaScript scripting language to draw graphics and process on the web page through its own API. It has Implement methods to draw lines, arcs, and rectangles, fill areas with styles and colors, write stylized text, and add images, and every pixel can be controlled using JavaScript. The canvas element of HTML5 allows the browser to directly display graphics or animated images without plug-ins such as Flash or Silverlight.

Multimedia

One of the biggest features of HTML5 is its support for audio and video. By adding two tags,

Geographic Positioning

Mobile networks are now very popular. Users are increasingly applying real-time positioning and their requirements are getting higher and higher. By introducing the Geolocation API, HTML5 can realize the user's positioning function through GPS or network information, making positioning more accurate and flexible. Through HTML5 positioning, in addition to positioning your own position, you can also obtain other people's positioning information when they open their information to you.

Data Storage

HTML5 has its own storage method compared to traditional data storage, allowing larger-scale data storage on the client side. In order to meet different needs, HTML5 supports two storage mechanisms: DOM Storage and Web SQL Database. Among them, DOM Storage is suitable for basic local storage with key/value pairs; while WebSQLDatabase is a storage method suitable for relational databases. Developers can use SQL syntax to query, insert and other operations on these data.

Multi-threading

HTML5 uses Web Worker to liberate Web applications from the original single-threaded industry. Multi-threaded operations can be achieved by creating a Web Worker object. . Web programs created by JavaScript are all executed in a single thread, and the response time is long. When JavaScript is too complex, deadlock situations may occur. HTML5 adds a new WebWorker API. Users can create multiple threads in the background and hand over long-term processing to the background without affecting the user interface and response speed. These processes will not be interrupted due to user interaction. Page and window objects cannot be accessed using background threads, but background threads can interact with data between pages. The general steps for data interaction between sub-threads are as follows: ① First create a sub-thread to send data; ② Execute the sub-thread task and send the data to be transferred to the main thread; ③ After the main thread receives the data passed by the sub-thread, When sending a message, create a sub-thread that receives data, and then pass the message returned in the sub-thread that sends data to the sub-thread that receives data; ④ Execute the code in the sub-thread that receives data.

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Advantages and Disadvantages

Advantages

The new generation of network standards enables programs to pass through Web browsers, consumers This enables access to the same programs and cloud-based information from any terminal, including a PC, laptop, smartphone or tablet. HTML5 allows programs to run through Web browsers and includes multimedia content such as videos that currently require plug-ins and other platforms. This will make the browser a universal platform that users can complete tasks through the browser. In addition, consumers can access a variety of content remotely stored in the "cloud" regardless of location and device. Due to the relatively advanced local storage technology in HTML5 technology, it can reduce the response time of applications and bring a more convenient experience to users.

Disadvantages

(1) Troubles caused by openness

In the past, there were a large number of patented products on the network platform, and we wanted to implement HTML5 technology A large number of applications first require these patented products to be turned into open products. Due to various reasons, there are still many controversies facing this issue. Taking video formats as an example, two camps have disputes over the setting of video formats. One camp is represented by Apple, and the other camp is represented by Opera, Firefox, and Google. The WPEG camp is the camp to which Apple belongs. Since it all uses this format, it insists that this format should be used as a standard. The WebM camp believes that since the patent of the WPEG format has not been lifted, it has no openness to the technical requirements of HTML5. It does not meet the standards, so we do not agree to use it as a standard format.

(2) The speed of development needs to be improved

In HTML5, some new technologies that were not available in previous HTML technology have been proposed, but many mainstream browsers have developed over a long period of time. After completing the development of this technology and implementing this function in its own browser, there are certain problems with the development speed of HTML5. At the same time, due to the immaturity of HTML5, the current technical standards related to HTML5 have not been fully determined, so it is still difficult to put it into large-scale application in a short time.

(3) Imperfect technical means

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