html5's full name is "HyperText Markup Language 5", which is a language description method for constructing Web content. It is the fifth revision of the HTML standard. Its main goal is to semanticize the Internet for better be readable by humans and machines, while providing better support for embedding in a variety of media.
The operating environment of this tutorial: Windows 7 system, HTML5 version, Dell G3 computer.
HTML5 is the abbreviation of HyperText Markup Language 5, which is a language description method for building 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.
HTML5 is the fifth revision to the HTML standard. Its 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. HTML5 syntax is backwards compatible. H5, which is now commonly referred to in China, includes CSS3 and JavaScript (strictly speaking, it is not appropriate to call it this way, but it is already wrong to call it this way).
HTML was created in 1990, and HTML4 became an Internet standard in 1997 and is widely used in the development of Internet applications. HTML5 is the latest revised version of HTML. The standard was completed by the World Wide Web Consortium (W3C) in October 2014.
Advantages of HTML5
The new generation of network standards enables programs to be accessed through web browsers, allowing consumers to access the data from PCs, laptops, smartphones or tablets. Access the same programs and cloud-based information from any terminal, including
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 use through the browser. can complete the task.
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 of HTML5
(1) Troubles caused by openness
In the past, there were a large number of patented products on the network platform. The large-scale application of HTML5 technology first requires these patented products to be turned into open products. Due to various reasons, there is still a lot of controversy over 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. [1]
(3) Imperfect technical means
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html5的div元素默认一行不可以放两个。div是一个块级元素,一个元素会独占一行,两个div默认无法在同一行显示;但可以通过给div元素添加“display:inline;”样式,将其转为行内元素,就可以实现多个div在同一行显示了。

html5中列表和表格的区别:1、表格主要是用于显示数据的,而列表主要是用于给数据进行布局;2、表格是使用table标签配合tr、td、th等标签进行定义的,列表是利用li标签配合ol、ul等标签进行定义的。

固定方法:1、使用header标签定义文档头部内容,并添加“position:fixed;top:0;”样式让其固定不动;2、使用footer标签定义尾部内容,并添加“position: fixed;bottom: 0;”样式让其固定不动。

HTML5中画布标签是“<canvas>”。canvas标签用于图形的绘制,它只是一个矩形的图形容器,绘制图形必须通过脚本(通常是JavaScript)来完成;开发者可利用多种js方法来在canvas中绘制路径、盒、圆、字符以及添加图像等。

html5中不支持的标签有:1、acronym,用于定义首字母缩写,可用abbr替代;2、basefont,可利用css样式替代;3、applet,可用object替代;4、dir,定义目录列表,可用ul替代;5、big,定义大号文本等等。

html5废弃了dir列表标签。dir标签被用来定义目录列表,一般和li标签配合使用,在dir标签对中通过li标签来设置列表项,语法“<dir><li>列表项值</li>...</dir>”。HTML5已经不支持dir,可使用ul标签取代。

html5是指超文本标记语言(HTML)的第五次重大修改,即第5代HTML。HTML5是Web中核心语言HTML的规范,用户使用任何手段进行网页浏览时看到的内容原本都是HTML格式的,在浏览器中通过一些技术处理将其转换成为了可识别的信息。HTML5由不同的技术构成,其在互联网中得到了非常广泛的应用,提供更多增强网络应用的标准机。

3种取消方法:1、给td元素添加“border:none”无边框样式即可,语法“td{border:none}”。2、给td元素添加“border:0”样式,语法“td{border:0;}”,将td边框的宽度设置为0即可。3、给td元素添加“border:transparent”样式,语法“td{border:transparent;}”,将td边框的颜色设置为透明即可。


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