The differences are: 1. The difference in definition, HTML4 is produced to adapt to the PC era, and HTML5 is produced to adapt to the mobile Internet era; 2. The difference in tags, HTML5 code is more concise than HTML4 code; 3 , HTML5 adds a variety of elements; 4. HTML5 is more suitable for the requirements of the times.
The operating environment of this tutorial: Windows7 system, HTML4&&HTML5 version, Dell G3 computer.
HTML5 has developed at an alarming rate since its official launch in 2010. Now mainstream browsers basically support HTML5 (except for some individual features that have browser compatibility issues). This shows that HTML5 is becoming more and more popular. welcome. It can be predicted that HTML5 will become the mainstream technology of web front-end in the near future. HTML5 special effects are better adapted to the mobile Internet era and can better support multimedia running on mobile devices.
What is the difference between html5 and html4?
Difference in definition
HTML5 is the fifth modification of Hypertext Markup Language (HTML), HTML4 is Hypertext Markup Language (HTML) The fourth revision, they are the 5th and 4th versions of the HTML language respectively. HTML4 was produced to adapt to the PC era, and HTML5 was produced to adapt to the mobile Internet era. They are all standard languages recommended by w3c (World Wide Web).
The difference between tags
HTML5 code is more concise than HTML4 code. Some new elements and new attributes of HTML5 can make web development easier and simpler, such as HTML5 Improved API. Before HTML5, many functions had to be implemented using JavaScript, but now you can just use the tag attributes of HTML5 elements. Because HTML5 has a large number of replaceable script (javascript) attributes on web pages, it makes the language simple and easy to understand, and HTML4 alone needs to cooperate with javascript to achieve this.
New elements
HTML5 adds canvas element (painting), video element (media playback), audio element, new special content elements (article, footer, header, nav, section), form controls (calendar, date, time, email, url, search), for example, the div used before can now be replaced by HTML5 structured tags, which makes the entire page more intuitive and easy to understand.
HTML5 is more suitable for the requirements of the times
The mobile Internet era is more eager to have a unified standard than the PC era. Previously, due to the inconsistency between browsers, a lot of time was wasted due to bugs caused by modifying browser compatibility. In HTML5, video, audio, images, and animations will be standardized, which will solve the headache of browser compatibility.
The difference between markup methods
HTML5 syntax is mainly DOCTYPE (DOCTYPE declaration method: ) and specified character encoding (append charset attribute to mate element Specified encoding:
Recommended learning: html video tutorial
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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。

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。

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。


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