


HTML5 is the latest HTML standard. Sooner or later, all web programmers will find that they need to use this latest standard. Moreover, many people will feel that it is more difficult to redevelop a website with HTML5 than to develop a website. Migrating from HTML4 to HTML5 is much easier because there are significant differences between the two versions.
In fact, HTML5 does not make any major changes to HTML4. Many of them are similar.
However, there are some important differences you need to know. Listed below are some of the main differences between HTML4 and HTML5 (not all, it is impossible to list them all):
1. The HTML5 standard is still being developed
This first difference is obvious, but so important that I need to start with it. Maybe you've noticed that there's a lot of talk about how cool HTML5 is, but the reality is that HTML5 is an unfinished standard. HTML4 is already 10 years old, but the fact that it is still the current official standard has not changed.
On the other hand, HTML5 is still in its early stages, and future modifications will continue to appear. You must take this into consideration, because the newly added or modified web elements you use on your website will change every year, and you need to constantly update and upgrade your website, which is not what you want. This is why, for now, you're better off using HTML4 in production and only using HTML5 in experiments.
2. Simplified syntax
Simpler doctype declaration is one of the many new features in HTML5. Now you just write and that's it. The syntax of HTML5 is compatible with HTML4 and XHTML1, but not SGML.
3. A new
For Web users, Flash is both a surprise and a pain. There are many web developers who are dissatisfied with the threat HTML5 poses to Flash. But for those of you who put up with bloated Flash videos that took years to load and run, the technology to generate videos with the new

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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