When we first come into contact with php or HTML, we will encounter HTML and XML, but what is the difference between them? In this article, we mainly share with you the analysis of the differences between HTML and XML, hoping to help you.
1. HTML is called Hypertext Markup Language;
##XML is an extensible markup language; It has no tag set (tagset), there is no grammatical rule (grammatical rule), but it has syntax rule (syntax rule). Any XML document must be well-formed for any type of application and correct parsing, that is, each open tag must have a matching closing tag, must not contain tags in reverse order, and must be well-formed in statement composition. Should meet the requirements of technical specifications. An XML document can be valid, but it does not necessarily need to be valid. A valid document is a document that conforms to its document type definition (DTD). A document is schema valid if it conforms to the provisions of a schema.
2. The difference between HTML and XML:
xml and html are both used to manipulate data or data structures , are roughly the same in structure, but there are obvious differences in their essence. A summary of various information on the Internet is as follows
(1)Different grammatical requirements
1. is case-insensitive in html and in xml## Strictly distinguish between #.
2.In HTML, sometimes loosely, if the context clearly shows the paragraph or list key Where it ends, then you can omit the closing tags such as
or . In XML, it is a strict tree structure, and the end tag must not be omitted. 3.In XML, elements that have a single tag without a matching closing tag must be / characters as the end. This way the parser knows not to look for the closing tag.
4.In XML, attribute values must be enclosed in quotation marks. In HTML, quotation marks are available or not. 5. In HTML, you can have attribute names without values. In XML, all attributes must have corresponding values. 6. In the XML document, the white space will not be parsed Automatically deleted; but html filters out spaces. (2) Different marks
1, html uses inherent tags; xml does not have inherent tags. 2、Html tags are predefined; XMLtags are free, customizable, and scalable. (3) different functions
##1. html is used to display data; xml is used to describe and store data, so it can be used as a persistence medium! Html Combine data and display and display the data on the page; xml then Separate data and display. XML is designed to describe data, with the focus being the content of the data. HTML is designed to display data, with the focus being on the appearance of the data. 2. xml is not a replacement for HTML, xml and html are two languages with different uses. XML is not meant to replace HTML; in fact XML can be regarded as a supplement to HTML . XML and HTML have different goals HTML is designed to display data and Focus on the appearance of data, while the design goal of XML is to describe data and focus on the content of the data. 3. No behaviorXML. Similar to HTML , XML does nothing. (Common ground) 4. The best way to describe XML is probably : XML is a cross-platform, software- and hardware-independent tool for processing and transmitting information. 5. XML will be everywhere in the future. XML will become the most common tool for data processing and data transmission. Related recommendations: What is the difference between html, xhtml and xml
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本篇文章带大家了解一下HTML(超文本标记语言),介绍一下HTML的本质,HTML文档的结构、HTML文档的基本标签和图像标签、列表、表格标签、媒体元素、表单,希望对大家有所帮助!

不算。html是一种用来告知浏览器如何组织页面的标记语言,而CSS是一种用来表现HTML或XML等文件样式的样式设计语言;html和css不具备很强的逻辑性和流程控制功能,缺乏灵活性,且html和css不能按照人类的设计对一件工作进行重复的循环,直至得到让人类满意的答案。

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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。

在html中,document是文档对象的意思,代表浏览器窗口的文档;document对象是window对象的子对象,所以可通过“window.document”属性对其进行访问,每个载入浏览器的HTML文档都会成为Document对象。

html5支持boolean值属性;boolean值属性指是属性值为true或者false的属性,如input元素中的disabled属性,不使用该属性表示值为flase,不禁用元素,使用该属性可以不设置属性值表示值为true,禁用元素。


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