According to the principles of w3c, each start tag of xml must have a corresponding end tag, that is, must end with to be a complete element, unless it is a self-closing tag, self-closing It’s a tag like .
html is a child of xml, so it must also follow the principles of xml. This is the standard.
So, does not add/> to end, it does not meet the standards and is only suitable for versions before HTML 4.0. Currently, most websites use the xhtml standard writing method for SEO and multi-browser support.
HTML超文本标记语言--超在那里？（文档分析）Aug 02, 2022 pm 06:04 PM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！
html和css算编程语言吗Sep 21, 2022 pm 04:09 PM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。
web前端笔试题库之HTML篇Apr 21, 2022 am 11:56 AM总结了一些web前端面试（笔试）题分享给大家，本篇文章就先给大家分享HTML部分的笔试题（附答案），大家可以自己做做，看看能答对几个！
HTML5中画布标签是什么May 18, 2022 pm 04:55 PMHTML5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废弃了哪个列表标签Jun 01, 2022 pm 06:32 PMhtml5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。
html中document是什么Jun 17, 2022 pm 04:18 PM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值属性吗Apr 22, 2022 pm 04:56 PMhtml5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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