2018-05-07 HTML Getting Started

This article mainly writes some basic knowledge of HTML (Hypertext Markup Language, Hyper text Markup Language) (mainly from Wikipedia and MDN) 1. About Us

The World Wide Web Consortium, also knownas theWide, is a major international standards Organization for the World Wide Web.

The World Wide Web Consortium was established by Tim Berners-Lee, who left CERN in October 1994, with the support of the European Commission and the National Defense Advanced Research Program (DARPA), MIT's MIT Computer Science and Artificial Intelligence Laboratory (MIT/LCS), DARPA was the first to launch the Internet and its predecessor, ARPANET.
In order to solve the problem of incompatibility between different platforms, technologies and developers in network applications, and to ensure the smooth and complete circulation of network information, the World Wide Web Consortium has developed a series of standards and urged Web application developers and content providers to follow these standards. The standard content includes the specification of the language used, the guidelines used in development and the behavior of the interpretation engine, and so on. The broad range of standard specifications, including XML and CSS, has been developed.
(Excerpt from Wikipedia)

2. Introduction to MDN

MDN Web Docs(formerly known as Mozilla Developer Network, Mozilla Developer Center, or MDN) is a free website that brings together numerous Mozilla Foundation product and Web technology development documents.
(Excerpt from Wikipedia)

When you need to query for an HTML tag usage, you can use Google keywords to query on the MDN Web site
such as: Ananchor MDN can query the use of tags.

3. HTML All Tags list

Https://developer.mozilla.org/zh-CN/docs/Web/HTML/Element
The above link is a list of all the HTML tags displayed by MDN and the specific usage, if necessary, can be clicked query

4. Empty tags/empty elements

An empty element may be a html,svg, or an element in a MathML that cannot have a child node (such as an inline element or text within an element).
In HTML, it is not always valid to use a closed tag on an empty element. For example, <input type="text"></input> the closed tag is not valid for HTML.
(Excerpt from MDN)

The following empty tags are in the HTML

• <area>
• <base>
• <br>
• <col>
• <colgroup>When the span is present
• <command>
• <embed>
• <input>
• <keygen>
• <link>
• <meta>
• <param>
• <source>
• <track>
• <wbr>

5. Replaceable elements

In CSS, the display of replaceable elements (replaced element) is not controlled by CSS. These elements are external objects that have a kind of appearance rendering independent of CSS. Typical replaceable elements are, <object> ,, <video> and form elements, such as <textarea> , <input> . Some elements behave as replaceable elements only in some special cases, such as <audio> and <canvas> . contentobjects that are inserted through CSS properties are called anonymous replaceable elements (anonymous replaced elements).

In some cases, CSS does special handling of replaceable elements, such as calculating margins and some auto values.

It is important to note that some (not all) replaceable elements, which themselves have dimensions and baselines (baseline), are vertical-align used by some CSS properties such as the like.

2018-05-07 HTML Getting Started