HTML .lt;meta.gt; tags
Labels are auxiliary tags at the head of the HTML language that provide meta-information about the page (e.g., descriptions and keywords for search engines and update frequency, language used to define the page), and it is beneficial for HTML to use a good label.Metadata that describes html documents:
<meta name="description" content="免费web教程">
<meta name="keywords" content="HTML,CSS,XML,JavaScript">
<meta name="author" content="W3Cschool">
<meta charset="UTF-8">
</head>
Try it out . . .
Browser support
All major browsers support the hashtag.
Label definition and instructions for use
Metadata is the data information for the data.
The label provides metadata for the HTML document. Metadata is not displayed on the client, but is parsed by the browser.
META elements are typically used to specify the description of the page, keywords, the last time the file was modified, the author, and other metadata.
Metadata can be called using a browser (how to display content or reload pages), search engines (keywords), or other Web services.
Note: The metadata in the label cannot be represented by other meta-related labels, such as: slt;base,lt;link,","
Tips and comments
Note: The label is usually located in the area of the slt;head.
Note: Metadata usually appears as a name/value pair.
Note: If the name property is not provided, the name in the name/value pair takes the value of the http-equiv property.
The difference between HTML 4.01 and HTML5
HTML5 does not support the scheme property.
In HTML5, there is a new charset property that makes the definition of character sets easier:
- HTML 4.01：<meta http-equiv="content-type" content="text/html; charset=UTF-8">
- HTML5：<meta charset="UTF-8">
The difference between HTML and XHTML
In HTML, the label does not end the label.
In XHTML, the label must contain an end label.
Example 1 - Define document keywords for search engines:
Instance 2 - Define the description of the web page:
Instance 3 - Define page author:
Instance 4 - Refresh the page every 30 seconds:
Property
New :HTML5 new property.
| 属性 | 值 | 描述 |
|---|---|---|
| charset New | character_set | 定义文档的字符编码。 |
| content | text | 定义与 http-equiv 或 name 属性相关的元信息。 |
| http-equiv |
content-type
default-style refresh |
把 content 属性关联到 HTTP 头部。 |
| name |
application-name
author description generator keywords |
把 content 属性关联到一个名称。 |
| scheme | format/URI | HTML5不支持。 定义用于翻译 content 属性值的格式。 |
The event property
The label supports all HTML event properties.
Online tools
Related articles
HTML tutorial: HTML header