The meta tag describes some basic metadata .
<meta>The tags provide metadata. Metadata is not displayed on the page, but will be parsed by the browser.
The META element is usually used to specify the description of the web page , keywords , the last modification time of the file , the author , and other metadata.
Metadata can be used in browsers (how to display content or reload pages), search engines (keywords), or other web services.
<meta>Usually placed in the <head>region
<meta name="keywords" content="HTML, CSS, XML, XHTML, JavaScript">
Define the description content for the web page:
<meta name="description" content="免费 Web & 编程 教程">
Define Web page author:
<meta name="author" content="Runoob">
Refresh the current page every 30 seconds:
<meta http-equiv="refresh" content="30">