Lesson02_05 Head Element _ Basics Tutorial

The header element is the element that is located between the

<title></title>

What's displayed on the title bar

<base>

Used to specify the base address of all hyperlinks in a Web page to change the base address of all URLs that use relative addresses in a Web page.
The use of the <base> label is as follows:
<base href= "http://www.loncer.cn/JStudy/" target= "_blank" >

property sheet

Property name	function
Href	Set the base address of the relative URL address of all HTTP protocols in the Web page, if the page has the following code: <a href= "lesson01_03.html" >Lesson01_03</a> It will open Http://www.loncer.cn/JStudy/Lesson01_03.html when clicked
Target	Lets you set the target window for all hyperlinks in a Web page so that you can omit all hyperlinks Add Target attribute

<link>

Defines the relationship between the current document and another document or resource

property sheet

Property name	function
Href	Defines the URL address of another resource, required
Rel and Rev	Defines the type of relationship between the two resources that are linked by <link>, both of which must be selected
Title	Describes the link's relationship, or it can be a string that describes the target resource, is optional
Type	Gives the MIME type of the target resource, for example: HTML is: "Text/html" CSS for: "Text/css" JavaScript is: "Text/javascript"
Media	The media or media used to specify the destination data to be received, only on the specified output Screen: On computer screens (default) Print: Printer Projection: Projector Aural: Speaker Braile: Braille Tactile sensing equipment (for the blind) TTY: Fax typewriter TV: Television All: The above equipment used
Page-enter	Effects of loading Web pages
Page-exit	The effect that appears when you leave a Web page

<meta>

There are two main types of <meta> divided by different attribute names, namely: Name and Http-equiv.

Name property:

Use to add some descriptive information about a Web page to the Web page in the following format:
<meta name= "A set value" content= "the information specifically added to this setting value"

Name property sheet

name	content
Keywords	Tell the search engine to release the robot or spider, the content attributes filled in as a Web page keyword added to the search engine, the content attribute of multiple keywords can be separated by commas, such as: <meta name= "keywords" content= "China it database, all kinds of information, download" >
Description	Add content to the search engine as a description of the content of the page, or, if not, a few lines at the beginning of the page that appear below the link to the page in the search results list.
Robots	Tell the search engine to release the robots can be based on the content of the settings in the manner used, can be the following values Index: This page can be retrieved and included (default value) NOINDEX: This page cannot be retrieved and included Follow: Let Robots/spider follow the hyperlinks on this page to look down Nofollow: Don't let down None: Nothing can be done All: Anything can
Generator	Used to describe the tool used to edit this page, in the content as a tool name
Author	Used to describe the author of a Web page, in content
Copyright	For copyright notices, content in the copyright notice

HTTP-EQUIV Properties:

The response header used to simulate an HTTP protocol in an HTML document, which is treated in the same way as a response message header sent by the WWW server when the browser reads the <meta> label with the HTTP-EQUIV attribute in the Web page file.

Http-equiv Property sheet

Property name	function
Content-type	Describes the MIME type of Web page content and the character set encoding used for text content, for example: <meta http-equiv= "Content-type" content= "text/html;charset=gb2312" >
Refresh	Specifies that the page is automatically refreshed after a certain period of time, for example: <meta http-equiv= "Refresh" content= "1" > One second Refresh page You can also add a URL after the time to jump to this page at a specified time, for example: <meta http-equiv= "Refresh" content= "1";url=http://www.thinkme.cn> Note: The URL is separated from the time by a comma
Expires	Specifies that the Web page's expiration time in the browser, such as when the browser is on a computer that exceeds the time specified in the content, must be downloaded to the server when it is accessed. Note that the > settings in the Content property must use GMT time format, for example: <meta http-equiv= "Expires" content= "mon,12, May 2006 00:20:00 GMT" > Note: Setting content to 0 prevents browsers from using cached pages
Windows-target	Forces the page to appear in a window. For example, use the following code to prevent your Web page from being made a frame page call <meta http-equiv= "Windows-target" content= "_top" >
Pragma	Used to prevent browsers from caching this page on the local computer as follows: <meta http-equiv= "Pragma" content= "No-cache" >