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XHTML learning records

Source: Internet
Author: User
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Document directory
  • XHTML 1.0 strict
  • XHTML 1.0 transitional
  • XHTML 1.0 frameset
What is XHTML?
  • XHTML refers to the Extensible hypertext markup language ).
  • The goal of XHTML is to replace HTML.
  • The XHTML and HTML 4.01 are almost the same.
  • XHTML is a more rigorous and pure HTML Version.
  • XHTML is the HTML that is redefined as an XML application.
  • XHTML is a W3C standard.

XHTML is a combination of HTML and XML (Extended Markup Language.

XHTML contains all HTML 4.01 elements combined with XML syntax.

 

Major differences:
  • XHTML elements must be correctly nested.
  • The XHTML element must be disabled.
  • The tag name must contain lowercase letters.
  • The XHTML document must have the root element.

 

More XHTML syntax rules:

  • The property name must be in lowercase.
  • The attribute value must be enclosed in quotation marks.
  • Attribute cannot be abbreviated
  • Replace the name attribute with the ID attribute
  • Xhtml dtd defines mandatory HTML elements

 

Mandatory XHTML Elements

All XHTML documents must declare the file type (doctype Declaration ). The HTML, Head, and body elements must exist in the XHTML document, and the title element must be in the head element.

Below is a minimal XHTML file template:

<!DOCTYPE Doctype goes here>

Three XML document types in XHTML 1.0
XHTML 1.0 specifies three types of XML documents to correspond to the above three DTD types.
XHTML 1.0 strict
<!DOCTYPE htmlPUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN""http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
In this case, a clean mark is required to avoid confusion. Use it with the stacked style sheet.
XHTML 1.0 transitional
<!DOCTYPE htmlPUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN""http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
In this case: When you need to use HTML's performance features, and you need to write XHTML for browsers that do not support stacked style sheets.
XHTML 1.0 frameset
<!DOCTYPE htmlPUBLIC "-//W3C//DTD XHTML 1.0 Frameset//EN""http://www.w3.org/TR/xhtml1/DTD/xhtml1-frameset.dtd">
In this case, you need to use the HTML framework to split the browser window into two or more frames.
Core Attributes)
The following tags do not provide the following attributes: Base, Head, HTML, Meta, Param, script, style, and title.

  
   

   
     
     
 
      Attribute 
      Value 
      Description 
     
 
     
 
      Class 
      Class_rule or style_rule 
      Element class) 
     
 
     
 
      ID 
      Id_name 
      A specific ID of an element 
     
 
     
 
      Style 
      Style Definition 
      Inline style Definition 
     
 
     
 
      Title 
      Prompt text 
      Text displayed in the prompt Tool 
     
 
    
  
   
Language attributes)
The following tags do not provide the following attributes: Base, BR, frame, frameset, HR, IFRAME, Param, and script elements.

  
   

   
     
     
 
      Attribute 
      Value 
      Description 
     
 
     
 
      Dir 
      LTr | RTL 
      Set the text direction 
     
 
     
 
      Lang 
      Language code 
      Set language code 
     
 
    
  
   
Keyboard attributes)
  
   

   
     
     
 
      Attribute 
      Value 
      Description 
     
 
     
 
      Accesskey 
      Character 
      Set the keyboard shortcut for accessing an element 
     
 
     
 
      Tabindex 
      Quantity 
      Set the tab order of an element 
     
 
    
  
   
Window events)
Valid only in the body and frameset elements.

  
   

   
     
     
 
      Attribute 
      Value 
      Description 
     
 
     
 
      Onload 
      Script 
      Execute the script when the document is loaded. 
     
 
     
 
      OnUnload 
      Script 
      Execute the script when the document is detached. 
     
 
    
  
   
Form element event (form Element events)
Valid only in form elements.

  
   

   
     
     
 
      Attribute 
      Value 
      Description 
     
 
     
 
      Onchange 
      Script 
      Execute the script when the element changes. 
     
 
     
 
      Onsubmit 
      Script 
      Execute the script when the form is submitted. 
     
 
     
 
      Onreset 
      Script 
      Execute the script when the form is reset. 
     
 
     
 
      Onselect 
      Script 
      Execute the script when the element is selected. 
     
 
     
 
      Onblur 
      Script 
      Execute the script when the element loses focus 
     
 
     
 
      Onfocus 
      Script 
      Execute the script when the element gets focus 
     
 
    
  
   
Keyboard Events)
The following elements are invalid: Base, BDO, BR, frame, frameset, Head, HTML, IFRAME, Meta, Param, script, style, and title.

  
   

   
     
     
 
      Attribute 
      Value 
      Description 
     
 
     
 
      Onkeydown 
      Script 
      Execute the script when the keyboard is pressed 
     
 
     
 
      Onkeypress 
      Script 
      Execute the script when the keyboard is pressed and loose. 
     
 
     
 
      Onkeyup 
      Script 
      Execute the script when the keyboard is released 
     
 
    
  
   
Keyboard Events)
The following elements are invalid: Base, BDO, BR, frame, frameset, Head, HTML, IFRAME, Meta, Param, script, style, and title.

  
   

   
     
     
 
      Attribute 
      Value 
      Description 
     
 
     
 
      Onclick 
      Script 
      Execute the script when the mouse is clicked 
     
 
     
 
      Ondblclick 
      Script 
      Execute the script when the mouse is double-clicked. 
     
 
     
 
      Onmousedown 
      Script 
      Execute the script when the mouse button is released 
     
 
     
 
      Onmousemove 
      Script 
      Execute the script when the mouse pointer moves 
     
 
     
 
      Onmouseout 
      Script 
      Execute the script when the mouse pointer removes an element. 
     
 
     
 
      Onmouseover 
      Script 
      Execute the script when the cursor is hovering over an element. 
     
 
     
 
      Onmouseup 
      Script 
      Execute the script when the mouse button is released

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

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