11.41. HTML5 form element

11.41.1. New form elements for HTML5 ¶

HTML5 has the following new form elements:

• Note: not all browsers support HTML5’s new form elements, but you can use them again, even if browsers don’t support form attributes, they can still be displayed as regular form elements.

  11.41.2. HTML5 < datalist > element ¶

  Use the list attribute of the element is the same as that of the

  

  Example ¶

  element usage

  <inputlist="browsers"><datalistid="browsers"><optionvalue="Internet
  Explorer">Firefox">Chrome">Opera">Safari">
       
   
    11.41.3.  HTML5      element  ¶  
   
        the purpose of the element is to provide a reliable way to authenticate the user. 
   
        the label specifies the key pair generator field used for the form. 
   
   When the form is submitted, two keys are generated, one is the private key and the other is the public key. 
   
   The private key is stored on the client, and the public key is sent to the server. The public key can be used to validate the user’s client certificate later. 
   
                  
   
   
   Example  ¶  
   
   With   keygen   form for the field: 
   
   
   
  <formaction="demo_keygen.asp"method="get">user name:<inputtype="text"name="usr_name">encryption:<keygenname="security"><inputtype="submit">form>
       
   
    11.41.4.  HTML5   
     element  ¶   
     
     elements are used for different types of output, such as calculation or script output:  
                  
   
   
   Example  ¶  
   
   Display the calculation results in the   
     elements:  
   
   
  <formoninput="x.value=parseInt(a.value)+parseInt(b.value)">0<inputtype="range"id="a"value="50">100
  +<inputtype="number"id="b"value="50">=<outputname="x"for="a
  b">
   
   
     
   
    11.41.5.  HTML5 New form element  ¶  
   
       
   
   
   
   Label 
   
   
   
   Description 
   
   
   
   
   
   
   
   < datalist > 
   
   
   
   The < input > tag defines the list of options. Use this element with the input element to define possible values for input. 
   
   
   
   
   
   < keygen > 
   
   
   
   The < keygen > tag specifies the key pair generator field used for the form. 
   
   
   
   
   
   < output > 
   
   
   
   The < output > tag defines different types of output, such as the output of a script. 
   
   
   
   
   
    
                          
                          
                      
                  
                  
  
                      
  
                          
                              
  
                                  文章链接
                                  ： 11.41. HTML5 form element 
                              
                          
                      
                  
              
          
          
  
              
  
      
          
              
  
                  
  
                      
  
                          
                              
                              
                                  
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