HTML | Id Attributes

The id attribute is a unique identifier which is used to specify the document. It is used by CSS and JavaScript to perform a certain task for a unique element. In CSS, the id attribute is used using # symbol followed by id.
Syntax:

 <tag id=""></tag>

Example:

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<!DOCTYPE html>
<html>
<head>
    <title>Id Attributes</title>
    <style> 
        #gfg {
            color:#009900;
            font-size:50px;
            font-weight:bold;
            text-align:center;
         }
         #geeks {
             text-align:center;
             font-size:20px;
         }
    </style>
</head>
<body>
    <div id="gfg">GeeksforGeeks</div>
    <div id="geeks">A computer science portal for geeks</div>
</body>
</html>                    

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Output:

id attributes


Note: In HTML5, id attributes can be used by any HTML tag but in HTML 4.01 there are some restriction to use id attributes. It can not be used by <base>, <head>, <html>, <meta>, <param>, <script>, <style>, and <title> tag. In HTML4.01 id can not start with number.


Use of ID attributes in JavaScript

In JavaScript, the id attribute is used to manipulate the text, if you want to make changes on a precise element in your script, then you can use id attribute. 




Example:











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<!DOCTYPE html> 


<html> 


    <head> 


        <title>use id in javascript</title> 


        <style> 


            #geeks { 


                font-size:50px; 


                color:#009900; 


                font-weight:bold; 


                margin-bottom:10px; 


            } 


        </style> 


    </head> 


    <body> 


    <div id="geeks">GeeksforGeeks</div> 


    <button onclick="geeksResult()">Display text change</button> 


      


    <script> 


    function geeksResult() { 


        document.getElementById("geeks").innerHTML =  


                             "A computer science portal for geeks"; 


        document.getElementById("geeks").style.color = "black"; 


    } 


    </script> 


      


    </body> 


</html>                     



















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Output:

id selector


Supported Browsers: The browser supported by Id Attribute are listed below:


    

  • Google Chrome
    • 

  • Internet Explorer
    • 

  • Mozilla
    • 

  • Opera
    • 

  • Safari
    • 



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