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The id attribute is used to define a unique id for an HTML element.
The id used to identify a unique element and its content.
The id attribute value should not contain white space.
If any two of the element has same name, we can identify a single element by its id attribute.

Syntax for id attribute in HTML:

<element id=”value”>

Difference between HTML 4.01 and HTML 5 for id Attribute:

HTML 4.01

In HTML 4 the id value cannot start with number.
In HTML4 id attribute does not supports with <base>, <head>, <html>, <meta>, <param>, <script>, <style>, and <title> element.

HTML 5

In HTML5 the id attribute supports all the element.

Applies To:

Element	Attribute
All HTML elements	id

id Attribute Value:

Value	Description
id	id attribute used to specifies a unique id for the element.

Sample Coding for id Attribute in HTML:

Tryit<!DOCTYPE html>
<html>
    <head>
        <title>Wikitechy id Attribute</title>
    </head>
    <body>
        <h1 id=”title”>Wikitechy HTML.</h1>
        <button onclick=”change_title()”>Change Title!</button>
        <script>
            function change_title()
            {
             document.getElementById("title").innerHTML = "Wikitechy CSS.";
            }
        </script>
    </body>
</html>

Code Explanation for id Attribute in HTML:

<h1> tag has the id attribute with the value of “title”.
<button> tag is have the onclick attribute to call “change_title()” JavaScript function on button click.
change_title() function change the content as “Wikitechy CSS.” which element has id attribute value as “title”.

Output for id Attribute in HTML:

The output shows “Wikitechy HTML” when the page loads.

When the button clicked the content changed to “Wikitechy CSS.”

Browser Support for id Attribute in HTML:


Yes	Yes	Yes	Yes	Yes

PDF

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html tutorial - id Attribute in HTML - html5 - html code - html form

Syntax for id attribute in HTML:

Difference between HTML 4.01 and HTML 5 for id Attribute:

HTML 4.01

HTML 5

Applies To:

id Attribute Value:

Sample Coding for id Attribute in HTML:

Code Explanation for id Attribute in HTML:

Output for id Attribute in HTML:

Browser Support for id Attribute in HTML:

Related Searches to id Attribute in html

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html tutorial - id Attribute in HTML - html5 - html code - html form

Syntax for id attribute in HTML:

Difference between HTML 4.01 and HTML 5 for id Attribute:

HTML 4.01

HTML 5

Applies To:

id Attribute Value:

Sample Coding for id Attribute in HTML:

Code Explanation for id Attribute in HTML:

Output for id Attribute in HTML:

Browser Support for id Attribute in HTML:

Related Searches to id Attribute in html

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