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HTML5 id Attribute

HTML5 Global Attributes

Example

Use the id attribute to manipulate text with JavaScript:

<html>
<head>
<script type="text/javascript">
function displayResult()
{
document.getElementById("myHeader").innerHTML="Have a nice day!";
}
</script>
</head>

<body>
<h1 id="myHeader">Hello World!</h1>
<button onclick="displayResult()">Change text</button>
</body>

</html>

Try it yourself »
(more examples at the bottom of this page)

Browser Support

The id attribute is supported in all major browsers.

Definition and Usage

The id attribute specifies a unique id for an HTML element (the value must be unique within the HTML document).

The id attribute is most used to point to a style in a style sheet, and by JavaScript (via the HTML DOM) to manipulate the element with the specific id.

Differences Between HTML 4.01 and HTML5

In HTML5, the id attribute can be used on any HTML element (it will validate on any HTML element. However, it is not necessarily useful).

In HTML 4.01, the id attribute cannot be used with: <base>, <head>, <html>, <meta>, <param>, <script>, <style>, and <title>.

Syntax

<element id="id">

Attribute Values

Value	Description
id	Specifies a unique id for the element. Naming rules: Must begin with a letter A-Z or a-z Can be followed by: letters (A-Za-z), digits (0-9), hyphens ("-"), and underscores ("_") In HTML, all values are case-insensitive

Try it Yourself - Examples

Add an id attribute to an HTML element, and use it in CSS
Use the id attribute to style text with CSS.