Web/API/Element/id

The id property of the Element interface represents the element's identifier, reflecting the id global attribute.

If the id value is not the empty string, it must be unique in a document.

The id is often used with getElementById() to retrieve a particular element. Another common case is to use an element's ID as a selector when styling the document with CSS.

Note: Identifiers are case-sensitive, but you should avoid creating IDs that differ only in the capitalization.

Syntax

var idStr = element.id; // Get the id
element.id = idStr; // Set the id

• idStr is the identifier of the element.

Specifications

Specification	Status	Comment
DOMThe definition of 'id' in that specification.	Living Standard	No change from Document Object Model (DOM) Level 2 HTML Specification.
Document Object Model (DOM) Level 2 HTML SpecificationThe definition of 'id' in that specification.	Obsolete	No change from Document Object Model (DOM) Level 1 Specification.
Document Object Model (DOM) Level 1 SpecificationThe definition of 'id' in that specification.	Obsolete	Initial definition.

Browser compatibility

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
id	Chrome Full support 42	Edge Full support 12	Firefox Full support Yes	IE Full support Yes	Opera Full support Yes	Safari Full support 6	WebView Android Full support 42	Chrome Android Full support 42	Firefox Android Full support Yes	Opera Android Full support Yes	Safari iOS Full support Yes	Samsung Internet Android Full support 4.0

Legend

Full support  

Full support

See also

• The DOM id global attribute.

Element.id by Mozilla Contributors is licensed under CC-BY-SA 2.5.