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
DOM
The 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 Specification
The definition of 'id' in that specification.
Obsolete No change from Document Object Model (DOM) Level 1 Specification.
Document Object Model (DOM) Level 1 Specification
The definition of 'id' in that specification.
Obsolete Initial definition.

Browser compatibility

DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
idChrome Full support 42Edge Full support 12Firefox Full support YesIE Full support YesOpera Full support YesSafari Full support 6WebView Android Full support 42Chrome Android Full support 42Firefox Android Full support YesOpera Android Full support YesSafari iOS Full support YesSamsung Internet Android Full support 4.0

Legend

Full support
Full support

See also

  • The DOM id global attribute.