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.


A string.


DOM Standard
# ref-for-dom-element-id①

Browser compatibility

BCD tables only load in the browser

See also

  • The DOM id global attribute.