id property


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.


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

idStr is the identifier of the element.