HTML DOM Element id

Get the id of the first anchor:

let id = document.getElementsByTagName("a")[0].id;

Change the id of an element:

document.getElementById("demo").id = "newid";

Change the font size of "myP":

const element = document.getElementById("myP");
element.style.fontSize = "30px";

Description

The id property sets or returns the value of an element's id attribute.

An id should be unique within a page.

Return the id property:

element.id

Set the id property:

element.id = id

Value	Description
id	The id of the element.

Type	Description
String	The id of the element.

element.id is supported in all browsers:


Chrome	Edge	Firefox	Safari	Opera	IE
Yes	Yes	Yes	Yes	Yes	Yes