Say you have an element, which you selected using querySelector():

const button = document.querySelector('#mybutton')

You can attach an attribute to it following those steps:

1. create the attribute
2. set its value
3. attach the attribute to the element

Example:

const attribute = document.createAttribute('id')
attribute.value = `remove-${item.name}`
button.setAttributeNode(attribute)

If the element does not exist yet, you have to first create it, then create the attribute, then add the attribute to the element, and finally add the element to the DOM:

const button = document.createElement('button')
const attribute = document.createAttribute('id')
attribute.value = `some-value`
button.setAttributeNode(attribute)
button.textContent = 'Click me'
document.querySelector('.container').appendChild(button)

Lessons in this unit:

0:	Introduction
1:	The `window` object
2:	The `document` object
3:	Types of nodes
4:	Traversing the DOM
5:	Editing the DOM
6:	Selectors API
7:	DOM Ready
8:	Add a class to an element
9:	Remove a class from an element
10:	Check if element has a class
11:	Change a DOM node value
12:	Loop through DOM elements
13:	Add an image to the DOM
14:	▶︎ Create a DOM attribute
15:	Remove children elements
16:	Replace a DOM element
17:	insertAdjacentHTML
18:	Add click events to a list