Native js gets body/id/class/img/li

Get body/id/class/img/li

1. Get body

doucumnet.body
document.getElementsByTagName("body")[0]

2. Get id

document.getElementById("id")

3. Get class

document.getElementsByClassName("class")

4. Get img/li

document.getElementsByTagName("img")
document.getElementsByTagName("li")

HTML DOM Document object

Attach the rookie tutorial address:
https://www.runoob.com/jsref/dom-obj-document.html