документ получить элемент по тегу
var list = document.getElementsByTagName("UL")[0];
list.getElementsByTagName("LI")[0].innerHTML = "Milk";
Awesomered989
var list = document.getElementsByTagName("UL")[0];
list.getElementsByTagName("LI")[0].innerHTML = "Milk";const btns = document.getElementsByTagName('button');
const btnFirst = btns.item(0);
// to get an item for the HTML collection use indexing, like arrays start
// at index 0
const btnNamed = btns.namedItem('named-btn');
// to get a named item you can use both id & name attributes
btnFirst.onclick = () => {
console.log('The first item in the collection');
}
btnNamed.onclick = () => {
console.log('A named item in the collection');
}