let b = document.body,

    p1 = document.querySelector('p');

​

// reading node values

console.log(b.nodeValue); // null for all elements

console.log(b.attributes[0].nodeValue); // "home"

console.log(b.childNodes[7].nodeValue); // " comment text "

​

// changing nodeValue of first node inside first paragraph

p1.firstChild.nodeValue = "inserted text<br>";

console.log(p1.firstChild.nodeValue);