JAVASCRIPT

How to iterate over the DOM

// Note: This will only work in platforms that have
// implemented NodeList.prototype[Symbol.iterator]
const articleParagraphs = document.querySelectorAll('article > p');

for (const paragraph of articleParagraphs) {
  paragraph.classList.add('read');
}

loop through dom elements javascript

//Loop thru DOM elements

var all = document.getElementsByTagName("*");

for (var i=0, max=all.length; i < max; i++) {
     // Do something with the element here
}