JSFiddle - React, Tailwind, and code Playground
HTML
<input type="text">
<input type="text">
JavaScript
var input = document.getElementsByTagName("input");
for (i = 0, len = input.length; i < len; i++) {
console.log('this');
input[i].style.backgroundColor = "#dbb";
input[i].style.border = "1px solid #d00";
input[i].setAttribute("class", "test");
input[i].className = "test_two";
input[i].id = 'test';
}