JSFiddle - React, Tailwind, and code Playground

HTML

<input type="radio" name="l1" value="a1">
<input type="radio" name="l1" value="b1">

<button id="test">Test</button>

JavaScript

const btn = document.querySelector("#test");
const l1 = document.querySelectorAll("input[name='l1']");

btn.addEventListener("click", () => {

  l1.forEach(el => {
    console.log(`${el.value}: ${el.checked}`)
  });

});