createFragment

createFragment.js

function createFragment(markup) {
  const fragment = document.createRange().createContextualFragment(markup);
  return fragment.firstChild;
}

const btnContainer = createFragment(`
  <div class="container">
    <button>Click Me</button>
  </div>
`)

const btn = btnContainer.querySelector('button');
btn.addEventListener('click', (event) => console.log(event));