Show HN: Hmpl – work with server-side HTML with ease

But also you don't need much more than those lines of JS:

  document.addEventListener('DOMContentLoaded', () => {
    const t = document.querySelector('template[data-hmpl]');
    t && fetch(t.dataset.src, { method: t.dataset.method })
    .then(res => res.text())
    .then(html => t.outerHTML = \`<div>\${html}</div>\`)});