If you're serious about JSX like strings or XML like template literals to produce valid and expected HTML, this is your one stop shop:

• it's strictly XML compliant, it uses the XML parsing option indeed
• errors are embedded and shown/described on the page when these happen
• attributes require a value, even if empty (i.e. <input disabled="" />)
• it's a template tag, hence it can be used as x([xhtml]) too
• it doesn't promote Custom Elements out of the box, you need to document.importNode(x(['<x-foo />']), true) explicitly, if that's a desired outcome before the node goes live
• the @webreflection/x/custom export allows you to pass a document, a DOMParser, and a transform utility for your interpolations. All have a default globalThis value, the transform does nothing if not specified.
• the @webreflection/x/path export allows you to parse without caring about attributes quoted boundaries, it is compatible with SVG nodes, and it's not a tag function but it accepts template like references and an svg bolean parameter to let you parse and retrieve a [fragment, paths] result, where the fragment is the one containing the list of elements and the paths is an array of { type, name, path } references that matches the values you might have gotten via your own tag based function, basically replacing 3 dependencies from uhtml

import x from '@webreflection/x';

document.body.appendChild(
  x`<span /><span />`
);

document.body.innerHTML;
// <span></span><span></span>

import customX from '@webreflection/x/custom';

const x = customX({
  transform: attribute => `"${attribute}"`
});

document.body.appendChild(
  x`<span test=${1} /><span />`
  //           ^  ^ no quotes around
);

document.body.innerHTML;
// <span test="1"></span><span></span>

// exports: html, svg, update, skip, x
import { html, svg, update } from '@webreflection/x/node';

const fragment = x`<span test=${1} /><span />`;

document.body.appendChild(fragment);

document.body.innerHTML;
// <span test="1"></span><span></span>

setTimeout(update, 1000, fragment, [2]);
// will update test attribute as 2

That's literally it 😇