JSX function for creating DOM elements

jsx.js

function jsx(tag, attrs, ...children) {
  let elem = document.createElement(tag);

  for (const attr in attrs) {
    const val = attrs[attr];
    elem.setAttribute(attr, val);
  }

  for (const child of children) {
    if (child instanceof HTMLElement) {
      elem.appendChild(child);
    } else {
      const txt = document.createTextNode(child);
      elem.appendChild(txt);
    }
  }

  return elem;
}

A quick function I wrote for turning JSX into DOM elements. In case you want to
use mostly vanilla JavaScript, but still want to be able to use JSX. Because
JavaScript frameworks are considered harmful.