Basic Proxy usage compatible with Custom Elements, using `append` DOM.next entry

dom.js

// https://jsbin.com/tebevak/edit?js,output
// .append via https://github.com/WebReflection/dom4/#dom4
const dom = new Proxy({}, {
  get(target, property) {
    return function (attrs = {}, ...children) {
      const el = document.createElement(
        property.replace(/[a-z][A-Z]/g, '$1-$2'));
      for (let prop of Object.keys(attrs))
        el.setAttribute(prop, attrs[prop]);
      el.append(...children);
      return el;
    }
  }
});