Uses htm (Hyperscript Tagged Markup) under the hood and works in all modern browsers. The function html takes a tagged template and processes the AllowedExpressions where falsy values are converted to an empty string and numbers are stringified. The children, who match the id and class selectors marked with an @ sign, will be added to the object this.dom in the process. It adds EventListeners with addEventListener(event, listener.bind(this)), so you don't need to use arrow functions anymore.