Single HTML files are a nice unit of component for building UIs. See the BrickLink store-front. Each part is defined in its own HTML file and then these are con

Single HTML files are a nice unit of component for building UIs. See the BrickLink store-front. Each part is defined in its own HTML file and then these are concatenated before being served. At dev time each component can be put through its paces in isolation ("explore the characteristic state space"). At runtime you can `clone()` the DOM to make more, modify it and so on. It worked really well.