Google web developer page, has documentation on PWA apps

Transform web DOM to sbg and render to webgl

Transfer program output through a websocket

Enter the URL of the website you want to test at low bandwidths, then select the bandwidth you want to simulate

Plus how to run a web application when the JavaScript itself is disabled*.

If you do web development, you’ve probably heard of REST. But if you’re like me, you usually just pretend to know what it is, and nod politely when someone asks you if what you’re making is RESTful. I use HTTP, err, that means it’s RESTful right?

It takes a 'snapshot' of a webpage that will always be online even if the original page disappears.
This can be useful if you want to take a 'snapshot' a page which could change soon: price list, job offer, real estate listing, drunk blog post, ...