With HTTP2 you can add files to a request, if the user requests index.htm you can also send style.css in the same response. Versus the user first requesting ind

With HTTP2 you can add files to a request, if the user requests index.htm you can also send style.css in the same response. Versus the user first requesting index.htm, parses it, then request style.css. It's a pretty new feature, and will help a little bit with latency as it can save a round-trip. Wireless connections have had bad latency, but it's getting better. 15 years ago you could get 200+ ms latency on WiFi. today we are down to around 10-20ms. 15 years ago we only had 100Mbit fiber. If you live in a city today you can get 10Gbe. Meanwhile there are people surfing using satellite up-link, or very poor GSM, so there are strong contrasts. But they probably wont bother loading any CSS (which makes semantic HTML important).