The web has fundamentally changed since the days of HTML 4.01. The number of people with an internet connection has skyrocketed; recent estimates say that nearly 40% of the world’s population is now online. Bandwidth has also increased dramatically. Even cell phone connections are many times faster and more reliable than those original dial-up connections. Today, browsers are everywhere—phones, tablets, game consoles, televisions, watches, and soon, weird-looking glasses.