It's because of the mentality that things should be open and inspectable that we have things like browser devtools (thanks Firebug!), that is something we still

It's because of the mentality that things should be open and inspectable that we have things like browser devtools (thanks Firebug!), that is something we still use today to learn and troubleshoot. Sometimes it makes it harder when people use various compile-to-js/css languages, but also sometimes people ship their sourcemaps and again we can learn from examples. Or we try to reverse-engineer it, which is another valuable skill. I didn't mean to say this is the only way of learning, but I stand firm on that it's still a great way to learn, to look at how cool stuff was done when you come across it on real websites, not just from blog posts describing something. In addition to reading fundamentals, practicing small projects and so on, of course.