What difficulties are faced by self-taught programmers?

Why does this code, written backwards, print “Hello World!”

I found this on the Internet:- class M‮{public static void main(String[]a‭){System.out.print(new char[] {'H','e','l','l','o',' ','W','o','r','l','d','!'});}} This code prints Hello World! onto the screen. Clearly it can be seen public static void mai...

Be honest! How many of you think today's CSS specs by W3C is very restricting?

For example: inability to select the parent element from the child rule is one of the most basic functionalities in CSS which is currently missing. Let's argue.