Setting aside subjective reasons... how about the barrier for entry being lower for web development? Also, more people arguably have web development skills
Java isn't new or unpopular- if people wanted to use it, they would
Java isn't new or unpopular- if people wanted to use it, they would
Many IDEs have some sort of visual GUI layout tool, but the nature of HTML+CSS makes it a far leakier abstraction less suited to visual positioning.