There's a large gap between basic understanding of CSS and actually creating good CSS. Personally I avoid touching CSS as much as possible.

I don't really see when I would use the this. When I have JAR with unknown contents and I want to see version and dependencies of it?

At a guess, may be useful when:

* Working with old enterprise libraries ("just use the jar!")

* Optimisation when dealing with a compile to JVM language like Closure or Scala

* Research, such as reverse engineering badly behaved jars.

Not really sure why this would be helpful only with Scala in this case. Scala is not transpiled, it's compiled directly to bytecode just like Java so if it was helpful with Scala it should be helpful with Java as well.

Using the latest daily build of chromium I couldn't reproduce a single one of the "issues" that the post presented.

It seems they've all been fixed before he wrote the post.