As was noticed on habrahabr it is not "pure" javascript as it requires document object. Neither is

console.log("Hello World!");

As it requires console object. So we are left only with

throw "Hello World"

"Show HN: 30 lines of pure JavaScript in 30 lines of pure JavaScript" :)

Do you think you could shorten this down to less than one line? One line seems wasteful.

The other developers were actually able to do negative lines. Can you do this?

Would be great through js2js[1]

[1] http://eleks.github.io/js2js/

Mystical.

Smart. You realised the trend.

Genius :)