Sciter’s script uses block scoped variables as do C, C++, D, Java, etc. JavaScript for some reason uses function scope for variables that creates famous “hoisted variables” problem in JS. In JS they “fixed” the problem by introducing let keyword

There is a menu that you can select. If you copy the files to your own machine you can try the print menu, but on the PWF there are technical reasons why that is not supported, and these lie outside just Java. So select the menu item labelled postscript.