[stevland]

Most people don’t even know about that file. 

It’s been a long time since I used it, so I thought maybe it was broken.

I added some simple jQuery:

$( "body" ).replaceWith( "<h2>Test is successful</h2>" );

And it worked as expected:

There is something wrong with your code. My console returns this:

Uncaught SyntaxError: Unexpected token '=>'