Yes of course, I disconnect my machine/s from the web each time I test web designer pages and scripts. Only reconnecting to post to the forum to mention it doesn't work.
Give me a break.
Can't you see that the Xara Designer placeholder method is simplest and does not require any external scripts or excessive third party code added the the <head>

I'm not sure what you are trying to prove here, but when something can be done entirely using the tools provided within the application, it makes no sense to mess around with additional code and external links to .js files, does it?