[rapawel]

Thanks for checking it out — and good questions.

You're right: the site is SXG-enabled, and the point of the demo is to show that Google can prefetch and serve it even when you're offline — but only if you search for a specific phrase on Google. Random searches won’t trigger the right preload.

The 4-digit code is intentionally hardcoded — it's not a security check, but a way to make sure the user follows the instructions and gives Google a bit more time to prefetch the content before going offline.

The progress bar also helps with timing — making sure the preload has a chance to complete.

After reading your comment, I added a link to a blog post in the final step of the instructions, in case the demo doesn't work as expected. (If the page is cached from an earlier visit, a refresh helps — it's got a long browser cache.)

Thanks again for digging into it!