The "Try it out" page doesn't work

Here's what I did

1. Open the Try it out page with Firefox 135.0.1 on Windows 11
2. Click the "Correct errors using --fix" button

What I expected to happen

The button says "Correct", so I expect the code shown in the left of the button is corrected.
At least, the code has semicolons and the rule isn't allowing them, so they should be removed.
Another possibility is the code is checked against the rules and some warnings are shown (without automatic fix).

Also, the page says

Press "Format Code" to reformat code automatically!

therefore there should be the "Format Code" to press.

What seems to have happened

Nothing look happening on the page. The code isn't changed and no messages are shown.
Also I couldn't find the "Format Code" to press. (I tried clicking "Format Code" on the text, but it seems resulting in nothing.)

Using the developper tool, there seems some requests to

• https://standardizer.glitch.me/lint
• https://standardizer.glitch.me/fix

It says that the requests are blocked due to CORS information.
However, setting my browser to ignore CORS restrictions didn't improve the behavior.
It says not only that the requests are blocked due to CORS, but also 404.
It looks like the service behind this page has been shut down.