CDN Link is not open

I am studying for Build a product landing page from Responsive Web Design(
I can not CDN Link provied which is a test page.
Could you fix it please?

That link is for testing.
After you finish your project on Codepen or other similar sites you just add the CDN in a script tag and the test suite will be there on your page.
Edit: it should work even if you work on your local machine on VSCode and spin up a live server.
Like this:
<script src=""></script>

Thanks. it helped!
I shoul work on VSCode and upload it.

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