Tribute-page check with VS Code

I am using VS Code. Finished my tribute page, but don’t know how to be checked.
Not understand part with CDN link.

Can you explain me how to use CDN link?

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Challenge: Build a Tribute Page

Link to the challenge:

While you can certainly develop your projects locally using VSCode (or any other editor), in order to submit the project it will need to be live online. You can use CodePen for this or a similar service. The CDN link is how you can include the test suite in your project. If you fork the CodePen starter, it will already be there, but if you don’t fork from CodePen then you will need to include it manually

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