My technical docs page fails test 4 and 12

Good day. Help me understand what I’m doing wrong. I have already looked through the code dozens of times, perhaps my eyes have blurred and I do not see the obvious.
My page tech docs.

The test fail messages try to point you in the right direction:

  1. Each element with the class of “main-section” should also have an id comprised of the innerText contained within it, with underscores in place of spaces. The id may include special characters if there are special characters in the respective innerText. (e.g. The that contains the header, “JavaScript & Java”, should have a corresponding id=“JavaScript_&_Java”).

Some “main-section” elements are missing the following ids (don’t forget to replace spaces with underscores!) : ITRODUCTION : expected 1 to equal 0 AssertionError: Some “main-section” elements are missing the following ids (don’t forget to replace spaces with underscores!) : ITRODUCTION : expected 1 to equal 0

Do you see the spelling mistake there?

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Thank you! I hope in the future I will learn to find such oversights myself.

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