A bug in the new course

responsive web design certification, learn html forms by building a registration form, 3rd or 4th lesson:
it says that link element is a self-closing element, I type it right bcz I checked other websites, but it won’t let me proceed, even if it’s right, it shows me the : Sorry, your code does not pass. Keep trying.

If you have a question about a specific challenge as it relates to your written code for that challenge, just click the Ask for Help button located on the challenge. It will create a new topic with all code you have written and include a link to the challenge also. You will still be able to ask any questions in the post before submitting it to the forum.

Thank you.