What's wrong with my Markdown Previewer?

Tell us what’s happening:
Hi~ I am trying to build the markdown previewer. It seems working fine but when running the test, I can’t pass these:

User Story #3:**  When I enter text into the  `#editor`  element, the  `#preview`  element is updated as I type to display the content of the textarea.
User Story #4:**  When I enter GitHub flavored markdown into the  `#editor`  element, the text is rendered as HTML in the  `#preview`  element as I type (HINT: You don't need to parse Markdown yourself - you can import the Marked library for this: https://cdnjs.com/libraries/marked).

Would someone please check my page for me? Thanks a lot!!
Btw, I used chrome to run codepen.

My codepen page: links

Your code so far

Your browser information:

User Agent is: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_6) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.0.3 Safari/605.1.15.

Challenge: Build a Markdown Previewer

Link to the challenge: