Build a Markdown Previewer: Help and Feedback

Build a Markdown Previewer: Help and Feedback
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#1

Help i don’t understand why it doesn’t show up on codepen: https://codepen.io/mav1283/pen/oMBRXZ?editors=0010
but shows up in codesandbox: https://codesandbox.io/s/3rmymxno4p

Also i keep getting error: marked is not defined and the tables are not showing up, the marked documentation lacks some instructions how the markdown works, here’s the full page view in code sandbox: https://3rmymxno4p.codesandbox.io/ i think i got it right but keeps getting errors.

Your code so far

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.103 Safari/537.36.

Link to the challenge:
https://learn.freecodecamp.org/front-end-libraries/front-end-libraries-projects/build-a-markdown-previewer/