May 05, 2021 · Codepen "not found" error. JSchref May 5, 2021, 5:25pm #1. I completed my JS algorithms and data structures certification, but I wanted the experience of making a mini-site with them on codepen. I’m stuck on the “Palindrome Checker.”. The JS works, however every time I submit the text to be checked, CodePen throws an error.
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