I have a simple index.html that embeds another single-page form through an iframe. On that embedded page, the JavaScript meant to validate the input fields is no longer firing, so users can submit empty or badly formatted data without any warning. The task is straightforward: trace why the input-level checks fail, repair the script, and return the page fully functional inside the iframe. Everything is written in plain vanilla JavaScript, no external libraries, and I want to keep it that way. To wrap up the job, send back the corrected HTML/JS file along with a short comment block or note describing what you changed and why, so I can learn from the fix and replicate it elsewhere if needed.