Automatically apply tinymce validation to all drupal pages

I seem to have inherited the drupal project, where it seems that a common html validation error occurs on almost every page. The validation error is so small and easy that in fact I only need to open any page in the editor, and the tinymce wysiwig editor will automatically fix the problem, and I will need to save the page. Given that I will need to do this 30k + times to apply it to the entire site, is there a way that it is automatically applied to all pages or automated? Any suggestions are welcome to help me speed up the process.

EDIT: Solution Used

Since I'm not the most skilled at finding a programming solution, I found an add-on for firefox that allows me to record the et loop with iMacros. I launched it in 5 different copies of FF, and let it work all night, and this has already been done halfway. Of course, this is not the most effective way to do something, but it can be a solution for those who, like me, are not so advanced in programming.