I didn’t recall there’s such a tool (I could be wrong though). Have you read through the pandoc-extras in pandoc’s wiki page on GitHub? It seems using a post-processor to check and work backward to tweak your template is the way to go. Although pandoc’s output generally is quite good, but pandoc is no linter as it is not designed to be. So I don’t imagine any tool other than post-processor would help. Even if there’s a template designed to conform to a certain requirements, what pandoc writes could break it that requirement. And then pre-processor/filter are even more difficult to do what you need, because it doesn’t see the resultant format.

Does the doc involve math? If you use MathJax, I think it has been built with accessibility in mind.

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