Are there frameworks to automatically analyse html for accessibility and perhaps provide a certain rating based on set guidelines? I think that might be a very interesting project to work on if such a thing does not exist.
There are automated tools, but in my experience they mostly pick up the easy things (missing alt attributes, etc.) The harder bits are focus and notification in SPAs. Read the WCAG docs [1] and the and WAI ARIA docs [2] stick to them. Then test with a screenreader.
