HTML5 input validation

The greatest promise around 2012 was the client-side validation of input fields. After about 10 years, there is still room for improvement. Especially when it comes to accessibility.

Findings

These are findings collected for years. In some cases browsers are improved, so some of my findings might be obsolete.

Browser issues

Are these issues still open? It's hard to find out if there are more open issues and if my findings above are known issues.