Our registration form wizard used a mix of inaccessible default browser error messages and ambiguous custom form validation messages in red text.
Identify input purpose (autocomplete values) makes easier and faster form filling experiences for everyone entering personal or payment information.
Setting input width to guide sighted users reduces cognitive effort needed to fill out forms. I’ve created HTML and CSS code to set width of a postcode field.
In September 2018 I conducted manual accessibility testing on the first iteration of member registration as a form wizard. This was my lightning talk.