At the moment Eva Papst ( blind) is sitting beside me and we are going to check the Joomla installation with different screenreaders.
The first prob was that the webformator doesn’t show onclicks without href, so we have to change to window eyes , there it works.
These links aren’t reachable for keyboard users too.
Structure and Navigation are logical and useable.
Form elements are labeled and working.
It should be better to position the continue button after the form-fields.
Result: Installation successfully finished
Now we continue with step 2 and report later.