accessibility

i'd like to create custom view and provide for talkback information about type, state and may be short description of this view.
how i can to do it?

Anyone knows anything about, how to implement accessibility in Angular 2 with Typescript?

Suppose I set a custom validity message for a field using setCustomValidity() to describe why a form field is not valid. Would this content be available to users using assistive technology?

What's the most/correct accessible way to use headings in a web modal window?

If i have same navigation on 2 places in every page , one is in dropdown and again is in left sider bar will it create difficulties for screen reader user?

I am using AccEvent.exe and want to extract text from the line where my caret is positioned in any window. Which Events and Object Properties in AccEvent.exe should I use?

I started reading upon html5 and I am trying to work on a project so that I can see how things work. I know that the tag can be use like this:

I have a Burger Menu Button which is selectable via TAB. When I click on it and the menu opens up the burger has this blue outline to make it clear that it is focused.

In my code I have a list of buttons stored in an unordered list.

I have: