ARIA Authoring Practices 1.2

Combobox design pattern 1.2 that works with assistive technologies.
New section on communicating value and limits for range widgets.
New section on navigational links using disclosure, menubar and tree widgets.
Unit testing of examples for:
- Keyboard interaction.
- Proper use of ARIA roles.
- Proper use of ARIA properties and states.
Linting code quality:
- HTML code
- CSS code
- Javascript code
High contrast support in new and some updated examples:
- Carousel
- Combobox
- Date Pickers
- Menubar
- Menu Button
- Single-Thumb Slider
- Toolbar
- Treeview Navigation