WPT Roles Tests

/wai-aria/roles/ includes various files broken up by test type

• roles.html covers simple assignment/verification of most core WAI-ARIA roles, and includes a list of cross-references to other specific files and spec directories.
• role testing of host language implicit roles (E.g., <main> -> main) are in other directories (E.g., html-aam)
• role testing of ARIA extension specs are in other directories (E.g., graphics-aria)
• basic.html was the first to ensure basic test coverage of webdriver getcomputedrole
• other context-dependent role tests, error handling, and edge cases are covered in separate files

- list-roles.html - region-roles.html - grid, listbox, menu, tree, etc - fallback roles - invalid roles - error handling, etc.