`input type=radio` element

Pass Criteria

#1: Element is supported
#2: Correct HTML and Core Accessibility API mappings
#3: Correct Accessible Name & Description Calculation

Reference

Test irdo-001: `input type=radio` elements

Test irdo-002: `input type=radio` elements with `label`s & first button checked

Test irdo-003: `input type=radio` elements with `label`s & `disabled` attributes

Test irdo-004: `input type=radio` elements with `label`s, first button `checked`, `fieldset` & `legend`

input type=radio elements with `label`s, first button `required`, `fieldset` & `legend`