Review & complete the ARIA codes

[joseluis]

Reading material & sources:

• https://dequeuniversity.com/assets/html/jquery-summit/html5/slides/landmarks.html
• http://www.w3.org/TR/wai-aria-1.1/
• https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA
  • https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/ARIA_Techniques
• http://oaa-accessibility.org/examples/

[joseluis]

Remove redundant roles. Source:

• ARIA adds nothing to default semantics of most HTML elements
• Aria roles and properties not available as features in HTML