List all testable changes to accessibility APIs related to changes in ARIA 1.3 from ARIA 1.2

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https://www.w3.org/TR/wai-aria-1.3/#major-feature-in-this-release

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The following tests cover most of the changes in CORE-AAM related to changes in ARIA 1.3:

• https://github.com/web-platform-tests/wpt/blob/master/core-aam/aria-brailleroledescription-manual.html
• https://github.com/web-platform-tests/wpt/blob/master/core-aam/aria-brailleroledescription_is_empty-manual.html
• https://github.com/web-platform-tests/wpt/blob/master/core-aam/aria-description-manual.html
• https://github.com/web-platform-tests/wpt/blob/master/core-aam/mark-manual.html
• https://github.com/web-platform-tests/wpt/blob/master/core-aam/comment-manual.html
• https://github.com/web-platform-tests/wpt/blob/master/core-aam/suggestion-manual.html
• https://github.com/web-platform-tests/wpt/blob/master/core-aam/aria-braillelabel-manual.html
• https://github.com/web-platform-tests/wpt/blob/master/core-aam/form-unnamed.html
• https://github.com/web-platform-tests/wpt/blob/master/core-aam/region_without_an_accessible_name-manual.html

But the following two changes do not have a related test:

• Update aria-details to allow multiple IDrefs Update aria-details aria#1136
• Add role=image as synonym for role=img (#1370) Add role=image as synonym for role=img aria#1370