This change causes explicit role=none and role=presentation attribute
values to be ignored in cases where the elements for which those values
are specified are either focusable, or have global ARIA attributes —
per https://w3c.github.io/aria/#conflict_resolution_presentation_none.
This change implements the role-checking requirement from the ARIA spec
at https://w3c.github.io/aria/#document-handling_author-errors_roles
that the “form” and “region” roles are required to have accessible
names — and that if they don’t have accessible names as required, UAs
must treat them as if they’d not been specified at all.
This change causes explicitly-specified role attributes to be ignored in
the case where the specified role is “orphaned” — that is, when its
element lacks a required ancestor with an appropriate role.
This change does replacement of ARIA roles that have newer synonyms.
There are a number of newer ARIA roles that are synonyms for older
roles. https://wpt.fyi/results/wai-aria/role/synonym-roles.html has a
number of subtests which expect that when retrieving the value of an
explicitly- specified role attribute, if the value is one of the older
role values, implementations must replace that with its newer synonym.
This change aligns the default roles for “th” and “td” elements with the
requirements in the HTML-AAM spec, and with the corresponding WPT tests
at https://wpt.fyi/results/html-aam/table-roles.html, and with the
behavior in other engines.
Otherwise, without this change, the default role values for “th” and
“td” elements in some cases don’t match the behavior in other engines,
and don’t match the expected results for the corresponding WPT tests.
This change takes the change we made in 120bc52f23 to patch the imported
WPT aria-utils.js file to use our window.internals.getComputedLabel(el)
function, and moves that patching into the imported WPT testdriver.js
file — in the same way we did in c5966bbdcb.
That centralizes the patching, and avoids the need to patch multiple
other WPT tests we’re likely to import eventually. There are actually
six different WPT test files upstream which we haven’t imported yet that
call window.test_driver_internal.get_computed_label(el) directly — and
that, without this change, we’d otherwise end up needing to patch.
This change imports the WPT accname/name/comp_embedded_control.html
test, along with related resources files it depends on.
Note that in the wai-aria/scripts/aria-utils.js file, this changes the
get_computed_label call to use our window.internals.getComputedLabel.
