Update FieldInput aria #9656
Description
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Problem
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Request
FieldInput will be set up to provide a strong foundation for ARIA support in implementation classes by:
Introducing automatic mechanisms to ensure that FieldInputs have a reasonable default role and up-to-date label.
Relying on implementations to provide accessible editor support.
The former is done by introducing a new private recomputeAriaLabel() helper that:
Sets the main focusable element's role to aria.Role.BUTTON (see section 2).
Sets the main focusable element's aria-label to the result of computeAriaLabel (without type information by default).
Sets the main focusable element to aria-hidden if it's part of the flyout (no fields should be part of the accessibility node tree in that case since they're not navigable).
FieldInput will also be configured to automatically recompute its aria-label when:
The field is first initialized (initView is called).
When a valid value is updated in the field (doValueUpdate_).
When an invalid value is attempted to be set and triggers a revert (doValueInvalid_).
Alternatives considered
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Additional context
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