A11y | Make the FIB listbox a named keyboard widget

[BrianGenisio]

Summary

The FIB choice menu is a named listbox that keyboard users can open, move through, commit, and dismiss (audit A2, WCAG 2.1.1 / 4.1.2 / 1.4.13).

Closes #31.

Changes

Keep the inline blank and .fib-dropdown / .fib-option markup. The listbox is named with aria-labelledby on the triggering blank (no new copy), and the blank gets aria-controls while the menu is open.

Keyboard matches DS dropdown: arrows wrap, Enter/Space commit, Escape closes and returns focus to the blank. Tab and Shift+Tab also close, because the menu lives on document.body and would otherwise stay open after focus leaves. Options stay non-button role="option" nodes (P2).

Axe aria-input-field-name is gone. Floor is color-contrast 25. Characterization locks the named listbox, aria-controls, and Arrow / Enter / Escape / Tab handlers. A3 empty/filled blank names are unchanged.

Also records A11 as closed (PR #39) on the issue map.

Test plan

• npm test (A2 characterization; A3 still requires blank ${i + 1})
• npm run a11y:ci then WRITE_BASELINE=1 npm run a11y:ci (aria-input-field-name cleared; color-contrast still 25)
• Manual: Tab to an empty blank, Enter, arrows, Enter commits, Escape dismisses, Tab does not leave a stray menu

[coderabbitai]

📝 Walkthrough

Walkthrough

FIB dropdowns now receive generated IDs and ARIA listbox relationships. Keyboard handling supports arrow navigation, Enter, Space, Escape, and Tab. Opening focuses the selected or first option, while closing restores focus to the blank. Options have visible focus styling. Accessibility tests cover the updated semantics and interactions. The axe baseline removes resolved aria-input-field-name violations. The resolution plan records A11 completion and Wave 2 sequencing.

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	The changes satisfy issue #31 by adding naming, keyboard controls, dismissal behavior, and removal of the Axe violation.
Out of Scope Changes check	✅ Passed	The changes remain within issue #31, including implementation, tests, baseline updates, and issue-map tracking.
Title check	✅ Passed	The title clearly summarizes the main change: making the FIB listbox named and keyboard-operable.
Description check	✅ Passed	The description accurately explains the accessibility, keyboard interaction, testing, and issue-map changes.

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[coderabbitai]

Actionable comments posted: 2

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Inline comments:
In `@a11y-audits/8-13-26/resolution-plan.md`:
- Line 253: Update the resolution plan entries for PR `#39` to associate it with
A2 (`#31`), mark A2 closed, and leave A11 open unless the matching.js remediation
is included; revise the corresponding next-step text to reflect the corrected
audit status.

In `@public/modules/fib.js`:
- Around line 184-186: Update the keyboard handling around the Escape/Tab branch
to handle the keys separately: keep Escape calling dismissMenu() with its
existing focus restoration, but on Tab close the menu without restoring focus to
the blank and preserve normal forward or Shift+Tab navigation direction.

🪄 Autofix

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

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Run ID: c11f3aac-f41a-4899-9c69-6e10734a9d0e

📥 Commits

Reviewing files that changed from the base of the PR and between 7bc694b and 0a5e289.

📒 Files selected for processing (5)

• a11y-audits/8-13-26/resolution-plan.md
• a11y-audits/tools/axe-baseline.json
• public/modules/fib.css
• public/modules/fib.js
• test/a11y-characterization.test.js

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