WCAG 2.1 AA/AAA Accessibility Audit & Engineering Remediation
Remediating complex financial calculator widgets, focus traps, and 400% zoom reflow for ADA compliance.
The client faced legal ADA exposure due to inaccessible multi-step loan calculators, keyboard trap modals, low-contrast UI widgets, and complete failure under 400% zoom reflow.
Remediating custom dynamic JavaScript slider widgets, financial charts, and modal authentication dialogs to meet strict WCAG 2.1 AA/AAA criteria without redesigning the brand's visual identity.
Achieved 100% WCAG 2.1 AA and targeted AAA compliance across all customer-facing mortgage and lending tools. Mitigated legal exposure and improved form completion rates by 19%.
Automated Axe Core scans flagged 142 distinct violations; manual screen-reader auditing with NVDA and VoiceOver revealed that screen-reader users could not increment loan term sliders or perceive dynamic interest rate recalculations.
Rebuilt interface components using WAI-ARIA authoring practices, native `<dialog>` overlays with strict focus trapping, `aria-live='polite'` calculation announcement regions, and fluid CSS clamp layouts.
Engineered keyboard-navigable dual-handle sliders with `role='slider'` and `aria-valuenow`, implemented high-contrast focus rings with minimum 3:1 contrast against adjacent colors, resolved two-dimensional table scrolling, and refactored form inputs with explicit labels and error associations.
Rigorous testing with NVDA (Windows), VoiceOver (macOS/iOS), JAWS, full keyboard-only navigation workflows, color contrast analyzers, and browser zoom stress testing up to 400%.
Project Context
A regional commercial bank with over $1.2B in assets was issued an ADA demand letter citing inaccessible online lending calculators. They required rapid, uncompromising engineering remediation of their entire digital mortgage application pipeline.
The Technical Deficiencies
- Interactive Slider Failure: The dynamic loan amount slider was constructed using non-semantic
<div>elements with mouse-onlymousedownandmousemovelisteners. Keyboard users could not alter values. - Missing Calculation Announcements: When a user modified loan terms, the calculated monthly payment updated visually on screen, but assistive technologies received zero notification.
- Reflow Collapse: At 400% zoom (1.4.10 Reflow), the multi-step calculator collapsed horizontally, clipping the “Submit Loan Application” button completely off-screen.
Engineering Remediation
1. Accessible Custom Slider with ARIA Semantics
<div
role="slider"
tabindex="0"
aria-label="Loan Amount in Dollars"
aria-valuemin="50000"
aria-valuemax="2000000"
aria-valuenow="450000"
aria-valuetext="$450,000"
class="relative h-2 bg-dark-elevated rounded-full focus-visible:ring-2 focus-visible:ring-brand"
>
<div class="h-full bg-brand rounded-full" style="width: 22.5%;"></div>
<div class="absolute top-1/2 -translate-y-1/2 -translate-x-1/2 w-6 h-6 bg-brand rounded-full cursor-grab"></div>
</div>
2. Real-Time Polite Calculation Announcements
<div
aria-live="polite"
aria-atomic="true"
class="sr-only"
id="calculator-announcer"
>
Monthly payment calculated: $2,845 per month at 6.2% interest.
</div>
Validation & Certifications
- Passed independent third-party accessibility audit with 0 critical or moderate severity issues remaining.
- Complete keyboard operable verification: Tab, Shift+Tab, Arrow keys, Home, End, Escape, and Enter all perform standardized native behaviors.