Overview

Accessibility

A11y features used in dynamic fields of the parametric-dialog, without impacting the current visual layout.

For the dynamic form fields (parametric-dialog), the framework applies these rules:

for="" on labels only when the target control is actually associable (avoids browser warnings on orphan labels).
Semantic fallback: when for is not reliable, aria-labelledby is used on the inner input control.
Stable label id (<field.ang_name>__label) used as A11y reference for complex widgets (p-autoComplete, p-select).
Runtime application of aria-labelledby also after async re-render of PrimeNG widgets.
Dynamic tabIndex propagated to field widgets based on field order in the form.
tabIndex extended also to parametric-dialog toolbar buttons (isEditForm=true) after the last editable field.

A high contrast theme variant is also available, selectable from the theme dropdown (High Contrast Accessibility).

Activates the global class theme-high-contrast on html/body.
Maintains the current layout (no component structure changes), intervening only on color tokens, borders, and focus ring.
Increases foreground/background contrast and makes control borders more visible.
Applies reinforced visible focus (outline with high contrast) for keyboard navigation.
Maintains compatibility with PrimeNG presets already in use (base aura + A11y override).

Reference regulatory targets (Italy/EU):

WCAG 2.1 level AA (contrast criteria, visible focus, and keyboard navigation).
EN 301 549 (European standard for ICT accessibility in the public sector).
Law 4/2004 "Stanca Law" and AGID guidelines (Italian public administration context).

No CSS layout changes required: the interventions are semantic/accessibility-first.
In case of additional custom widgets, expose @Input() tabIndex and (if needed) @Input() ariaLabelledBy.
Recommended verification in DevTools > Issues:

- absence of Incorrect use of <label for=...> warning;

- absence of No label associated with a form field warning;

- keyboard focus order consistent with field/button order.