Fix a11y issues in file upload component

[fateeand]

Fixing accessibility issues in file upload component

Validation rules:

Validated using Playwright accessibility tests, Lighthouse tool, axe DevTools extension, Accessibility Insights for Web extension, and manual checks including keyboard tab navigation and screen reader testing.

Full doc with rules

---

Playwright axe-core validation results:

State before:

Component	button-name	color-contrast	label
File upload	-	✅	❌

---

State after:

Component	button-name	color-contrast	label
File upload	✅	✅	-

---

Checklist

• Keyboard Navigation
  All interactive elements are fully operable via keyboard only, including buttons, inputs, menus, dialogs, sliders, drag-and-drop, tree views, multi-selects, and composite widgets. No traps or dead ends.

• Focus Management
  Focus is visible, logical, moves in predictable order, trapped where necessary (modals/popovers), and restored after closing. Focus is perceivable in all interactive widgets.

• Semantics / ARIA

  • Semantic HTML is used correctly.
  • ARIA roles, states, and properties are applied only when needed.
  • All form fields, tables, and widgets (including autocomplete, tree selects, tree tables, drag-and-drop, sliders, and multi-selects) are properly labeled and accessible.

• Color / Contrast

  • Text and interactive elements meet contrast requirements (≥4.5:1 normal text, ≥3:1 large text).
  • Focus and selection indicators are visually perceivable.
  • Color is not the only indicator of state.

• Screen Reader / Assistive Technology

  • All content, labels, and dynamic updates are perceivable via screen readers.
  • Live regions announce status messages, alerts, modals, notifications, and dynamic changes.
  • Interactive widgets provide proper announcements of selection and updates.

• Responsive & Zoom

  • Components function correctly and remain readable at all viewport sizes and up to 200% zoom, including mobile and touch devices.
  • Prefer em/rem units over px where scaling is required.

• Error Handling

  • Errors are clearly identified visually and programmatically.
  • Form inputs use aria-describedby or aria-invalid for inline messages.
  • Instructions and suggestions are accessible.

• Dynamic Content / Updates

  • Status updates, alerts, notifications, and modals use live regions.
  • Updates do not disrupt focus or user control unexpectedly.

• Interaction Feedback / States

  • All interactive states (hover, focus, active, disabled, drag-and-drop, reordering, multi-select) are visually perceivable.

• [N/A] Authentication & Sensitive Actions

  • Inputs and actions involving sensitive data provide accessible instructions, feedback, and error messages.

• Predictable & Controllable UI

  • Components behave consistently and predictably.
  • Popups, modals, autocomplete suggestions, drag-and-drop, and dynamic content allow user control.

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Release notes:

• Fix a11y issues in file upload component

[github-actions]

Coverage report for library

St.❔	Category	Percentage	Covered / Total
🔴	Statements	30.51%	2010/6587
🔴	Branches	24.6%	733/2980
🔴	Functions	26.2%	372/1420
🔴	Lines	31.33%	1898/6058

Test suite run success

453 tests passing in 22 suites.

Report generated by 🧪jest coverage report action from 33f9f83

[github-actions]

Playwright test results

 48 passed

Details

 48 tests across 4 suites
 1 minute, 14 seconds
 33f9f83
 For details, download the Playwright report

[Copilot]

Pull request overview

This PR addresses accessibility gaps in the cps-file-upload component by improving its accessible name/disabled behavior, adding clearer processing/error UX, and enabling automated a11y scanning for the component page.

Changes:

• Adds accessibility and UX enhancements to cps-file-upload (aria label, disabled state, keyboard interactions, error feedback, processing lifecycle events).
• Updates styling for clearer focus/disabled/error states and rem-based sizing.
• Enables Playwright axe scans for the file upload page and updates composition examples/docs data accordingly.

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
projects/cps-ui-kit/src/lib/components/cps-progress-linear/cps-progress-linear.component.ts	Recomputes resolved colors on input changes for dynamic theme/token updates.
projects/cps-ui-kit/src/lib/components/cps-file-upload/cps-file-upload.component.ts	Adds new inputs/outputs and drag/drop + processing/error state handling.
projects/cps-ui-kit/src/lib/components/cps-file-upload/cps-file-upload.component.html	Improves semantics (button), live announcements, disabled/processing UI, and keyboard removal action.
projects/cps-ui-kit/src/lib/components/cps-file-upload/cps-file-upload.component.scss	Adds focus ring, disabled/error styling, and rem-based sizing updates.
projects/composition/src/app/pages/file-upload-page/file-upload-page.component.ts	Updates demo logic to exercise new events, disable toggling, and state reset on extension changes.
projects/composition/src/app/pages/file-upload-page/file-upload-page.component.scss	Adds layout styling for the new demo sections.
projects/composition/src/app/pages/file-upload-page/file-upload-page.component.html	Expands examples to include aria label, disabled state, and processing events; updates sizing units.
projects/composition/src/app/pages/divider-page/divider-page.component.scss	Aligns section title color with updated design token usage.
projects/composition/src/app/api-data/cps-file-upload.json	Documents new ariaLabel, disabled, fileProcessed, and fileProcessingFailed API surface.
playwright/cps-accessibility.spec.ts	Enables axe scanning for the file upload route/component.

[lukasmatta]

great job!