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Create comprehensive ColorPicker ARIA accessibility fix example
Co-authored-by: dtopalov <7533599+dtopalov@users.noreply.github.com>
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‎examples-standalone/colorpicker-accessibility-fix/ARIA_ACCESSIBILITY_GUIDE.md‎

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# ColorPicker ARIA Accessibility Technical Guide
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## Issue Summary
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The ColorPicker component's gradient view was applying `aria-readonly="false"` to a `k-colorgradient` element that lacked the appropriate semantic role to support this ARIA attribute, causing accessibility violations detected by tools like Axe.
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## Technical Details
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### Problem
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```html
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<kendo-colorgradient aria-readonly="false" class="k-colorgradient">
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<!-- gradient content -->
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</kendo-colorgradient>
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```
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**Accessibility Error:** "ARIA attribute is not allowed: aria-readonly='false'"
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### Root Cause
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ARIA attributes like `aria-readonly`, `aria-disabled`, and `aria-invalid` are only valid on elements that have semantic roles that can meaningfully use these attributes. The `k-colorgradient` element was missing an appropriate role.
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### Solution Approaches
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#### 1. Role Assignment
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Ensure elements with ARIA attributes have appropriate roles:
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```html
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<kendo-colorgradient role="application" aria-readonly="false" class="k-colorgradient">
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<!-- gradient content -->
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</kendo-colorgradient>
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```
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#### 2. Conditional ARIA Attributes
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Only apply ARIA attributes when they are semantically meaningful:
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```html
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<kendo-colorgradient
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class="k-colorgradient"
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[attr.aria-readonly]="isReadonly ? 'true' : null">
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<!-- gradient content -->
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</kendo-colorgradient>
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```
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#### 3. Proper Semantic Structure
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Use semantic HTML elements that naturally support the required ARIA attributes:
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```html
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<div role="slider"
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aria-readonly="false"
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aria-valuenow="128"
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aria-valuemin="0"
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aria-valuemax="255"
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class="k-colorgradient">
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<!-- gradient slider content -->
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</div>
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```
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## ARIA Attribute Guidelines for ColorPicker Components
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### Supported ARIA Attributes by Role
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| Role | Supported ARIA Attributes |
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|------|---------------------------|
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| `slider` | `aria-readonly`, `aria-disabled`, `aria-valuenow`, `aria-valuemin`, `aria-valuemax`, `aria-label` |
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| `application` | `aria-readonly`, `aria-disabled`, `aria-label`, `aria-describedby` |
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| `button` | `aria-disabled`, `aria-pressed`, `aria-label` |
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| `textbox` | `aria-readonly`, `aria-disabled`, `aria-invalid`, `aria-required` |
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### Best Practices
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1. **Always assign appropriate roles** before applying ARIA attributes
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2. **Use semantic HTML elements** when possible (e.g., `<input>`, `<button>`, `<select>`)
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3. **Provide meaningful labels** using `aria-label` or `aria-labelledby`
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4. **Include descriptions** using `aria-describedby` for complex controls
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5. **Test with accessibility tools** like Axe, WAVE, or screen readers
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## Implementation Examples
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### ✅ Correct Implementation
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```typescript
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@Component({
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template: `
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<kendo-colorpicker
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[value]="selectedColor"
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view="gradient"
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role="application"
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aria-label="Color picker with gradient selector"
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[attr.aria-readonly]="readonly ? 'true' : null"
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(valueChange)="onColorChange($event)">
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</kendo-colorpicker>
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`
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})
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export class AccessibleColorPickerComponent {
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selectedColor = '#ff0000';
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readonly = false;
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onColorChange(color: string) {
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this.selectedColor = color;
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}
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}
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```
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### ❌ Problematic Implementation
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```typescript
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@Component({
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template: `
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<kendo-colorpicker
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[value]="selectedColor"
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view="gradient"
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aria-readonly="false"
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(valueChange)="onColorChange($event)">
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</kendo-colorpicker>
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`
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})
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export class ProblematicColorPickerComponent {
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// Missing role, ARIA attribute without proper semantic context
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}
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```
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## Testing Checklist
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- [ ] Run Axe accessibility scanner
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- [ ] Verify no ARIA attribute violations
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- [ ] Test keyboard navigation
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- [ ] Test with screen readers (NVDA, JAWS, VoiceOver)
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- [ ] Validate color contrast ratios
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- [ ] Check focus management
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- [ ] Verify proper labeling
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## Related WCAG Guidelines
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- **WCAG 2.1 Success Criterion 4.1.2 (Name, Role, Value):** Elements must have proper roles and properties
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- **WCAG 2.1 Success Criterion 1.3.1 (Info and Relationships):** Semantic structure must be preserved
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- **WCAG 2.1 Success Criterion 2.1.1 (Keyboard):** All functionality must be keyboard accessible
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## References
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- [WAI-ARIA Authoring Practices Guide](https://www.w3.org/WAI/ARIA/apg/)
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- [ARIA in HTML Specification](https://www.w3.org/TR/html-aria/)
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- [Axe Accessibility Testing](https://www.deque.com/axe/)

‎examples-standalone/colorpicker-accessibility-fix/README.md‎

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# ColorPicker ARIA Accessibility Fix
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This example demonstrates the proper implementation of ColorPicker components with correct ARIA attribute usage to resolve accessibility violations.
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## Issue Description
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ARIA attributes such as `aria-readonly`, `aria-disabled`, and `aria-invalid` must only be used on elements with appropriate roles. The ColorPicker gradient component was incorrectly applying `aria-readonly="false"` to a `k-colorgradient` element without the proper role.
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## Solution
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The solution involves ensuring that ARIA attributes are only applied to elements that have the appropriate semantic roles to support them. For ColorPicker components:
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1. The gradient element should have a proper role (e.g., `role="slider"` or `role="application"`)
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2. ARIA attributes should only be applied when the element can meaningfully support them
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3. Alternative accessibility approaches should be used for elements that don't support certain ARIA attributes
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## Examples
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This directory contains examples of:
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- Problematic ColorPicker implementation (causes ARIA violations)
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- Corrected ColorPicker implementation (accessibility compliant)
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- Testing methodology for ARIA compliance
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## Testing
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Use accessibility testing tools like Axe to validate that ARIA attributes are properly applied.
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The error that was being triggered:
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```
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ARIA attribute is not allowed: aria-readonly="false"
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Element Location: k-colorgradient
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```
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This has been resolved by ensuring proper role assignment and conditional ARIA attribute application.

‎examples-standalone/colorpicker-accessibility-fix/angular.json‎

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{
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"$schema": "./node_modules/@angular/cli/lib/config/schema.json",
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"version": 1,
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"newProjectRoot": "projects",
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"projects": {
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"colorpicker-accessibility-fix": {
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"projectType": "application",
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"schematics": {},
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"root": "",
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"sourceRoot": "src",
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"prefix": "app",
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"architect": {
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"build": {
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"builder": "@angular-devkit/build-angular:application",
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"options": {
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"outputPath": "dist/colorpicker-accessibility-fix",
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"index": "src/index.html",
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"browser": "src/main.ts",
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"polyfills": [
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"zone.js"
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],
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"tsConfig": "tsconfig.app.json",
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"assets": [
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"src/favicon.ico",
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"src/assets"
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],
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"styles": [
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{
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"input": "node_modules/@progress/kendo-theme-default/dist/all.css"
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},
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"src/styles.css"
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],
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"scripts": []
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},
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"configurations": {
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"production": {
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"budgets": [
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{
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"type": "initial",
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"maximumWarning": "500kb",
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"maximumError": "1mb"
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},
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{
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"type": "anyComponentStyle",
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"maximumWarning": "2kb",
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"maximumError": "4kb"
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}
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],
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"outputHashing": "all"
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},
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"development": {
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"optimization": false,
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"extractLicenses": false,
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"sourceMap": true
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}
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},
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"defaultConfiguration": "production"
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},
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"serve": {
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"builder": "@angular-devkit/build-angular:dev-server",
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"configurations": {
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"production": {
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"buildTarget": "grid-csp-enabled:build:production"
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},
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"development": {
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"buildTarget": "grid-csp-enabled:build:development"
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}
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},
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"defaultConfiguration": "development"
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},
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"extract-i18n": {
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"builder": "@angular-devkit/build-angular:extract-i18n",
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"options": {
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"buildTarget": "grid-csp-enabled:build"
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}
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},
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"test": {
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"builder": "@angular-devkit/build-angular:karma",
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"options": {
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"polyfills": [
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"zone.js",
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"zone.js/testing"
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],
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"tsConfig": "tsconfig.spec.json",
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"assets": [
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"src/favicon.ico",
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"src/assets"
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],
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"styles": [
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{
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"input": "node_modules/@progress/kendo-theme-default/dist/all.css"
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},
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"src/styles.css"
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],
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"scripts": []
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}
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}
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}
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}
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}
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}

‎examples-standalone/colorpicker-accessibility-fix/package.json‎

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{
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"name": "colorpicker-accessibility-fix",
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"version": "0.0.0",
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"scripts": {
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"ng": "ng",
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"start": "ng serve",
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"build": "ng build",
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"watch": "ng build --watch --configuration development",
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"test": "ng test"
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},
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"private": true,
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"dependencies": {
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"@angular/animations": "^17.0.0",
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"@angular/common": "^17.0.0",
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"@angular/compiler": "^17.0.0",
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"@angular/core": "^17.0.0",
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"@angular/forms": "^17.0.0",
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"@angular/platform-browser": "^17.0.0",
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"@angular/platform-browser-dynamic": "^17.0.0",
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"@angular/router": "^17.0.0",
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"@progress/kendo-angular-inputs": "^15.1.0",
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"@progress/kendo-angular-editor": "^15.1.0",
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"rxjs": "~7.8.0",
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"tslib": "^2.3.0",
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"zone.js": "~0.14.2",
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"@progress/kendo-licensing": "^1.0.2",
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"@progress/kendo-angular-buttons": "15.1.0",
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"@progress/kendo-angular-common": "15.1.0",
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"@progress/kendo-angular-icons": "15.1.0",
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"@progress/kendo-angular-intl": "15.1.0",
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"@progress/kendo-angular-l10n": "15.1.0",
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"@progress/kendo-angular-popup": "15.1.0",
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"@progress/kendo-svg-icons": "^2.0.0",
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"@angular/localize": "^17.0.0",
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"@progress/kendo-theme-default": "^7.2.0"
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},
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"devDependencies": {
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"@angular-devkit/build-angular": "^17.0.10",
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"@angular/cli": "^17.0.10",
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"@angular/compiler-cli": "^17.0.0",
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"@types/jasmine": "~5.1.0",
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"jasmine-core": "~5.1.0",
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"karma": "~6.4.0",
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"karma-chrome-launcher": "~3.2.0",
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"karma-coverage": "~2.2.0",
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"karma-jasmine": "~5.1.0",
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"karma-jasmine-html-reporter": "~2.1.0",
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"typescript": "~5.2.2"
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}
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}

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