media-has-caption

Keywords: media-has-caption, accessibility, ESLint rule, WCAG, a11y, React accessibility

Require captions on media elements. This rule is part of eslint-plugin-react-a11y and provides LLM-optimized error messages with fix suggestions.

Quick Summary

Rule Details

This rule helps ensure WCAG 1.2.2 compliance by enforcing: Require captions on media elements

Why This Matters

Examples

❌ Incorrect

// Violation of media-has-caption
// See rule source for specific examples

✅ Correct

// Compliant with media-has-caption
// See rule source for specific examples

Configuration

// eslint.config.js
{
  rules: {
    'react-a11y/media-has-caption': 'error'
  }
}

WCAG 2.1 Compliance

This rule helps satisfy:

• 1.2.2 Captions: Require captions on media elements

Related Rules

• See RULES.md for all accessibility rules

Further Reading

• WCAG 1.2.2 - WCAG guidelines
• WebAIM - Accessibility resources
• MDN Accessibility - MDN documentation

Version

This rule is available in eslint-plugin-react-a11y v1.0.0+

Known False Negatives

The following patterns are not detected due to static analysis limitations:

Dynamic Variable References

Why: Static analysis cannot trace values stored in variables or passed through function parameters.

// ❌ NOT DETECTED - Prop from variable
const propValue = computedValue;
<Component prop={propValue} /> // Computation not analyzed

Mitigation: Implement runtime validation and review code manually. Consider using TypeScript branded types for validated inputs.

Imported Values

Why: When values come from imports, the rule cannot analyze their origin or construction.

// ❌ NOT DETECTED - Value from import
import { getValue } from './helpers';
processValue(getValue()); // Cross-file not tracked

Mitigation: Ensure imported values follow the same constraints. Use TypeScript for type safety.