Browser Compatibility Bug Fixer

Help me fix browser compatibility issues with my code.

**Code that works in some browsers:**
```{{LANGUAGE}}
{{CODE}}
```

**Browser where it works:** {{WORKING_BROWSER}}
**Browser where it fails:** {{FAILING_BROWSER}}

**Error in failing browser:**
```
{{ERROR}}
```

**Feature being used:** {{FEATURE}}
**Expected behavior:** {{EXPECTED}}
**Actual behavior in failing browser:** {{ACTUAL}}

Please provide:
1. **Compatibility Analysis**: Why it fails in certain browsers
2. **Feature Support**: Check feature support across browsers
3. **Polyfill Options**: Recommend appropriate polyfills
4. **Transpilation**: Babel/PostCSS configuration if needed
5. **Fixed Code**: Cross-browser compatible solution
6. **Progressive Enhancement**: Graceful degradation approach
7. **Feature Detection**: Implement proper feature detection
8. **Testing Strategy**: Cross-browser testing approach