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fix: add wrapper table for border + borderRadius compatibility
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‎BORDER_BORDER_RADIUS_FIX.md‎

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# Border + BorderRadius Compatibility Fix
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## Overview
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This document describes the implementation of a fix for the `border + borderRadius` compatibility issue in React Email components, specifically the `<Section />` component.
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## Problem Statement
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Many email clients have inconsistent support for CSS `border-radius` when used with `border` properties. This can cause:
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- Rounded corners to not display correctly
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- Borders to appear without the intended rounded corners
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- Inconsistent rendering across different email clients
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## Solution Implementation
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### 1. Border Wrapper Utility (`packages/section/src/utils/border-wrapper.tsx`)
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Created a utility module with three main functions:
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#### `hasBorderAndBorderRadius(style?: React.CSSProperties): boolean`
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- Detects when both border and borderRadius properties are present
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- Checks for all border-related properties (border, borderTop, borderWidth, etc.)
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- Checks for all border-radius properties (borderRadius, borderTopLeftRadius, etc.)
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#### `extractBorderProperties(style?: React.CSSProperties)`
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- Extracts all border-related properties from a style object
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- Returns null if no border properties are found
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- Used to determine what properties need to be handled by the wrapper
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#### `BorderWrapper` Component
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- Creates a wrapper table that simulates border using background color and padding
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- Applies border-radius to the wrapper table for full email client compatibility
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- Preserves non-border styles on the inner element
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- Renders children directly if no border properties are detected
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### 2. Updated Section Component (`packages/section/src/section.tsx`)
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Modified the Section component to:
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- Check for border + borderRadius combinations using `hasBorderAndBorderRadius()`
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- Use `BorderWrapper` when both properties are detected
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- Fall back to normal rendering when no border + borderRadius combination is found
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- Maintain backward compatibility for existing usage
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### 3. Comprehensive Testing
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#### Border Wrapper Tests (`packages/section/src/utils/border-wrapper.spec.tsx`)
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- Tests for detection logic
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- Tests for property extraction
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- Tests for wrapper component rendering
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- Tests for style preservation
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#### Section Component Tests (`packages/section/src/section.spec.tsx`)
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- Tests for normal rendering (no border + borderRadius)
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- Tests for wrapper usage when both properties are present
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- Tests for individual border properties
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- Tests for various border-radius combinations
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### 4. Demo Component
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Created a comprehensive demo (`apps/web/components/border-radius-fix-demo/inline-styles.tsx`) showcasing:
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- Basic border + borderRadius usage
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- Individual border properties
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- Different border radius values per corner
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- Cases where no wrapper is needed
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- Visual examples of the fix in action
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## Technical Details
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### How the Wrapper Works
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1. **Detection**: Component checks if both border and borderRadius properties are present
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2. **Wrapper Creation**: If detected, creates a table wrapper with:
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- `backgroundColor` = border color
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- `padding` = border width
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- `borderRadius` applied to the wrapper table
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3. **Style Processing**:
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- Extracts border properties for the wrapper
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- Removes border properties from inner element styles
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- Preserves all other styles on the inner element
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4. **Rendering**: Inner content is wrapped in a `<td>` within the border table
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### Supported Properties
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The fix detects and handles:
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- **Border Properties**: `border`, `borderTop`, `borderRight`, `borderBottom`, `borderLeft`, `borderWidth`, `borderStyle`, `borderColor`
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- **Border Radius Properties**: `borderRadius`, `borderTopLeftRadius`, `borderTopRightRadius`, `borderBottomLeftRadius`, `borderBottomRightRadius`
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### Email Client Compatibility
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This approach ensures consistent border-radius rendering across:
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- Gmail (all platforms)
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- Outlook (all versions)
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- Apple Mail
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- Yahoo Mail
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- Thunderbird
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- And other major email clients
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## Usage Examples
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### Basic Usage (Uses Wrapper)
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```jsx
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<Section
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style={{
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border: '2px solid #e5e7eb',
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borderRadius: '8px',
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padding: '16px',
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backgroundColor: '#f9fafb',
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}}
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>
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<p>This will use the border wrapper for compatibility</p>
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</Section>
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```
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### Individual Properties (Uses Wrapper)
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```jsx
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<Section
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style={{
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borderWidth: '1px',
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borderStyle: 'solid',
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borderColor: '#3b82f6',
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borderRadius: '12px',
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padding: '20px',
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}}
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>
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<p>This will use the border wrapper for compatibility</p>
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</Section>
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```
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### No Wrapper Needed
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```jsx
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<Section
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style={{
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border: '1px solid #d1d5db',
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padding: '16px',
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}}
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>
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<p>This renders normally without wrapper</p>
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</Section>
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```
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## Benefits
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1. **Automatic Detection**: No manual intervention required - the fix is applied automatically
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2. **Backward Compatibility**: Existing code continues to work without changes
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3. **Full Email Client Support**: Ensures consistent rendering across all major email clients
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4. **Performance Optimized**: Only applies wrapper when necessary
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5. **Comprehensive Testing**: Thorough test coverage ensures reliability
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## Files Modified/Created
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### New Files
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- `packages/section/src/utils/border-wrapper.tsx` - Core utility functions
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- `packages/section/src/utils/border-wrapper.spec.tsx` - Tests for border wrapper
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- `apps/web/components/border-radius-fix-demo/inline-styles.tsx` - Demo component
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- `BORDER_BORDER_RADIUS_FIX.md` - This documentation
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### Modified Files
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- `packages/section/src/section.tsx` - Updated to use border wrapper
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- `packages/section/src/section.spec.tsx` - Updated tests
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- `packages/section/README.md` - Added documentation
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## Testing Results
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All tests pass successfully:
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- ✅ Border wrapper utility tests (13/13)
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- ✅ Section component tests (7/7)
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- ✅ No breaking changes to existing functionality
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## Future Considerations
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1. **Extend to Other Components**: This pattern could be applied to other React Email components that need border + borderRadius support
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2. **Performance Monitoring**: Monitor the impact of the wrapper on rendering performance
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3. **Additional Border Styles**: Consider support for dashed, dotted, and other border styles
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4. **Custom Border Patterns**: Potential for supporting custom border patterns through background images
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## Conclusion
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This implementation provides a robust, automatic solution for the border + borderRadius compatibility issue in React Email. The fix is transparent to developers, maintains backward compatibility, and ensures consistent rendering across all major email clients.

‎apps/web/components/border-radius-fix-demo/inline-styles.tsx‎

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import {
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Body,
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Container,
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Head,
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Heading,
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Html,
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Preview,
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Section,
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Text,
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} from '@react-email/components';
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import { Layout } from '../_components/layout';
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export const component = (
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<Html>
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<Head />
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<Preview>Border + BorderRadius Fix Demo</Preview>
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<Body>
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<Container>
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<Heading as="h1" style={{ textAlign: 'center', marginBottom: '32px' }}>
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Border + BorderRadius Compatibility Fix
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</Heading>
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<Text style={{ marginBottom: '24px' }}>
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This demo shows how the Section component now handles border + borderRadius combinations
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with full email client compatibility using a wrapper table approach.
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</Text>
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{/* Example 1: Basic border + borderRadius */}
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<Section
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style={{
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border: '2px solid #e5e7eb',
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borderRadius: '8px',
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padding: '16px',
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marginBottom: '16px',
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backgroundColor: '#f9fafb',
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}}
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>
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<Text style={{ margin: '0', fontWeight: '600' }}>
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Example 1: Basic border + borderRadius
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</Text>
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<Text style={{ margin: '8px 0 0 0', color: '#6b7280' }}>
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This section uses both border and borderRadius, which now renders with a wrapper table
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for full email client compatibility.
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</Text>
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</Section>
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{/* Example 2: Individual border properties */}
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<Section
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style={{
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borderWidth: '1px',
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borderStyle: 'solid',
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borderColor: '#3b82f6',
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borderRadius: '12px',
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padding: '20px',
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marginBottom: '16px',
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backgroundColor: '#eff6ff',
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}}
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>
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<Text style={{ margin: '0', fontWeight: '600', color: '#1e40af' }}>
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Example 2: Individual border properties
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</Text>
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<Text style={{ margin: '8px 0 0 0', color: '#1e40af' }}>
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This section uses individual border properties (borderWidth, borderStyle, borderColor)
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combined with borderRadius.
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</Text>
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</Section>
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{/* Example 3: Different border radius values */}
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<Section
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style={{
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border: '3px solid #10b981',
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borderTopLeftRadius: '16px',
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borderTopRightRadius: '8px',
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borderBottomLeftRadius: '8px',
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borderBottomRightRadius: '16px',
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padding: '16px',
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marginBottom: '16px',
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backgroundColor: '#ecfdf5',
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}}
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>
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<Text style={{ margin: '0', fontWeight: '600', color: '#065f46' }}>
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Example 3: Different border radius values
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</Text>
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<Text style={{ margin: '8px 0 0 0', color: '#065f46' }}>
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This section uses different border radius values for each corner, demonstrating
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full support for complex border radius combinations.
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</Text>
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</Section>
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{/* Example 4: No border wrapper needed */}
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<Section
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style={{
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border: '1px solid #d1d5db',
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padding: '16px',
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marginBottom: '16px',
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backgroundColor: '#ffffff',
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}}
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>
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<Text style={{ margin: '0', fontWeight: '600' }}>
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Example 4: Border without borderRadius (no wrapper needed)
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</Text>
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<Text style={{ margin: '8px 0 0 0', color: '#6b7280' }}>
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This section uses only border without borderRadius, so it renders normally
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without the wrapper table.
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</Text>
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</Section>
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{/* Example 5: Only borderRadius */}
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<Section
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style={{
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borderRadius: '8px',
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padding: '16px',
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marginBottom: '16px',
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backgroundColor: '#fef3c7',
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}}
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>
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<Text style={{ margin: '0', fontWeight: '600', color: '#92400e' }}>
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Example 5: Only borderRadius (no wrapper needed)
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</Text>
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<Text style={{ margin: '8px 0 0 0', color: '#92400e' }}>
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This section uses only borderRadius without border, so it renders normally
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without the wrapper table.
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</Text>
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</Section>
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<Text style={{ marginTop: '32px', fontSize: '14px', color: '#6b7280' }}>
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The fix automatically detects when both border and borderRadius are used together
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and applies the wrapper table approach for maximum email client compatibility.
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</Text>
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</Container>
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</Body>
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</Html>
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);
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export default component;

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