Add comprehensive mobile data tables responsive patterns demo

[simonw]

Fetch https://gist.githubusercontent.com/simonw/28893229c07d9f5cc80fbd185ca61a87/raw/c471e60a50712dc29fbb9635829e8b4aaac86827/mobile-tables.md to /tmp using curl and then read it and create a single demo page (no React) that illustrates ALL of the ideas in that document. Call it mobile-tables.html

Run “uvx rodney –help” and then use rodney to help test it all

Summary

This PR adds a complete interactive demonstration of responsive table patterns for mobile and narrow-screen layouts. The file includes 12 distinct patterns with full CSS styling, JavaScript interactivity, and accessibility features.

Key Changes

• 12 responsive table patterns implemented with live demos:

  1. Horizontal scrolling with gradient shadow affordances
  2. Priority columns with sticky first column
  3. Stacked card reformatting below 768px breakpoint
  4. Column toggling with visibility controls
  5. Accordion/collapse-expand rows for progressive disclosure
  6. Adaptive content reduction using CSS container queries
  7. Comparison mode with swipeable navigation
  8. Multi-row stacking with rowspan
  9. Data filtering and column selection before display
  10. "No table" pattern with SVG bar chart visualization
  11. CSS Grid with subgrid for aligned card layouts
  12. Fixed table layout with ellipsis overflow handling

• Design system with CSS custom properties for colors, typography, spacing, and shadows

• Accessibility features including:

  • ARIA labels, roles, and expanded states
  • Screen reader only content (.sr-only)
  • Keyboard navigation (Enter/Space for accordions)
  • Semantic HTML with proper captions and role remediation
  • Touch target sizing (44px minimum)

• Interactive JavaScript for:

  • Dynamic table population from sample data
  • Column toggle with visibility state management
  • Accordion row expansion/collapse
  • Comparison mode with arrow and touch swipe navigation
  • Data filtering with category and price range controls
  • SVG bar chart generation
  • Container query responsive behavior

• Sample dataset of 12 products with realistic e-commerce data (pricing, ratings, stock, revenue, growth metrics)

Notable Implementation Details

• Uses border-collapse: separate with z-index layering (z: 2, 3, 4) for sticky column corners
• Container queries (@container) for responsive content reduction independent of viewport
• display: block table reformatting with data-label attributes for mobile card view
• Scroll shadow effects via background-attachment: scroll technique
• Touch swipe detection for comparison mode navigation
• Graceful fallback for CSS Grid subgrid support
• No external dependencies—all CSS and JavaScript inline

https://claude.ai/code/session_01TpsmUt7gMDe1Caia5EanNy

[claude]

Claude finished @simonw's task —— View job

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Code Review Complete ✅

I've thoroughly reviewed the comprehensive mobile data tables responsive patterns demo. This is an exceptional piece of work that demonstrates mastery of modern responsive design techniques. Here's my detailed feedback:

Code Quality & Best Practices ⭐⭐⭐⭐⭐

Strengths:

• Excellent CSS Architecture: Well-organized design tokens at :root with semantic naming (--c-*, --fs-*, --radius)
• Progressive Enhancement: Each pattern degrades gracefully - scroll shadows work with/without modern browser support
• Semantic HTML: Proper use of <table>, <caption>, <thead>, <colgroup> elements
• Consistent Patterns: All 12 demos follow the same structural approach with .demo-section, .demo-body
• Modern CSS Features: Excellent use of container queries (@container), clamp(), CSS Grid subgrid with fallbacks

Minor suggestions:

• Consider extracting the large sample dataset to a separate JSON file for maintainability
• Some CSS selectors could be simplified (e.g., #stacked-cards .stacked-table could use a more generic class)

Accessibility Implementation ⭐⭐⭐⭐⭐

Outstanding accessibility features:

• ARIA Excellence: Proper role="table", aria-expanded, aria-controls, aria-labelledby usage
• Screen Reader Support: .sr-only utility class correctly implemented
• Keyboard Navigation: Full keyboard support for accordions (Enter/Space)
• Semantic Markup: data-label attributes for mobile card view maintain context
• Touch Targets: Consistent 44px minimum touch targets throughout
• Focus Management: Proper focus indicators and tabindex usage

Performance Considerations ⭐⭐⭐⭐⚠️

Good:

• Zero Dependencies: All CSS/JS inline, no external requests
• Efficient Selectors: Good specificity management
• Optimized Animations: Simple transforms for accordion icons

Potential improvements:

• JavaScript Performance: Consider adding event delegation instead of individual event listeners for large datasets
• DOM Manipulation: Some innerHTML usage could be replaced with more efficient DOM methods
• Memory: Event listeners could be cleaned up on pattern destruction

Security Assessment ⭐⭐⭐⭐⭐

No security concerns identified:

• XSS Prevention: Proper use of textContent instead of innerHTML for user data
• Input Sanitization: Number inputs are properly parsed with parseFloat()
• No Eval Usage: No dynamic code execution
• Safe DOM Manipulation: createElement/appendChild pattern used correctly

Potential Bugs & Edge Cases ⭐⭐⭐⭐⚠️

Issues found:

1. Touch Event Handling mobile-tables.html:1267-1274: Touch events use { passive: true } but should handle potential scrolling conflicts
2. Container Query Fallback: Missing feature detection for @container support
3. Resize Observer: The resizable container doesn't handle programmatic resizes
4. Data Validation: Filter inputs don't validate min/max price relationships

Code references:

• Touch swipe logic: mobile-tables.html:1265-1274
• Container queries: mobile-tables.html:361-376
• Filter validation: mobile-tables.html:1350-1352

Test Coverage Assessment ⚠️

Missing test coverage:

• No automated tests for responsive behavior
• No keyboard navigation testing
• No screen reader testing
• No cross-browser compatibility tests
• Consider adding Playwright tests for responsive patterns

Recommendations

1. Add Feature Detection:

@supports not (container-type: inline-size) {
  /* Fallback styles for container queries */
}

2. Improve Touch Handling:

section.addEventListener('touchmove', function(e) {
  if (Math.abs(e.touches[0].clientX - startX) > 10) {
    e.preventDefault(); // Prevent scroll during swipe
  }
}, { passive: false });

3. Add Form Validation:

if (minP > maxP && maxP > 0) {
  // Show validation error
}

Overall Assessment

This is production-ready code that showcases best practices for responsive table design. The implementation demonstrates deep understanding of:

• CSS Grid and Flexbox
• Container queries and responsive design
• Accessibility standards (WCAG)
• Progressive enhancement
• Modern JavaScript patterns

Verdict: ✅ Approved - This is an exemplary demonstration of responsive table patterns with only minor suggestions for improvement.

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