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Enterprise-Grade Modal Refactor: Security, Accessibility & Performance

Summary

This PR refactors the modal implementation to improve security, accessibility, and performance while maintaining full backward compatibility with the existing SocialShareButton API.

Changes

Security

  • Removed all innerHTML usage.
  • Replaced string-based DOM generation with native DOM APIs (createElement, createElementNS, textContent).
  • Added DocumentFragment for secure and efficient DOM construction.
  • Improved compatibility with Trusted Types and strict Content Security Policy (CSP).

Accessibility

  • Added role="dialog", aria-modal="true", and aria-labelledby.
  • Implemented keyboard focus trapping within the modal.
  • Restored focus to the triggering element when the modal closes.
  • Preserved Escape key support for closing the modal.
  • Improved keyboard navigation in line with WCAG 2.1 AA recommendations.

Performance

  • Replaced multiple platform-specific event listeners with a single delegated event listener.
  • Reduced memory usage by eliminating unnecessary listeners.
  • Optimized DOM rendering using DocumentFragment.

Testing

  • Verified the Share modal opens and closes correctly.
  • Verified all sharing platforms continue to function as expected.
  • Tested keyboard navigation, focus trapping, and focus restoration.
  • Confirmed Escape key closes the modal.
  • Verified no visual or API regressions.

Backward Compatibility

  • No breaking API changes.
  • Existing styling and functionality remain unchanged.
  • Fully backward compatible with previous implementations.

This refactor improves the library's security, accessibility, maintainability, and runtime efficiency while preserving its existing behavior.