trilium/apps/web-clipper-manifestv3/docs/FEATURE-PARITY-CHECKLIST.md

Feature Parity Checklist - MV2 to MV3 Migration

Last Updated: October 18, 2025
Current Phase: Screenshot Features

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Status Legend

• ✅ Complete - Fully implemented and tested
• 🚧 In Progress - Currently being worked on
• ⚠️ Partial - Working but missing features
• ❌ Missing - Not yet implemented
• ❓ Unknown - Needs verification

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Core Capture Features

Feature	Status	Notes	Priority
Save Selection	✅	Working with image processing	-
Save Full Page	✅	Readability + DOMPurify + Cheerio	-
Save Link	⚠️	Basic (URL + title only)	LOW
Save Screenshot	⚠️	No cropping applied	HIGH
Save Image	✅	Downloads and embeds	-
Save Tabs (Bulk)	❌	Not implemented	MED

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Content Processing

Feature	Status	Notes	Files
Readability extraction	✅	Working	background/index.ts:608-630
DOMPurify sanitization	✅	Working	background/index.ts:631-653
Cheerio cleanup	✅	Working	background/index.ts:654-666
Image downloading	⚠️	Selection only	background/index.ts:668-740
Screenshot cropping	❌	Rect stored, not applied	background/index.ts:504-560
Date metadata extraction	❌	Not implemented	-
Codeblock formatting preservation	❌	Not implemented	-

Priority Issues:

1. Screenshot Cropping (HIGH)

Problem: Full-page screenshot captured, crop rectangle stored in metadata, but crop NOT applied to image.

MV2 Implementation: apps/web-clipper/background.js:393-427 (cropImage function)

What's Needed:

• Implement cropImage() function in background
• Use OffscreenCanvas API or send to content script
• Apply crop before saving to Trilium
• Test with various screen sizes

Files to Modify:

• src/background/index.ts (add crop function)
• Possibly src/content/screenshot.ts (if canvas needed)

2. Image Processing for Full Page (HIGH)

Problem: postProcessImages() only runs for selection saves, not full page captures.

MV2 Implementation: apps/web-clipper/background.js:293-301 (downloads all images)

What's Needed:

• Call postProcessImages() for all capture types
• Handle CORS errors gracefully
• Test with various image formats
• Consider performance for image-heavy pages

Files to Modify:

• src/background/index.ts:608-630 (processContent function)

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UI Features

Feature	Status	Notes	Priority
Popup interface	✅	With theme support	-
Settings page	✅	Connection config	-
Logs viewer	✅	Filter/search/export	-
Context menus	✅	All save types	-
Keyboard shortcuts	✅	Save (Ctrl+Shift+S), Screenshot (Ctrl+Shift+A)	-
Toast notifications	⚠️	Basic only	LOW
Already visited banner	❌	Backend exists, UI doesn't use	MED
Screenshot selection UI	❓	Needs verification	HIGH

Priority Issues:

3. Screenshot Selection UI Verification (HIGH)

Problem: Unknown if MV3 version has feature parity with MV2 overlay UI.

MV2 Implementation: apps/web-clipper/content.js:66-193

• Drag-to-select with visual overlay
• Escape key to cancel
• Visual feedback during selection
• Crosshair cursor

What's Needed:

• Test MV3 screenshot selection workflow
• Compare UI/UX with MV2 version
• Verify all keyboard shortcuts work
• Check visual styling matches

Files to Check:

• src/content/screenshot.ts
• src/content/index.ts

4. Already Visited Detection (MED)

Problem: Popup doesn't show if page was already clipped.

MV2 Implementation: apps/web-clipper/popup/popup.js (checks on open)

What's Needed:

• Call checkForExistingNote() when popup opens
• Show banner with link to existing note
• Allow user to still save (update or new note)

Files to Modify:

• src/popup/index.ts

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Save Format Options

Format	Status	Notes
HTML	✅	Rich formatting preserved
Markdown	✅	AI/LLM-friendly
Both (parent/child)	✅	HTML parent + MD child

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Trilium Integration

Feature	Status	Notes
HTTP/HTTPS connection	✅	Working
Desktop app mode	✅	Working
Connection testing	✅	Working
Auto-reconnect	✅	Working
Duplicate detection	✅	User choice dialog
Parent note selection	✅	Working
Note attributes	✅	Labels and relations

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Quality of Life Features

Feature	Status	Notes	Priority
Link with custom note	❌	Only URL + title	LOW
Date metadata	❌	publishedDate, modifiedDate	LOW
Interactive toasts	⚠️	No "Open in Trilium" button	LOW
Save tabs feature	❌	Bulk save all tabs	MED
Meta Note Popup option	❌	Not implemented	MED

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Current Development Phase

Phase 1: Core Functionality ✅ COMPLETE

• Build system working
• Content script injection
• Basic save operations
• Settings and logs UI
• Theme system
• Centralized logging

Phase 2: Screenshot Features 🚧 IN PROGRESS

• Task 2.1: Verify screenshot selection UI against MV2
• Task 2.2: Implement screenshot cropping function
• Task 2.3: Test end-to-end screenshot workflow
• Task 2.4: Handle edge cases (very large/small crops)

Current Task: Screenshot selection UI verification

Phase 3: Image Processing (PLANNED)

• Apply image processing to full page captures
• Test with various image formats (PNG, JPG, WebP, SVG)
• Handle CORS edge cases
• Performance testing with image-heavy pages

Phase 4: Quality of Life (PLANNED)

• Implement "save tabs" feature
• Add "already visited" detection to popup
• Add custom note text for links
• Extract date metadata from pages
• Add interactive toast buttons

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Testing Checklist

Before Each Session

• npm run type-check passes
• npm run dev running successfully
• No console errors in service worker
• No console errors in content script

Feature Testing

• Test on regular article pages
• Test on image-heavy pages
• Test on dynamic/SPA pages
• Test on restricted URLs (chrome://)
• Test with slow network
• Test with Trilium server down

Edge Cases

• Very long pages
• Pages with many images
• Pages with embedded media
• Pages with complex layouts
• Mobile-responsive pages

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Known Issues

Critical (Blocking)

1. Screenshot cropping not applied - Full image saved instead of selection
2. Images not embedded in full page - Only works for selection saves

Important (Should fix)

3. Screenshot selection UI untested - Need to verify against MV2
4. No "already visited" indicator - Backend function exists but unused

Nice to Have

5. No custom note text for links - Only saves URL and title
6. No date metadata extraction - Loses temporal context
7. Basic toast notifications - No interactive buttons

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Quick Reference: Where Features Live

Capture Handlers

• Background: src/background/index.ts:390-850
• Content Script: src/content/index.ts:1-200
• Screenshot UI: src/content/screenshot.ts

UI Components

• Popup: src/popup/
• Options: src/options/
• Logs: src/logs/

Shared Systems

• Logging: src/shared/utils.ts
• Theme: src/shared/theme.ts + src/shared/theme.css
• Types: src/shared/types.ts

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Migration Reference

When implementing missing features, compare against MV2:

apps/web-clipper/
├── background.js       # Service worker logic
├── content.js          # Content script logic
└── popup/
    └── popup.js        # Popup UI logic

Remember: Reference for functionality, not implementation. Use modern TypeScript patterns.