2007815 - [wpt-sync] Sync PR 56932 - docs: Add comprehensive analysis of pointer events issue #56614

Status: NEW

(Testing :: web-platform-tests, task, P4)

Description

[Web Platform Test Sync Bot [:wpt-sync] (Matrix: #interop:mozilla.org)]

Sync web-platform-tests PR 56932 into mozilla-central (this bug is closed when the sync is complete).

PR: https://github.com/web-platform-tests/wpt/pull/56932
Details from upstream follow.

Mishti Agarwal <[e-mail]> wrote:

docs: Add comprehensive analysis of pointer events issue #56614

This PR adds 13 comprehensive documentation files (~40k words) that explain the resolution to GitHub issue #56614: 'Expectations in pointerevent_after_target_removed_from_slot.html'

Documentation Includes:

Quick Start Guides:

• 00_START_HERE.md: Master summary and navigation
• QUICK_COMMANDS.md: Copy-paste terminal commands for PR submission
• QUICK_REFERENCE.md: Q&A, troubleshooting, and quick lookup

Comprehensive Learning:

• POINTER_EVENTS_FIX_SUMMARY.md: Technical overview of the fix
• DETAILED_ANALYSIS.md: In-depth analysis of the problem
• COMPLETE_SOLUTION.md: Full explanation of all aspects
• SOLUTION_COMPLETE.md: Complete solution overview

Contributing & Guidance:

• HOW_TO_CREATE_PR.md: Step-by-step PR creation guide
• PULL_REQUEST_GUIDE.md: Contributing patterns to WPT
• GITHUB_ISSUE_GUIDE.md: How to file and reference issues
• PR_SUBMISSION_GUIDE.md: Complete PR submission workflow
• README_DOCUMENTATION.md: Documentation index and navigation
• INDEX_AND_SUMMARY.md: Quick reference index

What This Explains:

✅ The original issue with pointer events in shadow DOM ✅ Why tests were failing in all browsers
✅ How the fix aligns with W3C specifications
✅ Three test scenarios: remove-slot, remove-filler, change-slotname ✅ Event retargeting and boundary event behavior
✅ Privacy implications of relatedTarget
✅ How to understand and extend these concepts
✅ Step-by-step guides for contributors

Related Issues:

• Fixes #56614
• References commit a9f4351e61 (the actual fix)
• PR #55894 (original PR that fixed the issue)

For Reviewers:

These docs are reference material to help:

• New contributors understand pointer events
• Developers debug similar shadow DOM issues
• Teams understand spec-compliant event dispatch
• Future maintainers understand the fix rationale