Fix DOM parity gaps found via real-world MDN test scenarios

[eumaninho54]

Summary

• Tested the sandbox against real HTML/JS snippets adapted from mdn/dom-examples (URL params, localStorage, insertAdjacent, matchMedia, getBoundingClientRect) and found 3 genuine jsdom-parity gaps
• document.location was never set (only window.location existed), so scripts using the common document.location.href pattern threw silently inside sandboxed event handlers
• onchange/oninput/onsubmit/onreset handler properties were never wired to the event system (only onclick/onload/onerror were)
• insertAdjacentElement()/insertAdjacentText() were missing (only insertAdjacentHTML() existed)
• Added the real-world scenarios themselves as permanent regression coverage in RealWorld.harness.ts

Test plan

• tsc --noEmit clean in example/
• clang++ -fsyntax-only clean on all three touched C++ files
• yarn --cwd example test:harness:ios / test:harness:android on a real device/simulator

🤖 Generated with Claude Code

Summary by CodeRabbit

• New Features

  • Added insertAdjacentElement() and insertAdjacentText() for inserting elements and text at standard positions.
  • Added inline event handler support for onchange, oninput, onsubmit, and onreset.
  • Added document.location, including URL reading and navigation assignment support.

• Tests

  • Added coverage for DOM insertion, form events, location behavior, and real-world widget scenarios.

[coderabbitai]

📝 Walkthrough

Walkthrough

Changes

DOM binding extensions

Layer / File(s)	Summary
Adjacent insertion APIs cpp/quickjs/bindings/ElementBindings.cpp, example/src/__harness__/JSDOM.mutation.harness.ts, example/src/__harness__/RealWorld.harness.ts	Adds insertAdjacentElement and insertAdjacentText with four positions, mutation notifications, return values, error handling, and integration coverage.
Inline form and input handlers cpp/quickjs/bindings/EventBindings.cpp, example/src/__harness__/JSDOM.events.harness.ts, example/src/__harness__/RealWorld.harness.ts	Adds onchange, oninput, onsubmit, and onreset mappings and tests event dispatch, persistence, and media-query handler behavior.
Document location exposure cpp/quickjs/bindings/WindowBindings.cpp, example/src/__harness__/JSDOM.navigator.harness.ts, example/src/__harness__/RealWorld.harness.ts	Exposes document.location as the existing location object and supports navigation through assignments.
Browser API integration scenarios example/src/__harness__/RealWorld.harness.ts	Adds scenarios covering URL query rendering and CSS custom-property updates from element geometry.

Estimated code review effort: 3 (Moderate) | ~25 minutes

Sequence Diagram(s)

sequenceDiagram
  participant JavaScript
  participant ElementBindings
  participant DOMTree
  participant MutationObservers
  JavaScript->>ElementBindings: call insertAdjacentElement or insertAdjacentText
  ElementBindings->>DOMTree: insert node at computed position
  ElementBindings->>MutationObservers: notifyChildList with sibling context
  ElementBindings-->>JavaScript: return inserted element or undefined

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Possibly related PRs

• Salve-Software/react-native-nitro-jsdom#23: Extends adjacent insertion behavior in the same element binding module.
• Salve-Software/react-native-nitro-jsdom#37: Uses the same inline event handler property mechanism.
• Salve-Software/react-native-nitro-jsdom#18: Provides the related window location bootstrap used by document.location.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the PR’s DOM parity fixes and MDN-based regression scenarios.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch test/real-world-mdn-snippets

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[github-actions]

🎉 This PR is included in version 2.1.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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