Zachary D. Rowitsch 853235bbe6 Add Phase 3 event dispatch: function expressions, listener registry, and click propagation ...

Implements the event dispatch infrastructure enabling JS scripts to register
event listeners and respond to click events with DOM-spec-compliant bubbling.

Key additions:
- Function expression parsing (anonymous and named) in js_parser
- Function identity via monotonic u64 IDs on JsFunction for removeEventListener
- call_function_with_host on JsVm that isolates handler errors (stays Primed, never Failed)
- EventListenerRegistry with addEventListener/removeEventListener deduplication
- DomEvent model with preventDefault/stopPropagation support
- Event dispatch algorithm: target phase + bubble phase with listener snapshots
- 11 integration tests covering click handlers, bubbling, error recovery, and event properties

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

2026-02-19 15:34:53 -05:00

75 KiB

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