Extracted from 32e626d8f17c98f72f7cdd769a7439802bbb5341.
Validation: cargo fmt --all; cargo clippy --workspace --all-targets
--all-features -- -D warnings. Runtime tests were not run for this split.
Release parser-inserted async modules when their own graphs settle, without waiting for earlier non-async modules. Preserve document order for non-async modules and parser-owned work; cover success, failure and mixed readiness ordering.
Publish realm-owned interface objects only after finalization succeeds and route shared binding helpers through the canonical registry. Keep ECMAScript intrinsics separate and check native realm exposure when deserializing CryptoKey objects.
Validate the main WindowProxy and script environment while the source stays
live, and preallocate the replacement bootstrap state. Move the guarded
entry to Committed before consuming its one-shot detachment token so a
panic cannot return a detached source through live failure handling.
Keep source retirement inside CommittedNavigationEntry, rename the
phase-one retirement entry points, and retire the lifecycle turn once.
Check replacement liveliness before consuming the committed residence.
Cover panics immediately after detachment and during source retirement for
ordinary and open-streaming Pages, including receiver release and renderer
owner reuse after the failed navigation.
Keep the complete source phase-one residence and context resources intact
until navigation commit validation and WindowProxy detachment succeed.
Retire the parser, input bridge and ScriptVm synchronously after that
boundary, and defer source lifecycle termination until commit.
Cover replacement success, 204 No Content, and script-environment and
WindowProxy ownership failures after a replacement response is Prepared.
Verify failed commits preserve the source Inspector context, later body
bytes still parse, and the original Document reaches Load.
Create Streams promise residences with V8 PromiseResolver so writer
ready/closed promises and pending operations do not consult a missing,
throwing or replaced public Promise constructor during bootstrap.
Consume the private resolver on first settlement to preserve
[[AlreadyResolved]] while adopting a still-pending promise. Keep delayed
read rejections on the same settlement path.
Cover allocation before interface bootstrap and writer backpressure and
releaseLock with deleted, undefined or poisoned global Promise bindings.
Start iframe-input with --scrollbars so its nested native control checks
continue to exercise visible scrollbars. Add a default scrollbar-visibility
group covering fetch/serve defaults, boolean environment values and CLI
precedence, geometry, stable gutters, frames, PNG output and input routing.
Cover CDP toggling, navigation, target isolation, detach, resize and layout
dependencies in independent processes with explicit environments.
Validation: 43 harness unit tests passed; scrollbar-visibility (22 scenarios),
iframe-input and classic-scrollbar smoke groups all passed (3/3).
Apply scrollbar hiding to the live Page before acknowledging the command, preserve the startup flag, and replay the target setting before navigation scripts. Validate the required boolean and layout mode, track per-session state, and clear overrides on detach.
Refs #1081
Hide native scrollbars and automatic gutters while preserving scrolling and explicit stable gutters. Require layout mode and retain the setting across navigation, frames, and protocol sessions.
Refs #1081
ldm0