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test(core): BottomSheet detents, proven with the interaction harness - #8423

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@vjeux vjeux commented Oct 25, 2026 •

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Review only this PR's change: vjeux/astryx@ec8a345...dc418ea

Stacked on #8549 and #8548. Its base includes the main merges offered for #8548 and #8549, pending their author's decision.

Maintainer impact

The interaction harness (#8045) proves its instruments on fixture pages, but component work needs a real component spec to copy, and BottomSheet's detent motion had no frame evidence. Options: keep proving the harness on fixtures only, or write one component spec that uses each instrument (chosen), on the sheet, whose settle exercises them all.

Intended invariant

No product change. On the "Snap points" story, under real touch input, this spec pins:

  1. A slow release settles on the nearest detent.
  2. A 2,000 px/s downward flick dismisses the sheet.
  3. The settle lands on the detent. Its curve, today the theme's 300 ms --ease-standard transition, is recorded, not asserted: it starts a release at rest at about 1,400 px/s, where spec:AST-094 FR38 starts it at the finger's speed.
  4. The settle keeps advancing while the main thread is blocked, with no Layout or Paint per frame.

Awaiting BottomSheet's owner. component:BottomSheet does not state these four outcomes yet. An engineering owner records them in the BottomSheet contract, or decides that this spec stops pinning them.

Change

  • BottomSheetDetent.interaction.browser.spec.ts: the four outcomes above, plus drag and settle storyboards. Each test names the harness instrument it uses.
  • The busy-main-thread proof reads where the settle ends from the marker chip the screencast frames track, not from the sheet's top; a check pins that the judged window runs until the marker is within 2 px of its rest.
  • packages/core gains the harness as a devDependency; the harness README and config name this spec as the one to copy.

Evidence

  • Before: read from the sheet's top, the judged window ended with the marker 11 px short of its rest (3 of 3 runs), and an upward settle read as a stall that was the reading, not BottomSheet.
  • After: downward and upward settles advance on every frame through a 700 ms block, in Chromium and WebKit.

Scope

  • No intended public API, product behavior, visual direction, or policy change.
  • Product changes discovered during the work were removed or split.
  • Public text and artifacts contain no internal Meta context.

Testing

How to check: build Storybook, then run pnpm test:interaction BottomSheetDetent; each test names what it proves.

What ran on this head: the detent spec and the harness's own spec pass in Chromium (59, 1 skipped) and WebKit (115, 15 skipped), except one harness self-test that fails on its own in WebKit, fixed by #8535. The root build, typecheck and lint pass.

vjeux added 30 commits October 24, 2026 14:37
Adds internal/interaction-harness (@astryxdesign/interaction-harness) and
playwright.interaction.config.ts: phone-sized touch projects in Chromium and
WebKit for *.interaction.browser.spec.ts specs.

Touch scripts are data (tap, drag with hold and rest, flick with an exact
release velocity and velocity profiles, hold-then-drag, pinch, rotate, any
path, a second finger mid-gesture), played as real engine input: CDP
Input.dispatchTouchEvent with scripted timestamps in Chromium, WebKit's own
input command in WebKit. The harness's self-test proves the timestamps, a
native fling and multi-touch delivery; a pr-interaction CI job runs the
proofs against each PR's Storybook build, and a container script runs the
WebKit project where host libraries are missing.
… Chromium

The Chromium driver sent a lift of one finger of several as a touchMove
listing the fingers still down, assuming CDP releases a point a move
omits. It does not: the lifted finger stayed down. A touchEnd that lists
the lifting fingers releases exactly those while the others keep moving,
so the driver sends that, and a self-test lifts one of two fingers and
checks the release, the other finger's moves and the touchend's
remaining touches.

Playwright's WebKit sends that touchend with no remaining touches, which
iOS never does. The harness does not work around it: drivers expose
partialLifts, and PARTIAL_LIFT_SKIP is the reason a proof cites when it
skips; the README lists it with the other engine limits.
… lift profiled flicks at their velocity

- pr-interaction now always reports and the `test` join requires its
  success (AST-030 FR7, FR11), shaped like test-native-swift: a Linux
  interaction-scope job decides, with the base's scope helper and failing
  closed, whether the harness, a component, Storybook, internal/a11y-spec,
  the workflow, package.json or pnpm-lock.yaml changed. Only then do the
  proofs take a 4-core runner; otherwise, and in merge groups (as with
  pr-a11y), the job passes without work.
- A profiled flick's last move runs at velocity times profile(1), so the
  finger lifts at the documented velocity, and releaseVelocity reads the
  last move instead of a 100 ms window mean.
- Docs: drop the /math subpath this package does not export yet; scripted
  timestamps arrive to 0.1 ms; the job comment describes the self-test it
  runs.
…ed its previous position

A sample that repeats a position is not a move: frames that merge() inserts
for another finger, where this finger did not move, made the last move look
shorter, so a 10 Hz drag merged with a tap read 375 px/s instead of 300 and a
60 Hz drag whose other finger lifted 5 ms before its last move read about
3.6x too fast. The previous sample is now the first one at the previous
position, as the page sees it, with a merged case in scripts.test.ts.
Pause every Web Animation, seek it to a time and read the presented
transform and opacity, then compare the curve with oracles that share no
code with the motion under test: cubic-bezier, the SwiftUI spring
(response, dampingFraction, initial velocity), UIScrollView deceleration
and UIKit's rubber band. Storyboards photograph seeked animations at
t = 0, 16.7, 33.3 ... ms or each step of a scripted touch, and write a PNG
contact sheet plus the JSON trace a spec asserts, under the gitignored
test-results/interaction-evidence. A timer gate holds a component's own
timers while a filmstrip is taken. pnpm storyboards runs the tagged tests.
…sented values

An animation that keeps its end value in a run of identical final
keyframes (held so a later interruption can read it) reported its whole
duration as the curve: storyboards filmed the hold, waitForAnimation's
interval reached past the landing, and waitForRest, which also required
every animation to leave the running state and read only transform, timed
out. The curve now ends where that run starts (HeldAnimation.curveEndMs,
waitForAnimation's to, the default storyboard times), and rest is no
animation pending or before its curve's end plus the presented transform,
translate, rotate, scale and opacity (and ::backdrop opacity) still for 3
frames, whatever the playState. sampleCurve composes translate, rotate and
scale with transform, so curves of the individual properties are sampled.
…film no endless curve, let the page cancel gated callbacks

- holdAnimations holds only running document-timeline animations: a
  finished fill animation keeps its end value, an animation the page paused
  stays paused (release resumes only what was held), and a scroll-driven one
  is not seeked. Each held animation keeps its offset from the earliest
  start, so staggered starts stay staggered.
- A sample or storyboard frame at or past an end reports the time it was
  read at (presentedAt, half a millisecond inside the end), and curveOf
  reads oracles there.
- An animation that repeats forever no longer sets a storyboard's default
  length (it ran the worker out of memory); with nothing else to film,
  animationStoryboard asks for times.
- The timer gate queues held callbacks by id, so the page's clearTimeout
  and cancelAnimationFrame still cancel them; a held frame callback gets
  the time it runs; frames(), waitForRest and touchStoryboard use the real
  requestAnimationFrame, so they resolve while frozen.
- The storyboard self-tests carry the @Storyboard tag that
  `pnpm storyboards` selects.
…s from the element's own animations, resume endless ones

- animationStoryboard's default times run from the earliest start to the
  latest curve end among the animations that end, each seek at
  origin + t: beside a spinner that started earlier the animation under
  test no longer shows its start in every frame, and a second animation
  that starts later is filmed to its end.
- A sample's presentedAt (per channel: transform, opacity) comes from the
  sampled element's own animations, by keyframe property, not from any
  animation on the page.
- releaseAnimations({finish: true}) resumes an animation that repeats
  forever instead of finishing it (which throws), and always clears the
  held set.
- The interaction proofs' scope includes packages/themes/*/src/.
…before it looked

waitForAnimation polled getAnimations() after the action, so an entrance
shorter than the first look (a cold page answers its first evaluate late)
had already finished: "no animation started".

The page now records every animation from the first call into curves.ts
on it, and on every later document: a frame loop on its own
requestAnimationFrame, the CSS animation and transition events, and
Element.animate as it is called, pending animations included (WebKit can
start and finish a short script animation between two frames of a fresh
page). waitForAnimation also reports an animation that started after the
last waitForRest or waitForAnimation and has finished, with finishedAt.
watchAnimations(locator) arms the record before an action that may be the
page's first contact with the harness.
…uest

This pull request keeps the curve-sampling instruments: holding and seeking
animations, sampling presented values, the oracles, waiting for an
animation and for rest. The storyboards (storyboard.ts, the evidence
output, the timer gate and the `pnpm storyboards` script) and their tests
move to a pull request stacked on this one.
`holdAnimations` replaced the held set on each call, so a second hold left
the first set paused after `releaseAnimations` (it resumed only the newest
set), and `waitForRest` then reported the frozen frame as rest. A later hold
now adds to the set: everything held stays held until the release, and
offsets count from the earliest start of all of it. The self-test holds two
elements in turn, releases, and checks the first runs to its end; on the
old code it stays frozen 50 px into a 300 px move.

The self-test's header and the `curves.ts` SYNC line no longer describe the
storyboard and timer-gate layer, which moved to its own pull request.
animationStoryboard films held animations by seeking them (t = 0, 16.7,
33.3 … ms, from the earliest start to the latest curve end among the
animations that end, each at its own offset); touchStoryboard takes a
frame per scripted touch event. Each writes a PNG contact sheet and a JSON
trace of its measurements to the evidence directory and attaches them to
the report; the spec asserts on the trace.

The timer gate (installTimerGate, freezeTimers, thawTimers) holds the
page's timers and frame callbacks while a storyboard photographs, so a
component that finishes an animation from a timer cannot do it behind the
held animation's back; the page can still cancel a held callback, and the
harness's own frame waits (and the animation recorder) keep the page's
real requestAnimationFrame. `pnpm storyboards` runs only the tests tagged
@Storyboard.
`touchStoryboard` said velocity-dependent behavior is unchanged in
Chromium. That holds for velocity read from event timestamps, which keep
their scripted times, but a handler that reads `performance.now()` or
`Date.now()` (Item's and Toast's swipes) sees one event per photograph,
about 100 ms apart, so a flick that dismisses when played can settle back
when filmed. The doc and the README now state that limit and point such
gestures at a screencast, and a self-test shows both clocks: scripted
16.7 ms gaps in `timeStamp`, more than two frames in the handler's clock.
Timestamped composited frames (Chromium's screencast and WebKit's own),
a marker the frames can find, and the busy-main-thread proof: block the
page's main thread mid-flight and show the element still moving every
frame, with a requestAnimationFrame animation that freezes as the
negative control. Chromium trace counts of Layout, Paint and style work
inside an animation window, and long tasks. The exemplar spec proves the
BottomSheet drag to a detent with all of it: the drag follows the
finger, a flick dismisses, the settle matches its timing function, keeps
advancing through a blocked main thread in Chromium and WebKit, does no
Layout or Paint, and gets a drag and settle storyboard.
…ed machine

The proof asserted a stall under 40 ms and near-exact frame counts, so a
dropped screencast frame or two on a loaded runner failed it, and frames
delivered out of order read as the element stepping backwards.
busyWindowProof now returns a verdict that tolerates what load does to a
screencast and nothing a frozen animation does: a median frame interval
of at most 20 ms, no stall longer than three screencast intervals, and
at least 90% of the window's whole frame intervals presenting a new
position (one miss always allowed), with the raw numbers in a summary.
Screencast frames are sorted by presentation time, the cadence comes
from the frames around the window, and blockMainThread can block from
inside the page in the frame an animation has run, so a short settle is
still judged at length on a busy machine. The exemplar judges its settle
until it is within 2 px of rest, since the screencast rounds to whole
pixels. A unit test covers the limits; the rAF negative control still
fails every criterion.
…ading them from the animation

The settle-curve oracle took its easing and duration from the animation under
test, so it passed a 900 ms ease-in or a 150 ms linear settle as readily as
the real one. The spec now asserts the theme's values (the default
--ease-standard, cubic-bezier(0.24, 1, 0.4, 1), over the neutral theme's
--duration-medium, 300 ms) and builds the oracle from them; the header no
longer claims 410 ms.
…ebKit frames on its clock

- `blockMainThread`'s `during` path ran its loop inside the rAF callback of
  the frame that saw the animation. WebKit hands a newly started animation
  to its compositor in that frame's rendering update, which runs after rAF
  callbacks, so the loop held the hand-off and even a compositor animation
  froze (2 of 29 frames moved). The loop now runs from a task queued in that
  frame.
- WebKit's screencast frames were rebased onto the wall clock by taking the
  first frame as the start, which shifted every frame earlier by however
  long that frame took to come (60–100 ms). They are now rebased by the
  measured offset between the wall clock and CLOCK_MONOTONIC, which WebKit
  stamps them on.
- `busyWindowProof` fails a judged part shorter than four frames (the
  animation under test was not moving during the block) instead of passing
  it, takes the end value from `settledAt` when given (WebKit can present a
  stale position once an accelerated animation ends while the main thread
  is blocked), and reports where the longest stall starts.
- The BottomSheet busy case arms the block before the release and reads
  where the settle ends from the page.
Retargeting a CSS transition cancels it. If that happened while it was
held, `seekAnimations` and `sampleCurve` set its time again, which revived
it over the page's own new transition, and `releaseAnimations` replayed it
from the start. Seeking, sampling and releasing now drop an `idle` animation
from the held set first, and times count from a fixed origin (the earliest
start held until the release), so dropping one never moves the others. The
self-test retargets a held transition, seeks, releases and waits for rest:
the cancelled transition stays idle and the box ends where the page sent
it. On the old code the cancelled transition is still held after the seek.
# Conflicts:
#	internal/interaction-harness/src/harness.interaction.browser.spec.ts
# Conflicts:
#	internal/interaction-harness/src/harness.interaction.browser.spec.ts
… instrument

`touchStoryboard`'s doc and the README pointed a clock-timed gesture at
`startScreencast` and `castStoryboard`, which this branch does not have. They
now say a storyboard cannot show such a gesture and to record it in real
time.
…cast instruments

With frame evidence in the harness, a clock-timed gesture a storyboard
cannot show is recorded with `startScreencast` and `castStoryboard`: the
doc and the README name them.
`pause()` only schedules the pause: the engine takes the hold time at its
next frame, so a held animation stayed held a frame past `heldAtMs`, and a
read right after the hold varied by a frame between runs. Setting the
current time right after `pause()` completes a pending pause at once, where
`heldAtMs` read it. The self-test holds a 1 s move and checks it is still
at `heldAtMs` two frames later; on the previous code it reads one frame
later in Chromium (16.6–16.7 ms) and 15–70 ms later in WebKit.
# Conflicts:
#	internal/interaction-harness/src/harness.interaction.browser.spec.ts
# Conflicts:
#	internal/interaction-harness/src/harness.interaction.browser.spec.ts
`blockMainThread({during})` counted an animation as running as soon as its
current time reached `minProgressMs`. An animation created in the frame the
page looks is still pending, not on the compositor yet, and at
`minProgressMs: 0` the block started on it and froze it: in WebKit
deterministically, and in Chromium on a Lightbox page while the block still
ran inside the frame's callback. A pending animation no longer counts, and
`minProgressMs` is raised to one frame (16 ms), since in WebKit an
animation's start time resolves before its layer is flushed.

The self-test creates the animation in the frame the helper looks and
blocks at `minProgressMs: 0`. On the previous code it fails 6/6 in WebKit
(0 frames presented through the block); now it passes 10/10 in WebKit and
6/6 in Chromium.
vjeux added 2 commits October 26, 2026 19:00
…here the engine has the Long Tasks API

readLongTasks fails closed since meta#8320's 852d55c: it throws on WebKit, which has no Long Tasks API. The case keeps its drag and settle checks in both engines and asserts no long task in Chromium only, as the harness's own long-task tests gate on the engine.
… while it ran, with readLongTasks failing closed) into the BottomSheet detents

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Approval waits on an engineering owner's decision: BottomSheetDetent.interaction.browser.spec.ts pins outcomes that component:BottomSheet does not state yet, namely the nearest-detent settle after a still release, dismissal on a 2,000 px/s downward flick, and a settle that keeps advancing through a blocked main thread with no Layout or Paint. An engineering owner needs to provide the governing spec by recording which of these the BottomSheet contract states (for the compositor settle, by adopting spec:AST-094 FR5 for the drag settle, in which case the busy proof should also pass maxMedianFrameMs to assert display rate), or decide that the spec stops pinning them, and records that decision by commenting /approve-spec 24e9379dcd26de028f7d11bde296af9323ce1b3a on this pull request; as an engineering owner, the author may do so. Whatever that decision, these changes are needed:

  • The settle assertions (lines 199–202, with the curve checks at 213 and 233) pin a 300 ms cubic-bezier(0.24, 1, 0.4, 1) that leaves a 0 px/s release at 1,411 px/s, which spec:AST-094 FR38 rules out for BottomSheet; report them like the velocity hand-off instead of asserting them, unless FR38 is amended for BottomSheet.
  • Land #8045, #8548 and #8549 first and update the branch, so this pull request contains only its own change rather than 3,711 authored lines.

[Automated review]

vjeux added a commit to vjeux/astryx that referenced this pull request Oct 27, 2026
vjeux added a commit to vjeux/astryx that referenced this pull request Oct 27, 2026
vjeux added a commit to vjeux/astryx that referenced this pull request Oct 27, 2026
vjeux added a commit to vjeux/astryx that referenced this pull request Oct 27, 2026
vjeux added a commit to vjeux/astryx that referenced this pull request Oct 27, 2026
vjeux added a commit to vjeux/astryx that referenced this pull request Oct 27, 2026
… F1's meta#8076 3bfd7c3, X1's meta#8423) into meta#8203

# Conflicts:
#	packages/core/src/BottomSheet/BottomSheet.tsx
#	packages/core/src/BottomSheet/BottomSheetPanel.tsx
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Approval waits on an engineering owner's decision: BottomSheetDetent.interaction.browser.spec.ts pins outcomes that component:BottomSheet does not state yet, namely the nearest-detent settle after a still release, dismissal on a 2,000 px/s downward flick, and a settle that keeps advancing through a blocked main thread with no Layout or Paint. An engineering owner needs to provide the governing spec by recording which of these the BottomSheet contract states (for the compositor settle, by adopting spec:AST-094 FR5 for the drag settle, in which case the busy proof should also pass maxMedianFrameMs to assert display rate), or decide that the spec stops pinning them, and records that decision by commenting /approve-spec 67d67e3de1635641e70b03d826f1d4b9175c851a on this pull request; as an engineering owner, the author may do so. Whatever that decision, one change is needed:

  • The settle assertions (lines 199–202, with the curve checks at 213 and 233) pin a 300 ms cubic-bezier(0.24, 1, 0.4, 1) that leaves a 0 px/s release at 1,411 px/s, which spec:AST-094 FR38 rules out for BottomSheet; report them like the velocity hand-off instead of asserting them, unless FR38 is amended for BottomSheet.

[Automated review]

…erting it

The settle test asserted today's settle, the theme's 300 ms --ease-standard
transition, frame by frame. That curve starts a release at rest at about
1,400 px/s, where spec:AST-094 FR38 starts a BottomSheet's release at the
finger's speed, so the test pinned a curve the spec rules out. It now records
the curve, its easing, its duration and its frame-by-frame fit, in the
evidence and an annotation, as it already did for the velocity hand-off, and
keeps asserting where the settle lands: the half detent.
@vjeux
vjeux marked this pull request as draft October 29, 2026 22:36
vjeux added a commit to vjeux/astryx that referenced this pull request Oct 29, 2026
The two carried harness hunks keep meta#8360's text, as on meta#8105.
vjeux added a commit to vjeux/astryx that referenced this pull request Oct 29, 2026
vjeux added a commit to vjeux/astryx that referenced this pull request Oct 29, 2026
…eta#8548 and meta#8549) into meta#8105

Two carried harness hunks met meta#8360's text, in the harness README and the
header of the harness's own spec: meta#8360's side holds the offer's sentences
plus its animation-recorder paragraph, so both keep meta#8360's text as it is.
vjeux added a commit to vjeux/astryx that referenced this pull request Oct 29, 2026
…into meta#8105

BottomSheetDetent's settle test and header: this branch's, where the settle is
UIKit's release spring, asserted frame by frame from the finger's velocity
(spec:AST-094 FR38), which takes over the test meta#8423 now only records.
vjeux added a commit to vjeux/astryx that referenced this pull request Oct 29, 2026
vjeux added a commit to vjeux/astryx that referenced this pull request Oct 29, 2026
… the offered meta#8548/meta#8549 merges) into meta#8109

motion/README.md: the table takes meta#8360's presentation.ts row, and the
uikit/sheet.ts row keeps this branch's clause, the rubber band past the
tallest detent; Prettier realigns the table.
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Approval waits on an engineering owner's decision: BottomSheetDetent.interaction.browser.spec.ts pins outcomes that component:BottomSheet does not state yet, namely the nearest-detent settle after a still release, dismissal on a 2,000 px/s downward flick, and a settle that keeps advancing through a blocked main thread with no Layout or Paint. An engineering owner needs to provide the governing spec by recording which of these the BottomSheet contract states (for the compositor settle, by adopting spec:AST-094 FR5 for the drag settle, in which case the busy proof should also pass maxMedianFrameMs to assert display rate), or decide that the spec stops pinning them, and records that decision by commenting /approve-spec dc418ea6ba443629b0141ff2bf046a913a4221ec on this pull request; as an engineering owner, the author may do so. The settle curve is now reported rather than asserted, and whatever that decision, these changes are still needed:

  • The settle test's landing check (lines 193–196 and 235) reads the CSS transform transition at 300 ms, so a settle that lands on the half detent but takes 500 ms fails it; assert where the sheet comes to rest, as the slow-drag test does at lines 161–162.
  • The description still lists the 300 ms cubic-bezier(0.24, 1, 0.4, 1) settle as a pinned outcome; update it so the owner decides on what the spec actually pins.

[Automated review]

testInfo,
);
// Where it lands is asserted: the half detent.
expect(samples.at(-1)?.value).toBeCloseTo(halfTop - tallTop, 0);

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This reads the held settle only as a CSS transform transition (lines 193–196 throw otherwise) and only at SETTLE_MS (sampled to 300 ms at line 202). With the panel's transition lengthened to 500 ms the sheet still rests on the half detent (top 357 px), but the value here is translateY(297.87px) against 299.875, so the test fails; a settle played as a script-created Web Animation, as the internal motion animator plays springs on translate, throws at line 195 first. Asserting where the sheet comes to rest, after releaseAnimations, keeps the landing check and leaves the curve as the record the header describes:

await waitForRest(sheet);
expect(await sheetTop(sheet)).toBeCloseTo(halfTop, 0);

vjeux added a commit to vjeux/astryx that referenced this pull request Oct 30, 2026
…#8423's new base) into meta#8386

MobilePowerSearch.test.tsx: the file is main's (its sheet flow now goes back
from Add filter to Filters on a downward swipe), and the swipe test sends a
finger as a touchscreen does, each pointer event with its touch event, on a
sheet given a phone's box, as this branch's earlier swipe test did: with
pointer events alone on jsdom's zero-height sheet it failed here (the flow
stayed on Add filter). Its expectation is main's, unchanged.
vjeux added a commit to vjeux/astryx that referenced this pull request Oct 30, 2026

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