Input-dev Mid Quarter Status

[Timothy Dresser]

Input-dev is a web platform team focused on making touch (P1) and other forms of input (P2) awesome on the web.

See our public page for more information.

This quarter we've seen jdduke@ and miletus@ leave the input-dev team, which has had a significant impact on our performance-related OKRs, but tdresser@ is now leading an effort to increase our investment in this area longer term.

Improve input latency and smoothness

Ensure mean_input_event_latency time remains under 12ms on N5/One for 90% of key_mobile_sites_smooth at least 90% of the time

Punted

Get EventListenerOptions into official DOM event spec

At risk

Implement and ship EventListenerOptions to support registering passive event listeners.

At risk

Ship UX (hung renderer dialog) for unresponsive sites on Android

Punted

VSync-aligned touch input working with unified BeginFrame on Aura

Punted

Reduce smoothness.pathological_mobile_sites.first_gesture_scroll_update on the Nexus 5 by 20%

At risk

Impl side hit-testing against property-tree and display lists.

Punted

Improve understanding of real-world input performance

Expose hardware input timestamps to the web 

On track

Implement experimental input latency web API in M49 

Punted

Expose scroll latency in DevTools somehow

On track

Concrete scroll latency API presented to web-perf WG at TPAC

Punted

All touch latency UMA regressions have appropriate owners within 3 weeks.

On track

Add UMA metrics for determining potential benefit of passive event listeners

On track

Add touch latency metric measuring until estimated vsync time.

Punted

Better measure blink hit-test performance

Punted

Use input-related perf insights data to drive performance investigations, 12 associated Hotlist-Jank bugs

Punted

Eliminate key developer pain points around input

Fix at least 150 Hotlist-Input-Dev bugs

On track

Implement root-layer-replacement mechanism for fullscreen and non-body root scrollers

At risk

Ship more rational mode of top control resizes

On track

Triage any new Blink-Input, Blink-Scroll bug within 7 days

On track

Spec and land API to control Chrome pull-to-refresh nav gesture behind a flag

At risk

Drive adoption of history Scroll Restoration API

On track

Implement unified OSK viewport behavior between Android and CrOS for M49 behind a flag

At risk

[STRETCH] Allow "non-scrolling" apps to interact well with top controls (behind a flag)

Punted

[STRETCH] Implement new input modality media queries 

Punted

[STRETCH] Implement position: device-fixed behind a flag

Punted

Improve interoperability between major browser engines

Enable automated input testing on Chrome for W3C web-platform-tests

At risk

Ship spec-correct body scroll API behavior

Punted

Make all position-related APIs relative to Layout Viewport

On track

Make Chromium reliably send MouseLeave events to blink

At risk

Ship KeyboardEvent.key in M48

At risk

Identify and fix 3 interop bugs with mouse events.

On track

Triage all Hotlist-Interop bugs and find appropriate owners every week

At risk

Fix international keyboard events

Punted

Ship HTMLSelect.open API

Punted

Enable rich scroll effects

Prototype snap-points implementation in M47

At risk

Enable scroll customization on UIWorker thread

At risk

Ship scroll latching for touchpad behind a flag for one platform

Punted

Smooth scrolling for wheel and keyboard scrolls in Win/Linux enabled on trunk

On track

STRETCH: Ship scroll latching for touchpad on all platforms

Punted

Prototype sticky implementation in M48

At risk

Continue PointerEvent API implementation

Fire pointer events for all mouse events

On track

Update MouseEvent (and so PointerEvent) to support fractional co-ordinates

At risk

Extend WebMouseEvent to become a pointer event API

At risk

Implement pointer-id ranges for all pointer types

On track

Force pointercancel firing with mouse off the page.

On track

Add pointer event handler tracking

Punted

Add chorded button transformation to mouse->pointer event generation logic

On track

STRETCH: Explore design choices for explicit pointer capture support

Punted

Evolve touch platform UI

Ship unified touch text selection for native Aura UI

Punted

Make check boxes and radio buttons touch friendly without depending on touch adjustment

On track

Support trackpad pinch-zoom on CrOS

On track

Show touch selection handles when scrolling on CrOS

Punted

Close 10 text selection bugs

On track

Improve UI Events spec and tests

Migrate UIEvent (and old Dom3Event) issues from Bugzilla to github

Reduce spec issue count down to less than 10

Implement basic keyboard and mouse event tests in UIEvent repo

Merge UIEvent tests into main W3C tests

Improve code health

[Stretch] Plan for reducing at least one abstraction layer from input events

Punted