WebML WG/CG F2F Agenda - TPAC 2025 (Kobe, Japan)

[anssiko]

Working Group / Community Group F2F

10-11 November 2025 - 00:00-07:45 UTC / 09:00-16:45 JST

Logistics

• ✅ Registration: open until 3 November 2025
  • See also: registration fee waivers
• 🏨 Venue: Kobe International Conference Center (map) in-person & remote
  • Monday: 09:00–16:45 JST, Floor 4 - 403
  • Tuesday: 09:45–17:30 JST, Floor 4 - 405
  • All WebML WG/CG participants and invited guests welcome!
• 📞 Remote joining instructions: see Invite > Joining Instructions (1 wk prior)
• ✍️ IRC web client: #webmachinelearning
• 🗓️ Invites: invite 10 November 2025, invite 11 November 2025
• ✍️ Minutes: minutes 10 November 2025, minutes 11 November 2025

Agenda

This is a Living Agenda. Feedback and suggestions for F2F topics welcome via comments for both TBA topics (To Be Announced) and timing to avoid scheduling conflicts. F2F issues are triaged as Agenda+.

10 November 2025: 🧠 Web Neural Network API

Important

Meeting schedule in Japan Standard Time (JST). Remote participants, please note the meeting may start on 9 November in your timezone.

See the timezone table ...

San Francisco	Sun, 9 November 2025	16:00
Boston	Sun, 9 November 2025	19:00
London	Mon, 10 November 2025	00:00
Berlin	Mon, 10 November 2025	01:00
Helsinki	Mon, 10 November 2025	02:00
Shanghai	Mon, 10 November 2025	08:00
Kobe	Mon, 10 November 2025	09:00
UTC	Mon, 10 November 2025	00:00 UTC

See also: other locations

▶️ 09:00 (JST) Start

👋 Welcome

• Intros
• Agenda bashing

📘 Charter orientation

Tip

Working Group home | charter
Community Group home | charter
Web Machine Learning umbrella site | GH org

• WG and CG interplay
• Current scopes, future aspirations
• New deliverables
• Coordination with other groups

⏳ Spec orientation

Tip

WebNN API spec | explainer | open issues

• Triage pass through open issues (triage guidance):
  • breaking changes
  • priorities
  • next steps for the key issues
  • ...

💡 Case study

• WebNN Small Language Model (SLM) Performance Optimization Case Study (slides) @huningxin

⏸️ 10:30 (JST) Break

Drinks and snacks at Reception Hall, 3F, 4F, 5F.

▶️ 11:00 (JST) Resume

✨ New features

• Core operator set webnn#573:
  • extend with attentions, MoE, TopK, MatMulNBits ... or fuse
  • performance vs. code complexity assessment results
• Support flexible input sizes webnn#883: dynamic shape types
• Proposal: API to Separate Graph Building from Weight Loading to Reduce Peak Memory Usage webnn#901 @mtavenrath
• 🏷️ Device selection: seek consensus on scope
  • Device selection criteria for usecase-driven scenarios webnn#902
  • before graph compilation hints
    • general discussion Query supported devices before graph compilation webnn#815
    • CPU fallback hint webnn#900
  • Get devices used for a graph after graph compilation webnn#836
  • MLOpSupportLimits should be opt-in with base functionality webnn#759

ℹ️ Proposed in issue triage

To be discussed schedule allowing:

• Integration with real-time video processing webnn#226
• Request standards positions from Mozilla and WebKit webnn#763
• Caching mechanism for MLGraph webnn#807
• Custom operations webnn#6

⏸️ 12:30 (JST) Lunch

Lunch at Portopia Hotel, South wing, Ohwada 2/3, 1F (map)

▶️ 13:30 (JST) Resume

📢 Customer feedback & collaborations

Tip

See WebNN Awasome for community feedback, demos, presentations, samples, testimonials, tutorials, videos, and more. And APIs as ladders essay as food for thought.

TBA Discuss customer feedback, including end-users, frameworks, independent software vendors.

Proposed topics:

• RTC-style workloads with response time requirements Support for workloads with response time requirements (realtime) webnn#898 @handellm / Google Meet

🤝 Interop and technical cross-group coordination

Tip

WebNN implementation report | wpt test suite | webnn report

• Web Platform Tests coverage, open issues.
• TBA Interop issues arising from backend implementation differences that warrant WebNN spec changes.
• TBA Technical coordination topics with WebGPU, WebAssembly, WebRTC, other groups.

🚀 Implementation plans and trials

Tip

WebNN implementation status by:

• Operations
• Framework integrations
• Backends: Lite RT, Windows ML, Core ML
• Hardware accelerators

See also:

• High-level arch diagram

Next step for implementations, Origin Trial or equivalent, new requirements or feedback from updates in backends, frameworks.

Kick off this session with demos that exercise diverse hardware accelerators:

• WebNN via ONNX Runtime Web:
  • Segment Anything (GPU / NPU)
  • Whisper Base (GPU / NPU)
  • Stable Diffusion Turbo (GPU / NPU)
• WebNN via Transformers.js:
  • Depth Anything (GPU / NPU)
  • MODNet (GPU / NPU)
  • YOLO12n (GPU / NPU)

Possible discussion topics:

• TBA Browser vendors' trials
• Backends: Windows ML, LiteRT, MLDrift, Core ML
• Frameworks: ONNX Runtime Web, Transformers.js, LiteRT.js

⏸️ 15:00 (JST) Break

Drinks and snacks at Reception Hall, 3F, 4F, 5F.

▶️ 15:30 (JST) Resume

Horizontals

Get to know experts behind horizontal groups.

😇 Ethics

• Ethical Principles for Web Machine Learning as a joint deliverable with the Web & AI Interest Group @dontcallmedom

🌱 Sustainability

• Sustainable Web Interest Group collaboration @TzviyaSiegman @mgifford
• Web Sustainability Guidelines @AlexDawsonUK @mgifford
• Related: Evaluate sustainability impact webnn#861

🔍 Privacy & Security

• Threat Modeling with Privacy and Security (slides) @tjwhalen @simoneonofri

• See also:

  • 11 Nov 2025 08:30–09:30 JST Security guidance for web developers breakout
  • 14 Nov 2025 14:00–16:00 JST Security IG F2F (agenda)

🫶 Wrap up

• Synthesis of key outcomes, next steps

⏹️ 16:45 (JST) End

• 🍱 Group dinner (see 1 and 2)

11 November 2025: 🧪 Incubations: WebMCP, Built-in AI APIs

Meeting schedule in Japan Standard Time (JST). Remote participants, please note the meeting may start on 10 November in your timezone.

See the timezone table ...

San Francisco	Mon, 10 November 2025	16:00
Boston	Mon, 10 November 2025	19:00
London	Tue, 11 November 2025	00:00
Berlin	Tue, 11 November 2025	01:00
Helsinki	Tue, 11 November 2025	02:00
Shanghai	Tue, 11 November 2025	08:00
Kobe	Tue, 11 November 2025	09:00
UTC	Tue, 11 November 2025	00:00 UTC

See also: other locations

▶️ 09:45 (JST) Start

👋 Welcome

• Intros
• Agenda bashing

🤖 WebMCP

Tip

WebMCP main explainer | API proposal | Service Workers explainer | early implementation experience

• WebMCP intro & demo and another demo

• Built-in agent ideation @huningxin
• Communication with the TAG webmcp#35
• Privacy & security considerations for WebMCP  webmcp#45

⏸️ 11:00 (JST) Break

Drinks and snacks at Reception Hall, 3F, 4F, 5F.

▶️ 11:30 (JST) Resume

🤖 WebMCP

• Managing action specific permissions webmcp#44

• WebMCP accessibility, ARIA mapping via Declarative API: #26 @matatk

• Define the API for in-page Agents to use a site's declared tools webmcp#51

• Should we support cross-origin Agents across frame boundaries webmcp#52

• See also: other Agenda+ issues

Other proposed topics

• To be discussed in context of #45 Working with the Security Interest Group: threat modeling Agentic AI Web Browser @simoneonofri, lethal trifecta @johannhof
• Working with the AI Agent Protocol Community Group
• Working with the MCP Community

⏸️ 13:00 (JST) Lunch

Lunch at Portopia Hotel, South wing, Ohwada 2/3, 1F (map)

▶️ 14:00 (JST) Resume

💬 Built-in AI APIs overview

Overview, Origin Trial feedback @michaelwasserman

💬 Prompt API

Tip

Prompt API spec | explainer

• Prompt API w3ctag/design-reviews#1093
• Add image input resizing or tiling options prompt-api#133
• Tool Use: decouple execution and formalize function calls and responses prompt-api#159

✍️ Writing Assistance APIs

Tip

Writing Assistance APIs spec | explainer

• User Activation requirements for Session Creation cause undue friction writing-assistance-apis#83
• Discuss the privacy implications of using a paid cloud option writing-assistance-apis#84

⏸️ 16:00 (JST) Break

Drinks and snacks at Reception Hall, 3F, 4F, 5F.

▶️ 16:30 (JST) Resume

🌍 Translator and Language Detector APIs

Tip

Translator and Language Detector APIs spec | explainer

• TBA 2-3 key open issues

🔎 Proofreader API

Tip

Proofreader API explainer

• TBA 2-3 key open issues

🌱 Proposals for new incubations

• Review and discuss any new proposals:
  • MCP-UI

🫶 Wrap up

• Synthesis of key outcomes, next steps

⏹️ 17:30 (JST) End

• 🍣 Group dinner (see 1 and 2)

[anssiko]

Quoting what is said above to drive the point home:

This is a Living Agenda. Feedback welcome via comments for both TBA topics (To Be Announced) and timing to avoid scheduling conflicts.

[anssiko]

@simoneonofri to identify and propose the right experts to participate in the security discussions from the Security Interest Group and Threat Modeling Community Group.

[anssiko]

I've added Device selection as a F2F topic we want to build consensus on. This falls under the "new features" session. Thank you @mtavenrath and the NVIDIA team for offering to help with this feature.

Further agenda topic proposals welcome via comments in this issue, or via direct email to me.

[anssiko]

@michael-n-cooper, the WebML CG would welcome a11y experts interested in agentic web features to join us at TPAC F2F #35 to discuss how the agentic web feature WebMCP could help improve accessibility. We've now exploring a complementary Declarative API #26 for it and are looking into ARIA mappings. This a11y discussion is currently slated for 11 November 2025 11:00 JST.

[anssiko]

We have added a slew of compelling WebNN demos to the "Implementation plans and trials" session on Monday. From this demo session, we'll transition to discuss browser vendors' trial plans, dissect the latest implementation experience across the layers to inform the WebNN spec development.

[anssiko]

For WebMCP privacy & security considerations discussion, please familiarize yourself with webmachinelearning/webmcp#45 Credits to @victorhuangwq for this pre-work.

[anssiko]

Added to the WebNN customer feedback & collaborations session:

RTC-style workloads with response time requirements webmachinelearning/webnn#898 via @handellm / Google Meet