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Web Engines Hackfest 2025

URL: https://www.webengineshackfest.org/

Mastodon: @[email protected]

Bluesky: @webengineshackfest.org‬

YouTube: @webhackfest

Dates: 2-4 June 2025

Matrix room: webengineshackfest:matrix.org

IRC channel: #webengineshackfest on OFTC

Wifi: weh2025 / ojSumEthys

Note

REMOTE PARTICIPATION

The Web Engines Hackfest 2025 will be a fully hybrid event. Remote participation will be possible for both talks and breakout sessions.

• Monday 2nd: Talks live stream at https://www.youtube.com/live/De4n7vjEO1o
• Tuesday 3rd & Wednesday 4th: Links to conference calls in each breakout session issue

Scheduling

Time CEST	Monday 2nd
10:00-11:30	Kick-off introduction Talks / Web Apps F2F
11:30-12:00	Coffee break
12:00-13:45	Talks / Web Apps F2F
13:45-15:30	Lunch
15:30-16:30	Talks / Web Apps F2F
16:30-17:00	Coffee break
17:00-18:00	Talks / Web Apps F2F

Time CEST	Tuesday 3rd	Wednesday 4th
10:00-11:30	Breakout Sessions	Breakout Sessions
11:30-12:00	Coffee break	Coffee break
12:00-13:30	Breakout Sessions	Breakout Sessions
13:30-15:00	Lunch	Lunch
15:00-16:30	Breakout Sessions	Breakout Sessions
16:30-18:00	Breakout Sessions	Breakout Sessions

Monday 2nd

Important

Talks live stream at https://www.youtube.com/live/De4n7vjEO1o

Time CEST	Arao Auditorium	HTML Room (rooms 9 + 10)
09:30-10:00	Registration
10:00-10:30	Kick-off introduction
10:30-11:00	Compiling JavaScript ahead-of-time by Oliver Medhurst	W3C Web Apps WG F2F
11:00-11:30	WinterTC: a standard for server-side runtimes by Andreu Botella, Luca Casonato	W3C Web Apps WG F2F
11:30-12:00	Break	Break
12:00-12:30	JSR: under the hood & native support in the ecosystem by Leo Kettmeir	W3C Web Apps WG F2F
12:30-13:00	Bridging CommonJS and ESM in Node.js by Joyee Cheung	W3C Web Apps WG F2F
13:00-13:45	Cross-Engine Contributions at Scale: How newcomers accelerated Temporal and Upsert in SpiderMonkey, V8, and Boa by Jonas Haukenes, Mikhail Barash, Shane Carr	W3C Web Apps WG F2F
13:45-15:30	Lunch	Lunch
15:30-16:00	Versioned Web Components by Christian Ulbrich	W3C Web Apps WG F2F
16:00-16:30	Jumping Over the Garden Wall - WPE WebKit on Android by Adrián Pérez de Castro	W3C Web Apps WG F2F
16:30-17:00	Break	Break
17:00-17:30	Automating Assistive Tech with Standards by Mike Pennisi	W3C Web Apps WG F2F
17:30-18:00	Built-in AI APIs for the Web by Thomas Steiner	W3C Web Apps WG F2F
18:00-20:00	Guided city tour (bus visit to Tower of Hercules area and Mt. San Pedro park)

Tuesday 3rd

Time CEST	HTML Room (rooms 9 + 10)	JS Room (rooms 4 + 5)	CSS Room (rooms 1 + 2)
10:00-11:30	Web Platform: What are we working on?	TC39 proposals and integration with the web platform	Hackathon: Browser integration of Fontations Rust font stack
11:30-12:00	Break	Break	Break
12:00-13:30	Browser Funding After Search Deals	Cross-Origin Storage (COS)	Multimedia in WebKit
13:30-15:00	Lunch	Lunch	Lunch
15:00-16:30	Browser Fingerprinting Protections in Tor+Mullvad Browser	JavaScript subsets for custom embedding use-cases	tvOS as a new platform for Chromium
16:30-18:00	HTML-in-Canvas: Proposal and Progress	Gosub & Yavashark: A New Browser & JS/TS Engine	Chromium Embedding: Experiences and challenges

Wednesday 4th

Time CEST	HTML Room (rooms 9 + 10)	JS Room (rooms 4 + 5)	CSS Room (rooms 1 + 2)
10:00-11:30	Trusted Types	Data-oriented memory savings in JavaScript engines	Adding a new Chrome DevTools feature
11:30-12:00	Break	Break	Break
12:00-13:30	Involving students and researchers in web engine implementation	Privacy Preserving HTML and SVG in Canvas	Servo
13:30-15:00	Lunch	Lunch	Lunch
15:00-16:30	Running WPT under CI: Problems and challenges, tips and tricks, and lessons learned	Signals	Revisiting in-band text tracks in MediaSource Extensions
16:30-18:00	Cross-shadow root references (referenceTarget)	AsyncContext: trimming down the web integration	Designing a New Web Engine — What Would You Do Differently?

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