W3C Hackathon TPAC 2025: Kobe Edition

Join fellow TPAC attendees for an evening of quick prototyping, fresh ideas, and nerdy prizes. This is your chance to build, learn, and share, all in the spirit of making Web standards better.

All skill levels welcome!

About

An evening of fun awaits, beyond the formal TPAC schedule.

Date & Time

Date: 11 November, 2025 Time: 19:00–22:30 JST

Location

Venue: Room 501/502, International Conference Center, Kobe

Schedule (JST)

19:00 — Check-in & challenge overview
19:30 — Building starts (90 minutes)
21:00 — Submissions close
21:30 — Lightning demos & voting
22:00 — Prizes & wrap-up

Dinner will be provided throughout the event.

Choose Your Challenge

Pick one track and keep scope tiny. The exact challenges will be revealed closer to the date.

Challenge #1: CSS Playground

Create a wild CSS demo

Put your coding skills to use to build anything that shows off the power (and weirdness) of CSS. Using HTML and JavaScript is fine. AI tools are allowed—just be ready to explain your process.

Challenge #2: Dashboard

Build a small dashboard or visualization

Create something that gathers or presents information in a useful way: could be related to W3C, the Web, or anything you care about. It can be just a concept or a working prototype.

Participation Guidelines

Rules

You have 90 minutes to build or sketch.
Work solo or in a pair.
All work should be created during the hackathon, but reusing your own snippets is fine.
AI tools are allowed—just be ready to explain your process.

Submission Format

Create a GitHub repository for your project.
Include your code + any other materials in the repo.
Post your project in the GH repo Issue thread for the relevant challenge. Include title, hacker(s), description, repo url and a screenshot.

Submission Issues ↗

Submissions

Projects will be showcased here after the event.