What's New in Web – Insights from TPAC 2025

Join Christian, just back from the W3C's annual Technical Plenary and Advisory Committee (TPAC) week in Kōbe, where all W3C working groups such as CSS, WebApps, and Web Machine Learning come together. In his session, you'll gain insights into the latest priorities and discussions among standards bodies, browser vendors, and web developers. Don't miss this opportunity to stay updated on the forefront of web technologies.

Transcript

1. What’s New in Web Insights from TPAC 2025 Christian Liebel @christianliebel Consultant
2. Hello, it’s me. What’s New in Web Christian Liebel W3C WebApps, WebML TAG Associate christian.liebel @thinktecture.com Angular, PWA & Generative AI Microsoft MVP & Google GDE (Angular, Web) Insights from TPAC 2025
3. Technical Plenary and Advisory Committee What’s New in Web Insights from TPAC 2025 TPAC
4. What’s New in Web Insights from TPAC 2025 TPAC Schedule
5. <span popover="hint" id="my-hovercard"> This is the hovercard </span> <a interestfor="my-hovercard" href="..."> Hover to show the hovercard </a> What’s New in Web Insights from TPAC 2025 Interest Invokers https://open-ui.org/components/interest-invokers.explainer/
6. <button fancy>Test</button> <pre src="src.js"></pre> <video start-at="0:05"> </video> What’s New in Web Insights from TPAC 2025 Custom Attributes https://github.com/WICG/webcomponents/issues/1029
7. What’s New in Web Insights from TPAC 2025 Isolated Web Apps JS HTML CSS Enterprise Deploy App Store MSI, APK, … Signed Web Bundle Platform- specific
8. – Launched in ChromeOS in 2024 – Additional trust anchors enable even more powerful APIs – Direct Sockets – Controlled Frame – Multiscreen Capture – Web Smart Cards – Still web-based, cross-platform and using open standards What’s New in Web Insights from TPAC 2025 Isolated Web Apps https://chromeos.dev/en/web/isolated-web-apps
9. What’s New in Web Insights from TPAC 2025 Digital Credentials API https://developer.chrome.com/blog/digital-credentials-api-origin-trial
10. What’s New in Web Insights from TPAC 2025 Digital Credentials API https://www.w3.org/2001/tag/doc/prevent-credential-abuse/#harms
11. What’s New in Web Insights from TPAC 2025 Digital Credentials API https://appfigures.com/resources/insights/20250808?f=2
12. What’s New in Web Insights from TPAC 2025 <amount> element https://github.com/mozilla/explainers/blob/main/amount.md
13. What’s New in Web Insights from TPAC 2025 DOM Localization https://github.com/mozilla/explainers/blob/main/dom-localization.md
14. What’s New in Web Insights from TPAC 2025 Email Verification Protocol https://github.com/WICG/email-verification-protocol
15. aka Masonry What’s New in Web Insights from TPAC 2025 CSS Grid Lanes https://developer.chrome.com/blog/masonry-update .blog { display: grid-lanes; grid-template-columns: repeat(auto-fill, minmax(15rem, 1fr)); gap: 2rem; }
16. What’s New in Web Insights from TPAC 2025 WinterTC https://wintertc.org/
17. – Grants web apps access to the device’s CPU, GPU and Neural Processing Unit (NPU) – In specification by the WebML Working Group at W3C – Implementation in progress in Chromium (behind a flag) – Even better performance compared to WebGPU What’s New in Web Insights from TPAC 2025 WebNN https://webnn.io
18. What’s New in Web Insights from TPAC 2025 WebNN https://huggingface.co/webnn/spaces
19. What’s New in Web Insights from TPAC 2025 Agentic Browsers
20. What’s New in Web Insights from TPAC 2025 WebMCP – Allows websites to expose tools to the browser or external agents – Joint effort by Microsoft and Google https://github.com/webmachinelearning/webmcp
21. What’s New in Web Insights from TPAC 2025 WebMCP https://mcp-ui.mcp-b.ai/
22. What’s New in Web Insights from TPAC 2025 PEPC https://wicg.github.io/PEPC/permission-elements.html
23. What’s New in Web Insights from TPAC 2025 PEPC https://permission.site/pepc
24. Firefox supports PWA installation on Windows What’s New in Web Insights from TPAC 2025 Web Install
25. beforeinstallprompt navigator.install() <install> What’s New in Web Insights from TPAC 2025 Web Install
26. <install src="https://music.youtube.com/"></install> What’s New in Web Insights from TPAC 2025 Web Install https://github.com/mikewest/pepc-install/
27. More from Ecma TC39, IETF, Chrome, … What’s New in Web Insights from TPAC 2025
28. var let const using What’s New in Web Insights from TPAC 2025 Variable Declaration
29. function example() { using resource = new Resource(); return resource.getValue(); } What’s New in Web Insights from TPAC 2025 using class Resource { value = Math.random(); #isDisposed = false; getValue() { if (this.#isDisposed) { throw new Error("Already disposed"); } return this.value; } [Symbol.dispose]() { this.#isDisposed = true; console.log("Resource disposed"); } } https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/using
30. What’s New in Web Insights from TPAC 2025 Signals https://github.com/tc39/proposal-signals
31. const counter = new Signal.State(0); const isEven = new Signal.Computed(() => (counter.get() & 1) == 0); const parity = new Signal.Computed(() => isEven.get() ? "even" : "odd"); // A library or framework defines effects based on other Signal primitives declare function effect(cb: () => void): (() => void); effect(() => element.innerText = parity.get()); // Simulate external updates to counter... setInterval(() => counter.set(counter.get() + 1), 1000); What’s New in Web Insights from TPAC 2025 Signals
32. Method Safe Idempotent Body GET ✅ ✅ ❌ POST ❌ ❌ ✅ PUT ❌ ✅ ✅ DELETE ❌ ✅ ❌ What’s New in Web Insights from TPAC 2025 HTTP Methods
33. Method Safe Idempotent Body GET ✅ ✅ ❌ ✅ ✅ ✅ POST ❌ ❌ ✅ PUT ❌ ✅ ✅ DELETE ❌ ✅ ❌ What’s New in Web Insights from TPAC 2025 HTTP Methods
34. Method Safe Idempotent Body GET ✅ ✅ ❌ QUERY ✅ ✅ ✅ POST ❌ ❌ ✅ PUT ❌ ✅ ✅ DELETE ❌ ✅ ❌ What’s New in Web Insights from TPAC 2025 HTTP Methods
35. What’s New in Web Insights from TPAC 2025 QUERY method https://www.ietf.org/archive/id/draft-ietf-httpbis-safe-method-w-body-14.html
36. Baseline Newly available October 2025 (single-document) What’s New in Web Insights from TPAC 2025 View Transitions https://view-transitions.chrome.dev/
37. What’s New in Web Insights from TPAC 2025 Chrome Split Views
38. Thank you for your kind attention! Christian Liebel @christianliebel christian.liebel@thinktecture.com