What’s New in Web? 2026 Edition

Christian is a member of the World Wide Web’s architecture board, the Technical Architecture Group (TAG) of W3C. As such, he has insights into what’s going on in the web platform. In his session, you'll gain insights into the latest discussions among standards bodies, browser vendors, and web developers. And you have the opportunity to report your wishes back to the Web’s architecture board. Don't miss this opportunity to stay updated on the forefront of web technologies.

Transcript

1. What’s New in Web? 2026 Edition Christian Liebel @christianliebel Consultant
2. 🇮🇹 🇪🇺 🇩🇪 What’s New in Web? 2026 Edition
3. What’s New in Web? 2026 Edition
4. Technical Architecture Group What’s New in Web? 2026 Edition TAG
5. What’s New in Web? 2026 Edition
6. var let const using What’s New in Web? 2026 Edition Variable Declaration
7. function example() { using resource = new Resource(); return resource.getValue(); } What’s New in Web? 2026 Edition 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
8. What’s New in Web? 2026 Edition Signals https://github.com/tc39/proposal-signals
9. 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? 2026 Edition Signals
10. Method Safe Idempotent Body GET ✅ ✅ ❌ POST ❌ ❌ ✅ PUT ❌ ✅ ✅ DELETE ❌ ✅ ❌ What’s New in Web? 2026 Edition HTTP Methods
11. Method Safe Idempotent Body GET ✅ ✅ ❌ ✅ ✅ ✅ POST ❌ ❌ ✅ PUT ❌ ✅ ✅ DELETE ❌ ✅ ❌ What’s New in Web? 2026 Edition HTTP Methods
12. Method Safe Idempotent Body GET ✅ ✅ ❌ QUERY ✅ ✅ ✅ POST ❌ ❌ ✅ PUT ❌ ✅ ✅ DELETE ❌ ✅ ❌ What’s New in Web? 2026 Edition HTTP Methods
13. What’s New in Web? 2026 Edition QUERY method https://www.ietf.org/archive/id/draft-ietf-httpbis-safe-method-w-body-14.html
14. What’s New in Web? 2026 Edition Digital Credentials API https://developer.chrome.com/blog/digital-credentials-api-origin-trial
15. What’s New in Web? 2026 Edition https://www.w3.org/2001/tag/doc/prevent-credential-abuse/#harms
16. What’s New in Web? 2026 Edition Digital Credentials API https://appfigures.com/resources/insights/20250808?f=2
17. What’s New in Web? 2026 Edition Device Bound Session Credentials https://developer.chrome.com/docs/web-platform/device-bound-session-credentials
18. What’s New in Web? 2026 Edition PEPC https://wicg.github.io/PEPC/permission-elements.html
19. What’s New in Web? 2026 Edition PEPC https://permission.site/pepc
20. TAG Review What’s New in Web? 2026 Edition PEPC https://github.com/w3ctag/design-reviews/issues/1140
21. Second Implementer navigator.serial.getPorts() .then((ports) => { // Initialize the list of available ports with `ports` on page load. }); What’s New in Web? 2026 Edition Web Serial API https://www.theregister.com/2026/04/14/firefox_nightly_web_serial/
22. Firefox supports PWA installation on Windows What’s New in Web? 2026 Edition Web Install
23. beforeinstallprompt navigator.install() <install> What’s New in Web? 2026 Edition Web Install
24. <install src="https://music.youtube.com/"></install> What’s New in Web? 2026 Edition Web Install https://github.com/mikewest/pepc-install/
25. <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? 2026 Edition Interest Invokers https://open-ui.org/components/interest-invokers.explainer/
26. <button fancy>Test</button> <pre src="src.js"></pre> <video start-at="0:05"> </video> What’s New in Web? 2026 Edition Custom Attributes https://github.com/WICG/webcomponents/issues/1029
27. aka Masonry What’s New in Web? 2026 Edition 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; }
28. .sudoku { display: grid; grid-template-columns: repeat(9, 1fr); grid-template-rows: repeat(9, 1fr); gap: 6px; column-rule-width: repeat(2, 1px) 4px repeat(2, 1px) 4px repeat(2, 1px); column-rule-style: solid; column-rule-color: var(--secondary); row-rule-width: repeat(2, 1px) 4px repeat(2, 1px) 4px repeat(2, 1px); row-rule-style: solid; row-rule-color: var(--secondary); } What’s New in Web? 2026 Edition CSS Gap Decorations https://developer.chrome.com/blog/gap-decorations
29. Baseline Newly available October 2025 (single-document) What’s New in Web? 2026 Edition View Transitions https://view-transitions.chrome.dev/ DEMO
30. What’s New in Web? 2026 Edition Element-Scoped View Transitions https://developer.chrome.com/docs/css-ui/view-transitions/element-scoped-view-transitions DEMO
31. – 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? 2026 Edition WebNN https://webnn.io
32. What’s New in Web? 2026 Edition WebNN https://huggingface.co/webnn/spaces
33. – Initiative by Google Chrome – Exploratory APIs for local experiments and use case determination – Downloads AI models into Google Chrome (offline capable) – Models are shared across origins – Uses native APIs directly (full performance) What’s New in Web? Built-in AI https://developer.chrome.com/docs/ai/built-in 2026 Edition
34. Prompt API const languageModel = await LanguageModel.create(); console.log(await languageModel.prompt("Capital of Italy?")); What’s New in Web? 2026 Edition Built-in AI
35. What’s New in Web? 2026 Edition Agentic Browsers
36. What’s New in Web? 2026 Edition WebMCP – Allows websites to expose tools to the browser or external agents – Joint effort by Microsoft and Google https://github.com/webmachinelearning/webmcp
37. What’s New in Web? 2026 Edition WebMCP https://webmcp-maze.bandarra.me/ DEMO
38. What’s New in Web? 2026 Edition WebMCP https://nearform.github.io/web-agents/ DEMO
39. User needs come before the needs of web page authors, which come before the needs of user agent implementors, which come before the needs of specification writers, which come before theoretical purity. What’s New in Web? 2026 Edition Priority of Constituencies https://www.w3.org/TR/design-principles/#priority-of-constituencies
40. What’s New in Web? 2026 Edition Q&A
41. Thank you for your kind attention! Christian Liebel @christianliebel christian.liebel@thinktecture.com Valuta la mia sessione! Scarica le slide