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World Congress 2026 Europe • Jul 9, 2026 • Session details

What’s New in Web? 2026 Edition

Christian Liebel

The 2026 web platform introduces radical shifts for developers. Master native reactive Signals, local browser LLMs, and the new HTTP QUERY method. Prepare your stack for agentic browsing.

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#1 about 3 min

Safeguarding web architecture with the W3C TAG

The Technical Architecture Group reviews new web platform specifications to preserve architectural integrity.

#2 about 2 min

Automatic resource cleanup using variable declarations

The using keyword acts as a destructor for closing connections when instances go out of scope.

#3 about 2 min

Introducing the safe and idempotent HTTP QUERY method

The QUERY request bypasses URL parameter limits without altering server state.

#4 about 2 min

Standardizing reactive state with native JavaScript signals

Adding signals directly to the platform enables frameworks to hook into browser-offered rendering updates.

#5 about 5 min

Evaluating the Digital Credentials API for identity

Accessing digital wallet documents on browsers raises significant privacy and regional blocking concerns.

#6 about 1 min

Cross-engine support for the Web Serial API

Mozilla's intention to support serial hardware interfaces creates paths for unified web standards.

#7 about 2 min

Progressive web app enhancements and manifest localization

Recent standards enable dark color schemes, localized manifest details, and programmatic installation prompts.

#8 about 1 min

Implementing custom attributes for HTML elements

Custom attributes simplify the creation of framework directives inherently on the web platform.

#9 about 2 min

Styling layouts with CSS grid lanes and gaps

Native features streamline complex masonry designs and allow direct styling of flexbox or grid gaps.

#10 about 3 min

Animating complex UI states with view transitions

Element-scoped view transitions coordinate fluid visual shifts between independent components effortlessly.

#11 about 3 min

Accelerating local machine learning models via WebNN

Neural processing units perform hardware-optimized, offline-capable AI computations directly inside the browser.

#12 about 3 min

Utilizing built-in AI models for browser mediation

Interacting directly with on-device language models faces pushback due to cross-engine interoperability differences.

#13 about 5 min

Automating tasks securely through agentic browser protocols

WebMCP empowers websites to expose functional tools for external AI agents to execute automatically.

#14 about 2 min

Prioritizing developer needs during web standard creation

User and developer priorities dictate the prioritization of features entering technical web architecture.

#15 about 2 min

Questions on HTTP QUERY and AI standard timelines

Community members discuss the availability of new HTTP methods and progressive web apps on iOS.

Matching moments

3:35 min

Identifying and exploring upcoming web API concepts

Nikita Dubko · JS Congress

6:00 min

Navigating web element APIs and emerging software vulnerabilities

Chris Heilmann +3 · LIVE

53 sec

The shift toward client-side agentic web development

Jason Mayes · Coffee With Developers

53 sec

Shaping open standards for web-based machine learning

Jason Mayes · Coffee With Developers

1:20 min

Questions on styling extensions and progressive web app potential

Marius Obert Marius Obert · WWC 2023

1:06 min

Tracking upcoming web capabilities and industry resources

Cleyra Uzcategui Cleyra Uzcategui · WWC 2024

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