







In this post, we introduce Web-based Code Assurance and Transparency, a project that supports verifiable in-browser code for single-page browser applications. Along with this post, we are publishing the WEBCAT project repository; follow-up posts will provide more detailed information.
Help us test WEBCAT alpha
Web applications are only as trustworthy as the servers that serve them, and servers can get hacked. So, last year, we introduced WEBCAT (Web-Based Code Assurance and Transparency), a project designed to enable verifiable in-browser code for web applications. We wrote extensively about WEBCAT’s requirements, constraints, and goals.Today, we’re excited to announce the alpha release of WEBCAT. In particular, we invite community participation in a new, decentralized enrollment infrastructure.

WEBCAT - Verifiable Code for the Web
WEBCAT helps people trust the websites they use by making it possible to verify the code running in their browser.
Improving the trustworthiness of Javascript on the Web
Today, there's no way to audit a site’s client-side code as it changes, making it hard to trust sites that use cryptography. We preview a specification we coauthored that adds auditability to the web.

Building a Browser-Native Verification Stack for Tinfoil
Learn how we built a browser-based confidentiality and integrity verifier with implementations of browser-native Sigstore and TUF libraries.

Put State in the Right Place - Delaney Gillilan | SSW 2026
On forking the Web
This document contains a set of informal notes on how to build an alternative specification to the Web, in such a way that hopefully prevents many of its drawbacks while still preserves many of the good points. This document is not an specification, and is therefore subject to change over time.
tholian-network/stealth
:rocket: Stealth - Secure, Peer-to-Peer, Private and Automateable Web Browser/Scraper/Proxy
Google’s nightmare “Web Integrity API” wants a DRM gatekeeper for the web
It's just a "proposal," but it's also being prototyped inside Chrome right now.

WebContainer API Docs
Build the future of web based coding experiences, from interactive tutorials to instant production-ready dev environments.

Kicking off our alpha program
In March, we shipped a stable version of Web Applets, a protocol that extends the web to make it possible for agents and websites to communicate, with just a few lines of JavaScript.

Between Principle and Pragmatism: Reflections on Prototyping Computational Media with Webstrates
Computational media describes a vision of software, which, in contrast to application-centric software, is (1) malleable, so users can modify existing functionality, (2) computable, so users can run custom code, (3) distributable, so users can open documents across different devices, and (4) shareable, so users can easily share and collaborate on documents. Over the last ten years, the Webstrates and Codestrates projects aimed at realizing this vision of computational media. Webstrates is a server application that synchronizes the DOM of websites. Codestrates builds on top of Webstrates and adds an authoring environment, which blurs the use and development of applications. Grounded in a chronology of the development of Webstrates and Codestrates, we present eight tensions that we needed to balance during their development. We use these tensions as an analytical lens in three case studies and a game challenge in which participants created games using Codestrates. We discuss the results of the game challenge based on these tensions and present key takeaways for six of them. Finally, we present six lessons learned from our endeavor to realize the vision of computational media, demonstrating the balancing act of weighing the vision against the pragmatics of implementing a working system.

Launch HN: Browser Use (YC W25) – open-source web agents | Hacker News
Check out this video to see it in action: https://preview.screen.studio/share/r1h4DuAk. There are lots more demos at https://github.com/browser-use/browser-use on how we control the web with prompts.
Web Crypto’s SubtleCrypto: A Masterclass in Developer Hostility and How It Strangles the Modern Web
Not Subtle, Just Sabotage — An API Against the Web
Embedding The Web
We need to talk more The web is much more than browsers. What works great in browser development is missing in related spaces like embedding. Can we get together to collectively describe security and compatibility properties of user agents that are not browsers? Can we develop things that don’t ...
Web Engines Hackfest 2025