The HTML Standard section on Custom Handlers describes the procedure to register custom protocol handlers for URLs with specific schemes. When a URL is followed, the protocol dictates which part of the system handles it by consulting registries. In some cases, handlers may fall to the OS level and and launch a desktop application (eg. mailto:// may launch a native application) or, the browser may redirect the request to a different HTTP(S) URL (eg. mailto:// can go to gmail).
Introduction to Google Chrome Extensions
Build Your Own Browser Tools Without a Backend - J Lopes
Many free online tools want your email first. Most of what they do can happen in the browser instead, and this is how.
The Web Needs a Context Layer Built on a Shared Protocol
Making context a shared protocol, rather than a platform feature, would let readers see competing perspectives anywhere on the web, argue Mallory Knodel, Evan Friedman, and Brad Friedman.
Margin - Write in the margins of the web
Margin - Write in the margins of the web. Comment on any URL with AT Protocol.
Margin - Write in the margins of the web
Margin - Write in the margins of the web. Comment on any URL with AT Protocol.
Margin - Chrome Web Store
Annotate and highlight any webpage, with your notes saved to the decentralized AT Protocol.
Margin - Chrome Web Store
Annotate and highlight any webpage, with your notes saved to the decentralized AT Protocol.
Email explained from first principles
Modern email is a patchwork of protocols and extensions. Here is one article to understand them all.
AT Protocol Primer
What is the AT Protocol and why does it matter in the grand scheme of the web
at://alternatives | AT protocol alternatives for popular products
Discover AT Protocol alternatives for popular products and services. Browse decentralized apps that give you control over your data, identity, and social connections.
jose - npmx
JWA, JWS, JWE, JWT, JWK, JWKS for Node.js, Browser, Cloudflare Workers, Deno, Bun, and other Web-interoperable runtimes
If This Then AT:// - Automation Platform for AT Protocol
Automate your Bluesky presence with powerful visual blueprints. Connect events to actions, schedule posts, and integrate with webhooks.
How Baseline Can Help You Ship Less JavaScript — Smashing Magazine
The gap between “you need a library for this” and “the browser does this” keeps closing. A practical guide to auditing your dependencies and finding what the web platform can now handle for you.
