Zepto.js is a minimalist JavaScript library for modern browsers, with a jQuery-compatible API

HTML Standard

Test suites for Web platform specs — including WHATWG, W3C, and others

A behavior for Internet Explorer allowing it to recognize and render various CSS3 box decoration properties

Fetch Standard

DOM Standard

WebCodecs is a flexible web API for encoding and decoding audio and video.

A design and spec for ServiceWorker-based background synchronization

A Private Fields Proposal for ECMAScript

A guide for spec authors on how to use Promises in prose and WebIDL.

Screen Wake Lock API

The API Gap Project is producing a document comparing the APIs and features available across various mobile platforms, and how web APIs and functionality compares.

ECMAScript Object.observe spec

An HTML version of the ECMAScript draft specification autogenerated from the source

Draft for the XML5 proposal.