February 2020 web platform update

Now available in Chrome
Limited availability

Compression streams: The CompressionStream and DecompressionStream interfaces compress and decompress data using the gzip or deflate formats. Learn more.
Fetch metadata request headers: The Sec-Fetch-Dest, Sec-Fetch-Mode, Sec-Fetch-Site, and Sec-Fetch-User` HTTP headers provide extra information about the way a request was made, to help servers reject certain kinds of malicious requests. Learn more.
JavaScript modules in shared workers: The SharedWorker() constructor accepts { type: "module" } to load scripts that use import and export. Also known as ECMAScript modules or ESM in shared workers. Learn more.
JavaScript modules in workers: The Worker() constructor accepts { type: "module" } to load scripts that use import and export. Also known as ECMAScript modules or ESM in workers. Learn more.
messageerror: The messageerror event fires on a target, such as a window or worker, when an incoming message cannot be deserialized. This event can fire for many types of messages, such as cross-document messages or broadcast channel messages. Learn more.
Offscreen canvas: The OffscreenCanvas API provides a canvas that can be drawn to off screen, with no dependencies on the DOM, which can be used to run heavy rendering operations inside a worker context. Learn more.

Compression streams: The CompressionStream and DecompressionStream interfaces compress and decompress data using the gzip or deflate formats. Learn more.
Fetch metadata request headers: The Sec-Fetch-Dest, Sec-Fetch-Mode, Sec-Fetch-Site, and Sec-Fetch-User` HTTP headers provide extra information about the way a request was made, to help servers reject certain kinds of malicious requests. Learn more.
JavaScript modules in workers: The Worker() constructor accepts { type: "module" } to load scripts that use import and export. Also known as ECMAScript modules or ESM in workers. Learn more.
messageerror: The messageerror event fires on a target, such as a window or worker, when an incoming message cannot be deserialized. This event can fire for many types of messages, such as cross-document messages or broadcast channel messages. Learn more.
Offscreen canvas: The OffscreenCanvas API provides a canvas that can be drawn to off screen, with no dependencies on the DOM, which can be used to run heavy rendering operations inside a worker context. Learn more.

Compression streams: The CompressionStream and DecompressionStream interfaces compress and decompress data using the gzip or deflate formats. Learn more.
Fetch metadata request headers: The Sec-Fetch-Dest, Sec-Fetch-Mode, Sec-Fetch-Site, and Sec-Fetch-User` HTTP headers provide extra information about the way a request was made, to help servers reject certain kinds of malicious requests. Learn more.
JavaScript modules in shared workers: The SharedWorker() constructor accepts { type: "module" } to load scripts that use import and export. Also known as ECMAScript modules or ESM in shared workers. Learn more.
JavaScript modules in workers: The Worker() constructor accepts { type: "module" } to load scripts that use import and export. Also known as ECMAScript modules or ESM in workers. Learn more.
messageerror: The messageerror event fires on a target, such as a window or worker, when an incoming message cannot be deserialized. This event can fire for many types of messages, such as cross-document messages or broadcast channel messages. Learn more.
Offscreen canvas: The OffscreenCanvas API provides a canvas that can be drawn to off screen, with no dependencies on the DOM, which can be used to run heavy rendering operations inside a worker context. Learn more.