1. CSS revert value

    A CSS keyword value that resets a property's value to the default specified by the browser in its UA stylesheet, as if the webpage had not included any CSS. For example, `display:revert` on a `<div>` would result in `display:block`. This is in contrast to the `initial` value, which is simply defined on a per-property basis, and for `display` would be `inline`.

  2. FileReaderSync

    Allows files to be read synchronously in Web Workers

  3. navigator.hardwareConcurrency

    Returns the number of logical cores of the user's CPU. The value may be reduced to prevent device fingerprinting or because it exceeds the allowed number of simultaneous web workers.

  4. HTTP/2 protocol

    Networking protocol for low-latency transport of content over the web. Originally started out from the SPDY protocol, now standardized as HTTP version 2.

  5. Network Information API

    The Network Information API enables web applications to access information about the network connection in use by the device. Accessed via `navigator.connection`

  6. Offline web applications

    Now deprecated method of defining web page files to be cached using a cache manifest file, allowing them to work offline on subsequent visits to the page.

  7. Passkeys

    Passkeys, also known as Multi-device FIDO Credentials, provide users with an alternative to passwords that is much easier to use and far more secure.

  8. WebRTC Peer-to-peer connections

    Method of allowing two users to communicate directly, browser to browser using the RTCPeerConnection API.

  9. Server Timing

    Mechanism for web developers to annotate network requests with server timing information.

  10. Service Workers

    Method that enables applications to take advantage of persistent background processing, including hooks to enable bootstrapping of web applications while offline.

  11. Shared Web Workers

    Method of allowing multiple scripts to communicate with a single web worker.

  12. SPDY protocol

    Networking protocol for low-latency transport of content over the web. Superseded by HTTP version 2.

  13. Web Authentication API

    The Web Authentication API is an extension of the Credential Management API that enables strong authentication with public key cryptography, enabling password-less authentication and / or secure second-factor authentication without SMS texts.

  14. WebTransport

    Protocol framework to send and receive data from servers using [HTTP3](/http3). Similar to [WebSockets](/websockets) but with support for multiple streams, unidirectional streams, out-of-order delivery, and reliable as well as unreliable transport.

  15. Web Workers

    Method of running scripts in the background, isolated from the web page

  16. WOFF - Web Open Font Format

    Compressed TrueType/OpenType font that contains information about the font's source.

  17. WOFF 2.0 - Web Open Font Format

    TrueType/OpenType font that provides better compression than WOFF 1.0.

  18. webglactiveinfo api: available in workers

  19. webglbuffer api: available in workers

  20. webglcontextevent api: available in workers

  21. webglframebuffer api: available in workers

  22. webglprogram api: available in workers

  23. webglrenderbuffer api: available in workers

  24. webglrenderingcontext api: available in workers

  25. webglshaderprecisionformat api: available in workers

  26. webglshader api: available in workers

  27. webgltexture api: available in workers

  28. webgluniformlocation api: available in workers

  29. websocket api: available in workers