CSS :read-only and :read-write selectors

:read-only and :read-write pseudo-classes to match elements which are considered user-alterable

Filesystem & FileWriter API

Method of reading and writing files to a sandboxed file system.

Web NFC

This API allows a website to communicate with NFC tags through a device's NFC reader.

gpudevice api: createbindgrouplayout: `read-write` and `read-only` `storagetexture.access`

idbdatabase api: transaction: `mode` parameter supports `readwriteflush`

ndefreader api: write

wgsllanguagefeatures api: `readonly_and_readwrite_storage_textures` extension

writablestreamdefaultwriter api: ready

css property: user-modify: read-write-plaintext-only

css selector: `:read-write`