1. CSS :read-only and :read-write selectors

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

  2. Filesystem & FileWriter API

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

  3. Web NFC

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

  4. ndefreader api: write

  5. writablestreamdefaultwriter api: ready

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

  7. css selector: `:read-write`