1. Base64 encoding and decoding

    Utility functions for encoding and decoding strings to and from base 64: window.atob() and window.btoa().

  2. Data URIs

    Method of embedding images and other files in webpages as a string of text, generally using base64 encoding.

  3. rtcstatsreport api: `certificate` stats: `base64certificate` in 'certificate' stats