size

  is an emerging microformats2 property that indicates the size in bytes of an audio and/or video file in the same item, eg a podcast.

How to publish
Use a  element with the exact integer number of bytes in the   attribute, and any human-readable representation you choose in the contents. Example:

Some examples in the wild only include human-readable string approximations, eg  and , but these can't be used in places that need the exact number of bytes, eg RSS enclosures.

IndieWeb Examples

 * : details
 * : details

Granary
granary converts podcast h-feeds and h-entries to RSS with enclosures, including iTunes extension elements.

It reads episode size from the  mf2 properties, and supports both integer bytes and human-readable string approximations. It emits a  tag with both integer bytes and human-readable approximation, as described above. Background discussion.