size
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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
How to publish
Use a data element with the exact integer number of bytes in the value attribute, and any human-readable representation you choose in the contents. Example:
<data class="p-size" value="45678">45.7 KB</data>
Some examples in the wild only include human-readable string approximations, eg 17.43mb and 62.2 MB, but these can't be used in places that need the exact number of bytes, eg RSS enclosures.
IndieWeb Examples
Services
Granary
granary converts podcast h-feeds and h-entries to RSS with enclosures, including iTunes extension elements.
It reads episode size from the size mf2 properties, and supports both integer bytes and human-readable string approximations. It emits a <data> tag with both integer bytes and human-readable approximation, as described above. Background discussion.