The Open Graph protocol
RDFa-style page metadata. I’m considering adding support for it to Komorebi, both in the page headers and the submission form. I can flesh out the discovery code in adjunct to cover this, and there might be no harm in reworking the oEmbed support a bit too.
This seems like a good excuse to write some non-trivial client-side JavaScript for the first time in a long, long time.