Post #1307944

@chrysn Interesting: `rel=alternate` isn't body-ok on its own (https://html.spec.whatwg.org/multipage/links.html#body-ok), but it can be an `itemprop` for an object declared on an ``. [Edit: er, oops, s must have exactly one of `rel` or `itemprop`.] I can imagine that some RDF property would express this, although because RDF edges aren't ordered, there would have to be an independent definition of what order to try the fallbacks. I suspect it'll wind up too verbose to be useful, but it makes sense to describe it as an alternative to consider. Want to send a PR to https://github.com/jyasskin/handling-unreliable-links?