+++ This bug was initially created as a clone of Bug #18915 +++
The Rendering section, in subsection Links, Forms and Navigation <http://dev.w3.org/html5/spec/rendering.html#links,-forms,-and-navigation> says:
"User agents are expected to allow users to navigate browsing contexts to the resources indicated by the cite attributes on q, blockquote, ins, and del elements."
As far as I can tell, mainstream UAs do not implement this, and I don't know of any planning to offer such behavior. Making these elements act as hyperlinks directly is likely to be incompatible with existing content, a context menu item is too obscure to be worth it, and out-of-line UI is likely not to merit space in the UI chrome.
"expected" statements in the Rendering section are MUST-level conformance criteria for the "Visual user agents that support the suggested default rendering" conformance class:
Since this requirement is unlikely to be implemented, it should be dropped. Otherwise it is likely to be dropped in CR anyway.
I considered dropping cite="" and datetime="" entirely, and actually did do that edit, but then I noticed that the spec uses cite="" and it seems both useful and harmless, so in the end I left them in. But the UI aspects are demoted to mere "may"s at this point.
Checked in as WHATWG revision r7546.
Check-in comment: You had nearly a decade to make people love you, cite='', but you failed. So you're getting demoted to mere hidden metadata status, the last step before Tantek argues you into obsolescence.