https://bugzilla.wikimedia.org/show_bug.cgi?id=52936

       Web browser: ---
            Bug ID: 52936
           Summary: Move data-parsoid and possibly data-mw out of the DOM,
                    add uids
           Product: Parsoid
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: Unprioritized
         Component: General
          Assignee: gwi...@wikimedia.org
          Reporter: gwi...@wikimedia.org
                CC: ssas...@wikimedia.org
    Classification: Unclassified
   Mobile Platform: ---

We need a general way to associate information with DOM nodes without having
that information inline. The current idea is to set an UID on each DOM node
that has associated information, and use that as the key to externally stored
metadata. This can then be applied to remove private information like
data-parsoid from the DOM we send to the client.

An issue to consider is copy & pasting between pages of the same wiki or even
different wikis.

A simple and safe solution would be to discard all associated private
information for modified (copy & pasted) content. This means that we would have
to leave all semantic information (data-mw primarily) in the DOM even on page
views. It also means that blame map information for example would be lost when
a paragraph is moved around.

An alternative would be to make uids unique in a wiki, or even across wikis.
Example: <wiki id>:<revision id>:<node id>. 1000:40233066:100000 for example
can be encoded as Po:CZehq:Yag. This would allow us to move data-mw out of the
view DOM as well, and would open up interesting ways to preserve associated
metadata like blame maps across copy & pastes. The wiki id would need to be
unique though, and there would need to be a public API to retrieve associated
metadata. When the wiki id is not recognized or data retrieval fails, we might
lose the associated data-mw as well.

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