When i am on a confluence page (edit mode) i can do a long-tap to get the context menu. Then i am able to select "copy" or "cut". Another long-tap within the edit-iframe brings me the context menu again, and again with "copy" and "cut" but a "paste" is missing.

Checked it with different browsers (see subject). On input and textarea fields i get the "paste" option. A little bug in your iframe&javascript solution.

Confluence 5.1.3
Kindle Fire HD (2nd edition / Oct. 2013 version; no cam, no mic)