See https://en.wikipedia.org/w/index.php?title=User:99of9/sandbox3&oldid=645853719 for reproducible sample, including instructions for reproducing several related problems.
Steps to reproduce this one:
- Open page containing text and a <ref>. This is reproducible in *Firefox 35* and *Safari 6.2.2* on Mac OS 10.8.5 as well as in the latest Firefox on Windows.
- Select the sentence.
- Press Command-C to copy it.
Result: The selected text disappears.
Attempted workaround:
- Maybe it Cut the text, rather than just deleting it? Try to paste it back in: Command-V.
Result: Nothing happens. The text was not cut.
Quirky detail:
- Open page containing text and a <ref>.
- Select the sentence.
- Right-click to open a menu, and choose Copy from the menu.
Result: It copies (and pastes) the text correctly.