Curiously enough, IE is also the only one that allows properly selecting and copying CSS-generated content (i.e. both quotation marks added via "quotes:" as well as general free-form text added via "content:").
Firefox does some semi-functional hack for handling quotation marks, but gives up on "content:", while Chrome and all other Blink-based browsers don't handle that kind of text at all and just skip it entirely. (No idea about Safari, but given its shared rendering engine history with Chrome it presumably doesn't handle it, either.)
Firefox does some semi-functional hack for handling quotation marks, but gives up on "content:", while Chrome and all other Blink-based browsers don't handle that kind of text at all and just skip it entirely. (No idea about Safari, but given its shared rendering engine history with Chrome it presumably doesn't handle it, either.)