Comment by stefco_

It's not just a browser thing. Apple Books does this with their e-books, which is infuriating if you're working with a coding book and just want to copy-paste stuff into your editor/terminal. You get something like:

    “ghci> putStrLn (pretty 10 value)”

    Excerpt From: Bryan O’Sullivan, John Goerzen, and Donald Bruce Stewart. “Real World Haskell.” Apple Books. 

When you only copied:

    ghci> putStrLn (pretty 10 value)

Note that the quotes around your actual selection aren't even the ASCII quote character; you get horrid unicode quotes that are easy to miss if you're just trying to run a bit of code in your REPL. This isn't even a DRM ebook, so it's not like Apple is being compelled by contract to insert a citation. It's awful, user-hostile behavior that removes one of the main advantages of digital-vs-hardcopy coding books (copy/paste), and AFAIK there's no config that lets you disable it.