How do you create a hidden div that doesn't create a line break or horizontal space?

Question

I want to have a hidden checkbox that doesn\'t take up any space on the screen.

If I have this:

Answer 1

To hide the element visually, but keep it in the html, you can use:

  [content]

or

  [content]

What may go wrong with display:none? It removes the element completely from the html, so some functionalities may be broken if they need to access something in the hidden element.