eww-form-checkbox-selected-symbol

eww-form-checkbox-selected-symbol is a variable defined in `eww.el'.
Its value is

"[X]"

Documentation:
Symbol used to represent a selected checkbox.
See also `eww-form-checkbox-symbol'.

You can customize this variable.

This variable was introduced, or its default value was changed, in version 24.4 of Emacs.