Radio
Bootstrap 5 Radio component
A Radio Button is a component used to allow a user to make a single choice among a number of options (whereas Checkboxes are used for selecting multiple options).
Basic example
Browser default checkboxes and radios are replaced with the help of .form-check, a series of classes for both input types that improves the layout and behavior of their HTML elements, that provide greater customization and cross browser consistency. Checkboxes are for selecting one or several options in a list, while radios are for selecting one option from many.
Structurally, our <input>s and <label>s are sibling elements as opposed to an <input> within a <label>. This is slightly more verbose as you must specify id and for attributes to relate the <input> and <label>.
We use the sibling selector (~) for all our <input> states, like :checked or :disabled. When combined with the .form-check-label class, we can easily style the text for each item based on the <input>'s state.
Disabled
Add the disabled attribute and the associated <label>s are automatically styled to match with a lighter color to help indicate the input’s state.
Inline
Group checkboxes or radios on the same horizontal row by adding .form-check-inline to any .form-check.
Without labels
Omit the wrapping .form-check for checkboxes and radios that have no label text. Remember to still provide some form of label for assistive technologies (for instance, using aria-label).