Bootstrap includes validation styles for error, warning, and success states on form controls. To use, add .has-warning, .has-error, or .has-success to the parent element. Any .control-label, .form-control, and .help-block within that element will receive the validation styles.

You can also add optional feedback icons with the addition of .has-feedback and the right icon.
Feedback icons only work with textual <input class="form-control"> elements.

Note that many native select menus—namely in Safari and Chrome—have rounded corners that cannot be modified via border-radius properties.

Checkboxes are for selecting one or several options in a list, while radios are for selecting one option from many.
Disabled checkboxes and radios are supported, but to provide a "not-allowed" cursor on hover of the parent <label>, you'll need to add the .disabled class to the parent .radio, .radio-inline, .checkbox, or .checkbox-inline.