Bootstrap CSS (bootstrap.min.css) is successfully referenced and functioning properly. The form-group, btn btn-important, and many other Bootstrap CSS classes are displaying correctly. However, it appears that my validation classes, such as field-validation-error, do not have a corresponding CSS declaration that I can locate.
Where can I find these classes? What am I overlooking? Is there another CSS file that I am missing?
After reviewing the bootstrap documentation at the following link (https://getbootstrap.com/docs/4.3/components/forms/#custom-styles), it appears that there is no specific CSS class defined for field-validation-error. Instead, for validation purposes, the form-control class needs to be added to the <input /> element, which will style it based on the :invalid or :valid CSS4 pseudo selectors.
Another option suggested in the documentation is to use a CSS3 approach (https://getbootstrap.com/docs/4.3/components/forms/#server-side). In this method, the is-invalid or is-valid class can be added to the <input /> element along with the form-control class.
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">
<input class="form-control is-invalid" />
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