has-error does not change the color of buttons in an input-group · Issue #11659 · twbs/bootstrap · GitHub
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css - How to display red borders on required or invalid value input element in Chrome just like Firefox behaviour for HTML5 validation? - Stack Overflow
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jquery - Bootstrap 4 form validation not working while Using invalid-feedback even when input 'is-valid' - Stack Overflow
has-error does not change the color of buttons in an input-group · Issue #11659 · twbs/bootstrap · GitHub
What are the best ways to display error messages next to an textbox through javascript after clicking on submit button in a form? - Quora
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valid/invalid custom select reverts to default border color on focus · Issue #24553 · twbs/bootstrap · GitHub
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