Setting show-hint on a required uibTypeAhead will show trigger a constraint message

[Tom-V]

Setting both the requiredand the show-hint attribute on a uibTypeAhead element will trigger the required constraint message on the "hidden" hint input element

Tested with google chrome and the latest version of angular-ui-bootstrap
Plunkr

[wesleycho]

Not sure what we can do about this - to work around this, I recommend using the novalidate attribute, as demonstrated here. In general, it is recommended to disable HTML5 form validation in favor of Angular's.