bootstrap-vue/src/components/form/fixtures/form-invalid-feedback.html

BootstrapVue provides one of the most comprehensive implementations of Bootstrap 4 components and grid system for Vue.js and with extensive and automated WAI-ARIA accessibility markup.

<div id="app">
  <!-- default -->
  <b-form-invalid-feedback ref="default" id="default">default</b-form-invalid-feedback>
  <!-- tag -->
  <b-form-invalid-feedback ref="tag" tag="small" id="tag">tag</b-form-invalid-feedback>
  <!-- show -->
  <b-form-invalid-feedback ref="show" force-show id="show">foce show</b-form-invalid-feedback>
</div>