@selectize/selectize/dist/lib/bootstrap3/mixins/tab-focus.less

Selectize is a jQuery-based custom <select> UI control. Useful for tagging, contact lists, country selectors, etc.

// WebKit-style focus

.tab-focus() {
  // WebKit-specific. Other browsers will keep their default outline style.
  // (Initially tried to also force default via `outline: initial`,
  // but that seems to erroneously remove the outline in Firefox altogether.)
  outline: 5px auto -webkit-focus-ring-color;
  outline-offset: -2px;
}