css/css-ui/outline-offset-inset-003-ref.html

<!DOCTYPE html>
<link rel="help" href="https://drafts.csswg.org/css-ui-4/#outline-offset">
<style>
  div {
    display: inline-block;
    width: 80px;
    height: 80px;
    background: lightblue;
    outline-width: 6px;
    outline-offset: -6px;
    margin: 20px;
  }
  .solid  { outline-style: solid; }
  .dashed { outline-style: dashed; }
  .dotted { outline-style: dotted; }
  .double { outline-style: double; }
</style>
<div class="solid"></div>
<div class="dashed"></div>
<div class="dotted"></div>
<div class="double"></div>