testing/web-platform/tests/css/css-sizing/div-auto-margin-ref.html


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<!DOCTYPE HTML>
<title> Ensure element is centered by auto margin </title>
<style>
  div {
    inset: 0;
    background-color: black;
    margin: auto;
    position: absolute;
    block-size: 200px;
    inline-size: 100px;
    border: 5px solid red;
  }
</style>
<div></div>