testing/web-platform/tests/css/css-sizing/div-fit-content-auto-margin.tentative.html


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<!DOCTYPE HTML>
<title> Ensure element is centered by auto margin </title>
<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/3973">
<link rel="match" href="div-auto-margin-ref.html">
<style>
  #outer {
    inset: 0;
    background-color: black;
    margin: auto;
    position: absolute;
    block-size: fit-content;
    inline-size: 100px;
    border: 5px solid red;
  }
</style>
<div id="outer"><div style="block-size: 200px"></div></div>