css/css-flexbox/flexbox-gap-position-absolute.html

<!DOCTYPE html>
<html>
  <meta charset="utf-8">
  <title>CSS Flexible Box Layout Test: Test flexbox intrinsic inline-size, gap, and absolute-positioned children</title>
  <link rel="author" title="Ting-Yu Lin" href="mailto:tlin@mozilla.com">
  <link rel="author" title="Mozilla" href="http://www.mozilla.org/">
  <link rel="help" href="https://drafts.csswg.org/css-flexbox-1/#intrinsic-sizes">
  <link rel="help" href="https://drafts.csswg.org/css-align-3/#gaps">
  <link rel="match" href="flexbox-gap-position-absolute-ref.html">
  <meta name="assert" content="This test verifies the absolute-positioned children do not contribute the gap size to the flexbox's intrinsic inline-size.">

  <style>
  div {
    display: inline-flex;
    gap: 100px;
    background: fuchsia;
  }
  </style>

  <div>
    <span style="position: absolute;"></span>
    <span style="position: fixed;"></span>
    <span>B</span>
    <span>C</span>
  </div>
</html>