css/css-flexbox/dynamic-isize-change-001.html

<!DOCTYPE html>
<html>
  <meta charset="utf-8">
  <title>CSS Test: Dynamic change to the inline-size of a container containing a inline-flex child</title>
  <link rel="author" title="Ting-Yu Lin" href="mailto:tlin@mozilla.com">
  <link rel="author" title="Mozilla" href="https://www.mozilla.org/">
  <link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1686961">
  <link rel="match" href="dynamic-isize-change-001-ref.html">

  <style>
  #container {
    border: 1px solid black;
    font: 30px monospace;
    width: 200px;
  }
  .inline-flex {
    display: inline-flex;
    width: 100px;
    border: 1px solid gray;
  }

  .small {
    display: flex;
    align-items: flex-end;
    font: 8px monospace;
    background: pink;
  }
  </style>

  <script>
  function test() {
    let container = document.getElementById("container");
    container.offsetTop;

    /* Change the width to trigger incremental reflow. */
    container.style.width = "400px";
  }
  </script>

  <body onload="test()">
    <div id="container">
      abc
      <div class="inline-flex">
        <div class="small">D</div>
        <div>efg</div>
      </div>
    </div>
  </body>
</html>