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chromium/third_party/blink/web_tests/external/wpt/css/css-contain/contain-inline-size-flexitem.html 

<!DOCTYPE html>
<title>contain:inline-size on flexitem</title>
<link rel="author" title="Morten Stenshorne" href="mailto:[email protected]">
<link rel="help" href="https://drafts.csswg.org/css-contain/#contain-property">
<link rel="help" href="https://drafts.csswg.org/css-contain-3/#containment-inline-size">
<link rel="match" href="../reference/ref-filled-green-100px-square.xht">
<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
<div style="width:100px; height:100px; background:red;">
  <div style="display:flex;">
    <div style="contain:inline-size; flex-basis:100px; background:green;">
      <div style="width:300px; height:100px;"></div>
    </div>
  </div>
</div>