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chromium/third_party/blink/web_tests/external/wpt/css/css-flexbox/baseline-synthesis-004.html 

<!DOCTYPE html>
<link rel="help" href="https://drafts.csswg.org/css-align-3/#synthesize-baseline">
<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="display: flex; align-items: baseline; writing-mode: vertical-lr; background: red;">
  <div style="height: 50px; width: 100px; background: green;"></div>
  <div style="height: 50px; width: 100px; background: green; line-height: 0;">
    <span style="width: 100px; height: 10px; display: inline-block;"></span>
  </div>
</div>