<!DOCTYPE html>
<title>Negative item margins</title>
<link rel="author" title="David Grogan" href="mailto:dgrogan@chromium.org" />
<link rel="help" href="https://drafts.csswg.org/css-flexbox/#resolve-flexible-lengths" />

<p>Test passes if it doesn't crash.</p>

<div style="display: flex; flex-flow: column;">
  <div style="margin: -10px;"></div>
</div>