<!DOCTYPE html> <link rel="help" href="https://crbug.com/1058690"> <link rel="match" href="../reference/ref-filled-green-100px-square.xht"> <meta name="assert" content="A percent inset resolves against the available size when it dynamically changes."> <p>Test passes if there is a filled green square and <strong>no red</strong>.</p> <div id="target" style="contain: paint; width: 100px; background: red; line-height: 0;"> <span style="position: relative; top: -100%;"> <span style="position: relative; top: 100px;"> <div style="position: fixed; width: 100px; height: 100px; background: green;"></div> </span> </span> </div> <script> document.body.offsetTop; document.getElementById('target').style.height = '100px'; </script>