<!DOCTYPE html>
<html>
<head>
<title>This tests that we properly layout positioned descendants.</title>
<script>
if (window.testRunner)
    testRunner.dumpAsText();

window.onload = function() {
  document.execCommand('selectAll');
  document.designMode = 'on';
}
</script>
<style>
html, caption, tfoot, button {
    display: inline-flex;
    position: absolute;
    flex-direction: row-reverse;
}

tfoot {
    position: relative;
}
</style>
</head>
<body>
PASS if no assert in debug.
<table><caption></caption><tfoot><tr><th><button><span></span></button></th></tr></tfoot></table>
</body>
</html>