<!DOCTYPE html>
<style>
div {
    position: fixed
}
</style>
crbug.com/477940: Don't set positioned objects for layout while laying out positioned objects. This test should not ASSERT.
<div>
    <div>
<script>
    if (window.testRunner)
        testRunner.dumpAsText();
    thead = document.createElement("thead");
    document.body.appendChild(thead);
    document.body.offsetTop;
    document.body.removeChild(thead);
</script>
