<style>
p { margin: 5px 1em; width: 0; }
* { padding-top: 1073741824rem; }
:first-of-type { position: fixed; }
</style>
<p id="a">a</p>
<p id="b">b</p>
<p id="c">-_</p>
Test passes if it doesn't hit an assertion or crash.
<script>
if (window.testRunner)
    testRunner.dumpAsText();
document.body.parentNode.appendChild(document.getElementById("a"));
document.body.parentNode.appendChild(document.getElementById("b"));
document.body.parentNode.appendChild(document.getElementById("c"));
</script>