<!DOCTYPE html>
<style>
ruby::after {
display: block;
content: "";
}
ruby {
display: block ruby;
}
</style>
<script>
if (window.testRunner)
testRunner.dumpAsText();
onload = function() {
var ruby = document.createElement('ruby');
document.body.appendChild(ruby);
document.body.offsetTop;
ruby.appendChild(document.createTextNode('Passed if this test did not crash or assert.'));
}
</script>