.
<script>
var zK = document.createElement("SPAN");
zK.style.cssText = "position: absolute; top: -50000px; width: 1in; height: 1in";
document.body.appendChild(zK);
console.log(zK.offsetHeight);
document.body.removeChild(zK);
</script>
logs 0 in Servo, but 96 in both Gecko and Chrome.
Google Docs throws an exception ("The number of pixels per point in the user's screen is not set") if the value is falsy ⇒ blocks #13942.