<!DOCTYPE HTML>
<style>
html { writing-mode: vertical-rl; }
</style>
<body>
<p>The following blue box should have uniform padding around all sides.</p>
<div style="float: left; background: olive; padding: 5px;">
<div id="c" style="background: blue; height: 200px; width: 100px">
</div>
</div>
<p style="clear:left">Note that if you zoom the page after it loads
it fixes the problem by causing a reflow.</p>
<script>
var div = document.getElementById("c")
var flush_and_ignore = div.offsetTop;
div.style.height = "100px";
</script>