<style>
body {
margin: 0;
}
#rel-pos {
position: relative;
left: 123px;
top: 456px;
}
#inline-block {
display: inline-block;
position: relative;
left: 12px;
top: 34px;
width: 10px;
height: 20px;
transform: translateZ(0);
}
</style>
<span id="rel-pos"><div id="inline-block"></div></span>