<html>
<head>
<style>
.lr { -webkit-writing-mode: vertical-lr; background-color:green; margin:10px; width:100px; height:100px; }
.float { width:100px; height:100px; background-color:blue; float:left}
body { margin: 0 }
</style>
</head>
<body>
The green LR block should avoid the blue float.
<div class="float"></div>
<div class="lr" id="test"></div>
<div id="console"></div>
<script>
if (window.testRunner)
    window.testRunner.dumpAsText();
test = document.getElementById("test");
rect = test.getBoundingClientRect();
if (rect.left != 100) {
  document.getElementById('console').innerHTML = "FAIL: The floating block should be at an x-offset of 100.";
  test.style.backgroundColor = 'red';
} else
  document.getElementById('console').innerHTML = "PASS: The floating block is in the correct position.";
</script>

</body>