<!DOCTYPE html>
<html>
<head>
<title></title>
<style>
canvas {
    width: 100%;
    position: fixed;
    -webkit-flow-into: foobar;
    -webkit-writing-mode: vertical-lr;
}
</style>
</head>
<body>
<canvas></canvas>
PASS if no assert in debug.
<script>
if (window.testRunner)
  testRunner.dumpAsText();
</script>
</body>
</html>