<!DOCTYPE html>
<html>
<head>
<style>
@font-face {
    font-family: Ahem;
    src: url("../../resources/Ahem.ttf");
}

body {
    -webkit-writing-mode: vertical-rl;
    font: 20px/1 Ahem;
}

#test {
    display: inline-block;
    position: absolute;
    left: 0;
    top: 0;
    height: 200px;
}
</style>
</head>
<body>
<div id="test" contenteditable="true"></div>
<script>
if (window.internals)
    internals.setContinuousSpellCheckingEnabled(true);

var test = document.getElementById("test");
test.focus();
document.execCommand("InsertText", false, "mispelled");
document.execCommand("InsertText", false, " "); // Trigger spell checking
test.blur();
</script>
</body>
</html>