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

body {
    margin: 0;
    padding: 0;
    font: 40px/1 Ahem;
}

#first {
    line-height: 20px;
}
</style>
</head>
<body>
<div id="first" contenteditable="true"></div>
<div id="second" contenteditable="true"></div>
<script>
if (window.internals)
    internals.setContinuousSpellCheckingEnabled(true);

var first = document.getElementById("first");
var second = document.getElementById("second");

for (var element of [first, second]) {
    element.focus();
    document.execCommand("InsertText", false, "mispelled");
    document.execCommand("InsertText", false, " "); // Trigger spell checking
    element.blur();
}
</script>
</body>
</html>