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Test Info:

<!DOCTYPE html>
<html class="reftest-wait">
<script>
function init() {
var editor = document.getElementById('editor');
// invalid language will default to en-US
editor.setAttribute('lang', 'testing-XX');
editor.addEventListener("focus", function() {
window.setTimeout(function() {
document.documentElement.className = '';
}, 0);
});
editor.focus();
}
</script>
<body onload="init()">
<textarea id="editor" lang="en-US">good possible word</textarea>
</body>
</html>