<!DOCTYPE html>
<html>
<body>
<p>This tests words won't be corrected immediately when "@" is typed.<br>
To test, "jcomet@". "jcomet" should not be autocorrected to "commet@".</p>
<div contenteditable><br></div>
<script>
document.querySelector('div').focus();
document.execCommand('insertText', false, 'Hello, ');
</script>
</body>
</html>