I have changed the htmlok config setting to allow HTML code but it doesn't work. My ../conf/local.php file looks like:
$conf['htmlok'] = 1;
Read the syntax page again: “You can embed raw HTML code into your documents by using the HTML tags.”
So to embed HTML you need to enclose the HTML with <html></html> (for inline HTML) or <HTML></HTML> (for block HTML). A little example
<html><strong>This is my bold text</strong></html>