In HTML, the characters < and > are special (so are quotation marks in certain places). If you want these characters to appear, you'll need to encode them (as < and > respectively). The ampersand is used for encoding, and it follows that the ampersand is also a special character. If you want an actual ampersand to appear, you need to encode that too, as &. Specifically, if you want the string ̅ to appear, you should encode it as &#773;.