I think the editor should automatically translate the less then and more then into HTML escape sequences. I do not use HTML that frequently to remember all the escape sequences.

It appears the problem becames 'visible' when the LT and GT signs are in the same line. The below examples both have the same text but the text in example 2 is all in one line and is interpreted as a HTML.

EXAMPLE 1

sales < 0

and

sales > 0

EXAMPLE 2

sales 0