HotDog has advanced HTML and Context Sensitive Help. If you hold your mouse over a tag or attribute, popup help appears giving you a short description of the tag or attribute. For example, if you hold the mouse over the BORDER attribute in the TABLE tag, a popup message appears saying: Sets the size, in pixels, of the table border.
In the example below, MIDDLE is not a valid value for the ALIGN attribute. To avoid creating simple errors like this, you can use Code Completion in conjunction with the HTML Property Sheet.