Boldface text in WebDirect v19

[Rich S]

This is a silly question, but I can't find an answer: In order to have greater leading (line spacing) between lines of text in WebDirect, one (apparently) has to include the text in a text field instead of text box, then assign the spacing value in the Inspector (Paragraph > Line Spacing.) That works. However, I can't get heading text to appear boldface in a web browser; it appears boldface in the FileMaker Pro file, but not online. I went so far as to create calculation fields that use TextStyleAdd assigned to the heading text, but that doesn't work.

It's probably something so obvious that I'm too dense to see it. : S  TIA for your help.