Using Touchup with Other Elements that Contain Formatting
Having another tag pair inside a Touchup tag pair can override the Touchup processing instructions. For example, if Touchup tags are outside of other tags which contain format specifications, such as a title tag, the inner tag format overrides the surrounding Touchup markup. The title tag instructions, being closest to the text, are the last instructions to take effect. To be effective, the _font tags must be inserted inside the title tag pair to have affect there.
Related information