The page producer converts the HTML template when you call one of its Content methods. When the Content method encounters an HTML-transparent tag, it triggers the OnHTMLTag event. You must write an event handler to determine the type of tag encountered, and to replace it with customized content. See Using page producers from an action item for a simple example of converting HTML-transparent tags. 

If you do not create an OnHTMLTag event handler for the page producer, HTML-transparent tags are replaced with an empty string.