itextpdf xmlworker PdfPageEventHelper.onGenericTag usage

Question

I am using below dependency for html to pdf

<dependency>
    <groupId>com.itextpdf.tool</groupId>
    <artifactId>xmlworker</artifactId>
    <version>5.5.6</version>
</dependency>

Need to use a custom/generic tags, for that I need to define a chunk and then a generic tag, that is doable using iText but needs to be done through html.

Can anyone please help me out with when onGenericTag method will get called, like onParagraph is called when a p tag is encontered.