I'm trying to use showdownjs to convert HTML to markdown using converter.makeMarkdown(html). Unfortunately, there isn't much documentation on the library package and it doesn't seem to be converting <br/> <u> or <span style="xxx"></span> tags into valid markdown.

I was wondering if there are configuration options I can set which handle transforming these tags into valid markdown?

Have tried setting a few options with coverter.setOption(xxx,xxx), however these attemps have failed to produce adequate markdown output.