What I can't see how to do is, see the template as rendered by HTML before it's converted into a PDF. I need to do this to see what CSS classes are being applied where, and because testing changes to the HTML and CSS layout is much easier in HTML and CSS using inspect element tools than constantly re-generating PDFs.
How can I see a Commerce Billy PDF template as it is rendered as HTML before it is passed to the PDF generator? Right now, I'm just guessing about how the rendered PDF will look when I make changes, then repeatedly re-rendering PDFs, which is an inefficient way of working. I'd like to be able to try different CSS changes using developer tools in a browser, then apply those changes to a file and check they apply cleanly, then generate test PDFs.