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Could rssowl use xhtmlrenderer (https://xhtmlrenderer.dev.java.net/) for displaying feeds?
" a 100% Java library for embedding rich XHTML and CSS content in desktop applications. It currently supports most of CSS2.1 including tables, forms, the box model (borders, backgrounds, padding, margins), lists, advanced selectors, images, and text formatting (fonts, italics, vertical alignment, etc.)."
Nice idea, but XHTMLRenderer seems to use AWT/Swing to render HTML. RSSOwl is using native SWT, I would not very much like to have AWT/Swing display render the HTML.
Did you find out about the internal browser that renders HTML if activated? Just press Ctrl+B or select it from the "Window" menu.