Comment by lmm

One of these days I'll actually try writing a React-style (well, really Wicket-style) UI framework where styling is always inline - no cascades, no stylesheets, no selectors, just style attributes. If you want to reuse styling, you do it the same way as reusing markup, by having libraries of components.

With transparent compression it shouldn't make pages any bigger on the wire, and given that the browser always has to figure out what styling to apply to each element it shouldn't use any more memory.