Feature request: highlight active font in Element Styles

[Ben Edmonds]

It would be nice to see what font is actually being rendered when multiple fonts are specified with CSS font-family. In the example below, it is likely that I'll be seeing Roboto and not the preferential Apple & MS fonts as I'm on a Chromebook, but finding that out definitively takes a fair bit more effort or a browser extension. 

Other CSS values are shown as overriden with strikethrough. However, this is typically the whole declaration rather than individual comma separated values within a multiple value set.