I'd like to think that the more often I create and edit ebooks, the less I have to ask for help here... but really, I think I'm just kidding myself. Hello again!

This week's tiny adventure is trying to insert a "thin space" separator between nested quotation marks, so that

would look something more like

From what I can find online, I think the special character code I need to use is " ",but every time I insert this into Sigil [version 0.3.0] and save the file, it promptly reverts back to a normal space (equivalent of   ). Am I using the wrong entity code here, or does Sigil simply not recognize it?