Really amazing work. +1 on all of these, especially full background coloring, completeness of children, and more contrast on left-hand children indicator. Hav

Really amazing work. +1 on all of these, especially full background coloring, completeness of children, and more contrast on left-hand children indicator. Having filled out a bunch of these, I second the idea that the knowledge level of a node should be the sum of its leaves. I "know" CSS, but I don't know certain tiny details of CSS. Showing completeness of knowledge as a percentage would be much more interesting to me. As an alternative to having to save everything yourself, an import/export as text or json would be great and allow transfer, backup, and third-party tools.