I just did the kana Sort-It! for Lesson 1.8 which is the first lesson to offer characters in color (は and が are red and blue). For the statements with colored characters, the different HTML tags and bits of the tags show up to be arranged along with the Japanese words themselves. When only sorting the words, the answer comes up as incorrect and “hard” lights up.
I know a little HTML, so I guess I could have managed an “easy," but… :-)
Thanks. I do like those features, though--both the colored (and sometimes just bolded) text, as well as the Sort It!