Editor is missing not even half the functionality as the one in the web browser. You can't even add a heading or set the font size. The only way to do it is by going to the HTML editor and add a tag that way. The only good thing about this is being able to manage posts  pages and comments (move or remove them). If you want to edit posts or page on your phone or tablet  you're better to do it another one and copy + paste it in using the web browser admin panel.
February 22 2017