The thing that constantly frustrates me is being unable to return to a previous state without using undo. In the OP, for example, create a table, go to a cell,

The thing that constantly frustrates me is being unable to return to a previous state without using undo. In the OP, for example, create a table, go to a cell, press return (creating a second line), and then press delete. You're basically left with a p inside a td, when before there wasn't one. I feel like if you press a key and then press delete, you should go back to the exact state you were in before (or maybe after pressing delete twice). Another thing that bugs me is when elements that should be rejoined after a split are not rejoined. For instance, if you inadvertently split a ul in two by hitting return one too many times, and then you press delete, with many editors you will now have two ul elements (and potentially weird spacing in the middle of the list in the final rendering). Another example: removing and then re-adding italics to a paragraph that had been 100% italics before the edit. Before, you had one i element, but now you might have three. I've seen some editors handle these cases some of the time, but I haven't found one that handles them 100% of the time. In terms of features, I have always looked for the ability to visually edit Bootstrap or Foundation columns. It would be great to be able to add column systems to an editable space, and then re-size them, or even nest them.