Developing UI components based on ContentEditable is trial and error, with a lot of code held together by cross-browser integration tests where you always have

Developing UI components based on ContentEditable is trial and error, with a lot of code held together by cross-browser integration tests where you always have to pray that a browser upgrade doesn't brake something new in a subtle and surprising way... 1/5, would not recommend. (But sometimes there's no way around it.)