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I've similarly only been using the tool a few minutes, but this specific example - adding an extra row without doing any extra, manual work - seems to be eminently possible with Easel (as does automatic resizing on adding/removing rows) - the magic is Bootstrap behind the scenes, but it certainly works!

Hint: try creating a page using the 'Home' template and messing with the rows/columns in the centre to get a feel for it (though it seems to work on the blank canvas, too).

Have you checked out https://webflow.com? Easily passes that simple test. (I'm one of the founders.)

Hey there do you know any open source tools that come close to what you are doing with in-browser editing? There must be something on GitHub that makes it so you can easily style elements on a page and absorb the CSS you added.

Another tool: rukzuk (https://rukzuk.com/en/)