leave my code structure alone!

That's a "no", but not (quite) for the reason you cite. The editor just feeds your HTML source to the browser. The browser then interprets it, and spits it back out to the editor when you go to save changes. So things like hex RGB get turned into RGB triplets (because the browser never represents RGB as hex internally), and your attribute order may change (based on the browser's JavaScript object attribute order), and you may get extra styles in your style attributes (because the browser automatically explicitly sets them), and your spacing might change (because the editor doesn't remember your indent style).