I have extracted common placeholders from the Litmus free templates and I have adjusted for my drag n drop features.
It works as I have expected, but I think it needs verifying the seems be working template and the templates gave question how I can be constrain the user behaviors against breaking the designed template. However, it is time to jump over next step, so I wrap it up and focus on my schedule.
for next scheduling, I would like to finish properties panel, bring it to Electron desktop app, and finally extract the email to a file.
I’m attaching the screen shot for the responsive design.