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I am afraid there is not such a thing as an editor that automatically render across all platforms yet
Once you create a template (or even marketo templates), You still need to test it in all clients.
In the email world, there are no established standards for rendering or displaying email. This means email services (such as Hotmail and Yahoo!) , email clients (like Outlook and Apple Mail) each have their own unique way of handling the HTML used to render an email.
same thing applies to mobile devices & versions,