We take great care to not modify the code that you import into Blocks Edit. Here is how your template code is handled as you build emails from it:
In the visual template editor, we add only editable tags to your code, the same way you would do manually within your code
As modules are dropped in, the code for them is put in as if you were doing it manually in the code yourself
Content edits are isolated from the structural code and their inline styling properties are kept as changes are made, including for images and links
The only thing that may get modified in your code are some hex code color values which your browser will automatically convert to RGB values while you’re in edit mode
Exporting your email code removes any editable tags
Note: while in edit mode, certain browser plugins may make changes to your code that get saved with it. If you have any plugins that visually affect the email you're working on, make sure to disbale the plugin while editing.