I am faced with the following question alot:

"Can you edit our site? Can you add a certain element?"

Sure i can - i use Webflow. :)

But i have to rebuild lots of elements and styles before being able to create the element i want to add.

If i embed code from the existing site and pull their CSS file... Webflow could display the site as it should look, without giving me the possibility to edit these styles. This would make it possible to create single elements to add to an existing project. (From an external company or developer even).