Yes but can that code be portable as a compliment you can embed multiple times in a web page? Separation of concerns is not the same as separation of technolog

Yes but can that code be portable as a compliment you can embed multiple times in a web page? Separation of concerns is not the same as separation of technologies. Putting JS, CSS, and HTML into separate files isn't necessarily separation of concerns, you're just separating tightly coupled code in different languages into multiple files.