Should I teach modern web development in an introductory programming course? How? I'm currently teaching a introductory programming class in a technological university course (FYI, this is a type of university course that is not a BS).

The recommended language to use for this class is C and I'm following this guideline, but I know that most of the students will work as web developers at the end of the course (some of them already works as client support in IT companies), so I want to introduce them to some modern web concepts, but I don't know how.

They will have other classes during the course on other important subjects for web development (like computer networks and software engineering), but won't have any class that teaches modern programming languages for web, like Javascript.

Is this introductory programming class a good point to introduce some modern web development concepts (maybe with some Javascript snippets together with the C examples for comparison), or would this approach confuse them more than help them?
If you want to teach students programming concepts along with web-development (HTML/CSS/JS) you should consider lacing programming examples or lessons with examples of HTML/CSS/JS or similar concepts in both. You could also have HTML/CSS/JS as an extra credit assignment or something the class can do if they're ahead of schedule. This will keep the class motivated to learn HTML/CSS/JS, which you probably shouldn't grade as it's an extra addition to the curriculum. This will teach the class the necessary topics along with them not being bored out of their mind, studying for programming AND web development.