The fact that there are two distinct disciplines begs the question how do you integrate the two?
This has proven a difficult problem to solve, and has resulted in the development of technologies such as JSTL (Java Standard Tag Library), frameworks and completely different architectures for web applications.
What these technologies aim to do is separate business logic from presentation, so that a programmer can control the logic independently of the web designer, and vice versa.
Using these technologies a programmer can create re-usable components, such as tags, which a web developer can simply drop into a web page wherever they need them. For example a tag may render a drop down list of values derived from a database. The designer does not see or need to know how this tag works, all he needs to know is how to use it.
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