Which of the following best explains the difference between "syntax" and "semantics"?

The correct answer provides an understanding of how syntax relates to the correctness of code. Syntax refers to the set of rules and structure that define how code should be written in a particular programming or markup language. When the syntax is incorrect, it can lead to errors that prevent a browser from understanding the code, resulting in a failure to render the page properly. Essentially, if the syntactical rules of a language are not followed, the browser cannot interpret the instructions, leading to a malfunction in displaying the content.

In contrast, semantics relate to the meaning and purpose of the code. Even if the syntax is correct, if the semantics are not aligned with the desired function or user interaction, it could still lead to an output that does not behave as expected, but the browser would still be able to display the page. The choice indicating that syntax and semantics are interchangeable is inaccurate, as they refer to distinct concepts within programming and web development.